COS DE BAHA Tranexamic Serum 60ml

Values checked: 100% Genuine (Adilsons policy) · FA-Safe (INCI cross-checked, no Malassezia-feeding esters detected) · Fragrance-Free (confirmed, no Parfum/Fragrance in the declared INCI) · Halal-Friendly* / Vegan-Friendly* (self-assessed, see Section 26 for the footnote).

If you've spent months trying to fade a stubborn dark patch and it just fades a little then plateaus, that plateau is real — most brightening actives slow down after the first visible improvement, not because they've stopped working but because melanin clearance has its own turnover speed. This is a normal part of the process, not a sign the product has failed.

PIH vs PIE: this product targets PIH (post-inflammatory hyperpigmentation) — brown or dark marks caused by excess melanin, which respond to niacinamide, tranexamic acid, Vitamin C and arbutin. It does not address PIE (post-inflammatory erythema) — the pink or red marks left by damaged capillaries, which need centella asiatica, azelaic acid, and time instead.

Pros: dual-mechanism brightening (TXA + niacinamide) rather than a single active; lightweight, fast-absorbing gel texture; fragrance-free and low on the irritation scale for a 5%-actives serum; layers cleanly under sunscreen and makeup. Caveats: the brand's own product page warns its concentrated actives can cause an allergic reaction or burning sensation in sensitive skin and recommends a patch test; pH is not publicly disclosed; results take weeks, not days, and daily sunscreen is non-negotiable or the pigment simply returns.

Classification: YELLOW (14+, with guidance). Tranexamic Acid 5% and Niacinamide 5% are not on the pediatric red-flag list (AHAs, BHAs, retinoids, benzoyl peroxide, high-dose Vitamin C, or chemical exfoliants), and this is not youth-marketed packaging. But hyperpigmentation correction targets adult-pattern melasma and post-acne marks — biological processes tied to years of sun exposure and hormonal fluctuation that prepubescent and early-teen skin has not yet accumulated, so there is rarely a real need for it under 14.

For a teenager dealing with genuine post-acne dark marks, this product is not dangerous, but a parent should supervise the patch test given the brand's own burning/allergic-reaction caution. If the concern is active breakouts rather than the marks they leave behind, a gentler starting point makes more sense — the COS DE BAHA Niacinamide 10 Serum alone, without added tranexamic acid, is a reasonable age-appropriate step before introducing a dual-active formula.

Compatibility checklist: bedside-compatible (no sink needed) — yes; requires rinsing — no; requires precise dosage — no, a few drops is forgiving; usable with unwashed hands in a pinch — yes, though hands should ideally be clean; requires wait time — a short 30-60 second absorption pause before moisturizer, nothing elaborate.

Minimum viable routine: this serum qualifies for a bare-bones 3-product routine (cleanser, this serum, moisturizer with SPF in the morning) on days when a full 10-step routine isn't happening. It has no strong scent and a light, non-greasy finish, so it doesn't carry the sensory aversion risk of heavier balms or strongly fragranced treatments on low-tolerance days.

Step 1 — When: Morning or evening, or both once your skin tolerates it well. Step 2 — How much: 2-3 drops or one pump, applied to a clean, slightly damp face. Step 3 — How: pat or press into skin (don't rub), wait 30-60 seconds, then follow with moisturizer — and SPF if it's daytime.

Introduce this as the ONLY new product in your routine. Wait a full 14 days before adding anything else. This isolation window ensures you can identify whether any reaction is caused by this specific product.

1) Gentle cleanser (optional if skin is clean from overnight) → 2) Hydrating toner (optional) → 3) COS DE BAHA Tranexamic Serum (2-3 drops, pat in, wait 30-60 seconds) → 4) Moisturizer → 5) Sunscreen SPF50+ PA++++ (2-finger rule). In Mauritius' morning humidity, humectant layers underneath this serum (hyaluronic acid toners, glycerin-based essences) perform especially well because they pull water from the humid air itself rather than drawing it from deeper skin layers.

This product is not photosensitizing on its own, but pigmentation-correcting actives make already-present dark spots more visible to UV if sunscreen is skipped — the single most common reason a brightening serum "doesn't work" is inconsistent SPF, not the serum itself.

1) Double cleanse if wearing sunscreen/makeup → 2) Hydrating toner (optional) → 3) COS DE BAHA Tranexamic Serum (2-3 drops, pat in, wait 30-60 seconds) → 4) A separate active only if it's a different pathway (e.g. a soothing centella serum, not another brightening acid) → 5) Moisturizer. Because tranexamic acid and niacinamide don't occupy the same "lane" as retinoids or exfoliating acids, this serum can generally sit in the same nightly routine as either — it doesn't compete chemically the way two acids or two retinoids would.

If you're skin cycling with the COS DE BAHA Retinol Serum or AHA/BHA GS Toner from the same line, this Tranexamic Serum can run on every night of the cycle (including recovery nights) since it isn't itself an exfoliant or a retinoid — it simply doesn't need a rest day the way those actives do.

Technique: pat or press the serum in rather than rubbing — friction can degrade some formulas and increases irritation risk, especially with active ingredients. Required skin state: clean, slightly damp skin helps the watery gel spread evenly. Wait time: 30-60 seconds before the next layer is enough for a niacinamide/TXA serum — it doesn't need the longer 10-20 minute wait that pH-dependent acid exfoliants require.

Hands deliver 100% of product. Cotton pads absorb approximately 30-40%. Use hands unless applying as an exfoliant swipe (not applicable to this product).

This is an encyclopedia map of all product types. You do not use all of these daily. You select modules based on your skin state.

Global execution rules: viscosity ladder runs thinnest to thickest, water-phase before oil-phase, treatments before seals. Wait-time defaults: watery layers 10-20 seconds; serum layers 30-60 seconds; before sunscreen, 10-15 minutes if going outdoors or applying makeup. Amount defaults: watery toner/essence 5-8 drops per layer; serum/ampoule 2-3 drops or 1 pump (+1 drop for neck); eye product ½ rice-grain per eye; gel moisturizer 1-1.5 peas, cream 1-2 peas; occlusive seal rice-grain to pea-size; sunscreen 2-finger rule for face, +1 finger for neck. Hydrators sit best on slightly damp skin; retinoids prefer fully dry skin; exfoliating acids depend on your irritation tolerance — keep to one lane regardless. If the routine pills, stings, or feels heavy, reduce layers, not increase.

AM Maximum Stack: 1) Rinse/gentle cleanse (optional) → 2) pH-prep toner (optional) → 3) Hydrating toner layers (optional, 1-3) → 4) Essence (optional) → 5) Mist (optional) → 6) Booster/soothing serum (optional) → 7) Antioxidant lane, pick one (Vitamin C or a gentler antioxidant) → 8) Pigment support lane, pick one — this is where the Tranexamic Serum sits → 9) Hydration serum lane (optional) → 10) Oil-control/sebum lane (optional) → 11) Peptide/repair lane (optional) → 12) Eye product (optional) → 13) Moisturizer → 14) Optional sealing layer (only if dry/AC) → 15) Sunscreen SPF50+ PA++++ (non-negotiable) → 16) Lip SPF (optional). In AM, prioritize comfort and SPF adherence over stacking — in high humidity, fewer layers often perform better.

PM Maximum Stack: 1) Micellar pre-cleanse (optional) → 2) Oil cleanser/balm (if SPF/makeup) → 3) Water cleanser → 4) pH-prep toner (optional) → 5) Hydrating toner layers (optional) → 6) Essence (optional) → 7) Soothing/barrier serum (optional) → 8) Anchor product (retinoid, acid, or — on nights it's not paired with those — this pigment-support serum) → 9) Targeted serum (optional, only if non-conflicting) → 10) Moisturizer → 11) Sleeping mask (optional) → 12) Occlusive seal (optional) → 13) Spot treatment (as needed) → 14) Lip sleeping mask (optional). Do not layer retinoids with AHA/BHA in the same night; keep "one lane" per night.

Lane strictness: One-lane rule — Retinoid OR Exfoliation OR Strong Vitamin C (LAA) OR Acne-control active per routine; barrier/hydration can always accompany. If unsure, default to the safest lane (barrier/hydration) and reduce layers.

This serum sits at the water-thin to light-fluid rung of the viscosity ladder — apply it after any watery toner or essence, and before your moisturizer or any thicker treatment. The general layering rule is thinnest to thickest, water-phase before oil-phase, so this belongs early in either routine.

Phase compatibility: this is a water-phase, aloe-and-glycerin-based gel with no oil or silicone content declared in the INCI, so it layers cleanly under both water-based and oil-based moisturizers without separating or pilling on its own.

Rest days: this product itself does not require rest days — niacinamide and tranexamic acid don't accelerate cell turnover the way retinoids or acids do, so it can safely be used daily, twice a day. The rest-day logic in the table above belongs to whichever exfoliant or retinoid you might be running alongside it, not to this serum.

Overuse warning: using more than the recommended 2-3 drops per application does not speed up pigment fading — it produces sticky buildup and wastes product. Exceeding a sensible frequency does not produce faster results, it produces irritation.

Before starting this product, your routine MUST already include a daily sunscreen habit and a working moisturizer. Without SPF specifically, brightening actives are fighting a losing battle — new UV exposure re-triggers the exact melanin pathway this serum is trying to calm.

Graduation ladder: for a genuinely gentle entry point, the SKIN1004 Madagascar Centella Tone Brightening Capsule Ampoule (Niacinamide 4% + Tranexamic Acid 2%, verified active and in stock) sits a step below this product's 5%/5% combination. There is currently no higher-percentage tranexamic acid product in the Adilsons catalog to step up to from here.

If your skin stings on moisturizer, feels tight within 30 minutes of cleansing, or shows visible flaking, your barrier is below threshold — start with a soothing product like the SKIN1004 Madagascar Centella Ampoule first, verified active and in stock.

Fitzpatrick context: for Fitzpatrick Types IV-VI, hyperpigmentation and PIH tend to be darker and more persistent, but skin in this range is also more prone to a rebound darkening if actives are introduced too aggressively or without sunscreen. Start at a lower frequency (every other day) for the first two weeks regardless of skin type, then increase if tolerated.

Primary targets: Hyperpigmentation and melasma-pattern discoloration — tranexamic acid interrupts the plasmin-driven signaling that overstimulates melanocytes, while niacinamide separately blocks the transfer of melanin granules from melanocytes into surface skin cells. Together they attack two different points in the same pigment-production chain rather than one.

PIH vs PIE: this product addresses PIH (brown/dark marks from excess melanin) and does not meaningfully address PIE (red/pink marks from capillary damage) — see the At-a-Glance section above for the full distinction.

Secondary benefits: niacinamide also supports barrier function and can modestly reduce the look of enlarged pores over consistent use. What this product cannot do: it cannot physically shrink pores, cannot lift sagging skin, and cannot lighten your natural skin tone — brightening here means fading excess pigment back toward your own baseline complexion, not changing what that baseline is.

1. Sunscreen (mandatory, not optional) — Beauty of Joseon Relief Sun: Rice + Probiotics SPF50+ PA++++ (primary; verified active, 45 in stock). Alternatives: SKIN1004 Madagascar Centella Tone Brightening Tone-Up Sunscreen (28 in stock), Anua Heartleaf Silky Moisture Sun Cream (23 in stock), or the mineral-filter SKIN1004 Madagascar Centella Air-Fit Suncream Light (12 in stock, physical/zinc-oxide filter for sensitive skin). Synergy: brightening actives only hold their gains if new UV-triggered pigment is blocked daily.

2. Barrier/soothing support — Beauty of Joseon Calming Serum: Green Tea + Panthenol (11 in stock). Use it on nights the Tranexamic Serum feels slightly tight or if you're introducing it alongside an exfoliant. AM or PM, applied before the Tranexamic Serum on sensitized days.

3. Gentle, low-pH cleanser — Beauty of Joseon Green Plum Refreshing Cleanser (pH ~5.5, 4 in stock). A cleanser that doesn't strip the acid mantle keeps the skin barrier in the state actives need to be tolerated well.

4. Moisturizer to seal it in — Anua Birch Moisture Boosting Cream (9 in stock, gel-cream texture suited to humid climates).

Pilling pairs: layering this serum under multiple other watery serums (three or more toner/essence layers) before it can cause light pilling under sunscreen; keep pre-serum toner layers to one or two, pat dry between layers, and wait the full 30-60 seconds before the next step.

Water-Permeable (wudu-compatible). This is a watery, non-occlusive gel serum with no waxes, silicones, or film-forming polymers declared in the INCI, so water reaches the skin surface normally during ablution.

Adilsons provides this assessment based on the product's physical properties. Rulings on wudu validity vary between scholars. Consult your own trusted Islamic authority.

MYTH: "Dark spots need a bleaching agent like hydroquinone to actually fade." REALITY: tranexamic acid and niacinamide work through entirely different, non-bleaching mechanisms — they reduce excess melanin production and transfer rather than chemically bleaching existing pigment, and are considered gentler long-term options in many markets.

MYTH: "Tranexamic acid is a blood-clotting medication, so it's dangerous to put on skin." REALITY: tranexamic acid is used both as an oral/IV medication at medical doses for bleeding control and, separately, as a topical skincare ingredient at a much lower concentration (5% here) applied to intact skin — the two uses are not interchangeable, and topical use does not carry the same risk profile as the medical dose.

MYTH: "A higher percentage always fades spots faster." REALITY: consistency and daily SPF matter far more than raw percentage — a 5% tranexamic acid serum used every day with sunscreen will outperform a stronger formula used inconsistently or without sun protection.

Sugar cane burning season (July-November): PM2.5 particulate increases during this period. Because reviewers describe this serum's finish as slightly sticky, consider shifting it to a PM-only step during peak burning weeks so daytime particulate has less to adhere to.

Hard water note: Mauritius tap water hardness varies by region; hard water can leave a mild calcium-stearate film after cleansing that reads as tightness. Following your cleanser with a pH-balancing toner before this serum helps counteract that residue rather than layering the serum onto a slightly alkaline surface.

Full INCI list (brand listing and Amazon retailer listing, cross-checked against independent ingredient-database search summaries — see the honesty note below): Aloe Barbadensis Leaf Extract, Tranexamic Acid, Niacinamide, Glycereth-26, Betaine, Propanediol, 1,2-Hexanediol, [--- Estimated 1% Line ---] Sodium Hyaluronate, Allantoin, Xanthan Gum, Citric Acid, Camellia Sinensis Leaf Extract, Sambucus Nigra Flower Extract, Momordica Charantia Fruit Extract, Leontopodium Alpinum Extract.

The estimated 1% line placement is based on standard INCI-ordering convention (descending concentration), not a lab assay — 1,2-Hexanediol is typically used well under 1% as a preservative-boosting solvent, so everything listed after it is estimated to fall below that line.

The four trailing botanical extracts (Camellia Sinensis/green tea, Sambucus Nigra/elderflower, Momordica Charantia/bitter melon, Leontopodium Alpinum/edelweiss) are marketed by the brand as a "natural herb extract" complex. This ingredient appears below the estimated 1% line in the INCI list, suggesting it is present at a trace/sub-efficacious concentration. Its inclusion may be primarily for marketing rather than clinical effect.

Preservative system: 1,2-Hexanediol functions as a preservative-boosting solvent (a common alternative/adjunct to traditional parabens in Korean formulations); no other dedicated preservative is declared in the list found for this product.

Fragrance status: Fragrance-Free — no Parfum, Fragrance, or essential oil is declared in the INCI found for this product. Scent: based on the ingredient profile, expect little to no detectable scent beyond a faint herbal note from the trace botanical extracts.

EU 26 allergen screen: none of the 26 EU-regulated fragrance allergens were detected in the declared INCI for this product. Alcohol disclosure: Alcohol-Free — no denatured or drying alcohol appears in the ingredient list.

Halal: *Self-assessed by Adilsons based on available INCI data. No ethanol from fermentation, no porcine-derived ingredients, and no haram animal-derived ingredients detected in the declared ingredient list. This is NOT a formal Halal certification. Muslims with stricter requirements should consult their own scholars.

Vegan: *Self-assessed by Adilsons based on available INCI data. No animal-derived ingredients detected. This is NOT a formal vegan certification by The Vegan Society or equivalent body.

Cruelty-Free: *Brand-stated policy. Not independently certified by Leaping Bunny, PETA, or equivalent third-party audit. Whether COS DE BAHA sells through Mainland China retail (which can carry post-market animal-testing requirements) was not confirmed either way in this research pass.

Microplastic-Free: Yes — no polymer microbead or film-forming plastic ingredient was found in the declared INCI (Xanthan Gum is a natural polysaccharide thickener, not a microplastic).

MFDS classification: Niacinamide and tranexamic acid are both ingredient classes recognized under Korea's MFDS "functional cosmetic" (whitening/미백) framework at appropriate concentrations, but no evidence was found that this specific 60ml SKU carries its own MFDS functional-cosmetic filing — treat it as a General Cosmetic unless a specific registration surfaces. "Functional" status in Korea means the product underwent additional government efficacy/safety testing beyond baseline cosmetic rules; it is a real regulatory distinction, not marketing language, when genuinely held.

Whitening translation: the Korean "미백" (mibaek) classification refers to regulation of melanin production — fading dark spots toward your natural tone. It does NOT mean bleaching or changing your natural complexion.

Clinical evidence: tranexamic acid and niacinamide both have a substantial body of published dermatology literature supporting their mechanism for hyperpigmentation in general, but no brand-run clinical study specific to this exact 60ml/5% formulation was found. *Evidence confidence for this specific SKU: Marketing-Only for the branded "natural herb extract" claim; Moderate-to-Strong for the core Tranexamic Acid + Niacinamide combination based on general ingredient-class research, not a study of this product itself.

FA safety: FA-Safe. None of the declared ingredients (no Polysorbates, no fatty-acid esters, no problematic fatty alcohols) are known Malassezia-feeding compounds based on a cross-reference against standard fungal-acne ingredient screening lists.

Assessment: Low. As a simple watery gel with no heavy film-formers, this serum rarely pills on its own — the main pilling risk comes from stacking it under too many other watery layers before it (three or more toner/essence steps) rather than from the serum itself.

Mitigation: apply to slightly damp (not soaking) skin, wait the full 30-60 seconds before your next layer, and pat rather than rub it in.

Color baseline: expect a clear-to-slightly-translucent gel; a noticeable yellowing or browning, or a sudden change in smell, are signs of oxidation or spoilage rather than normal variation. Oxidized actives can generate free radicals rather than fighting them, so discard rather than continue using a product that has visibly changed.

Storage: keep out of direct sun and away from bathroom humidity where possible — a bedroom drawer or cabinet holds a more stable temperature than a steamy bathroom shelf in Mauritius' climate. Spoilage signs: color change, separation that doesn't remix, an off or sour smell, or a change in texture. When in doubt, discard.

Patch test: apply a small amount to your inner forearm, wait 24 hours, then test behind the ear for another 24 hours before applying to the full face — this two-site test matters more here than usual given the brand's own stated risk of allergic reaction or burning in sensitive users.

72-hour barrier reset: if you experience an adverse reaction, STOP ALL ACTIVES. For 72 hours, use ONLY gentle cleanser, plain moisturizer, and mineral SPF — no acids, retinoids, Vitamin C, exfoliants, or essential oils. After 72 hours, reintroduce ONE product per 14 days.

Emergency stop signals: hives, swelling, blistering, persistent burning, or breathing difficulty — seek emergency care immediately and discontinue use.

1) Skipping sunscreen — this single mistake undoes more brightening progress than any formula choice. 2) Expecting results within days rather than weeks — pigment correction runs on the skin's own turnover cycle. 3) Applying too much product hoping for faster results — excess serum just sits on the surface and feels sticky without fading spots any faster.

4) Introducing it alongside multiple other new actives at once, making it impossible to identify what caused an irritation if one occurs. 5) Rubbing it in vigorously instead of patting — friction increases irritation risk without improving absorption.

Overuse threshold: using it more than twice daily does not accelerate fading; it increases irritation risk without any added benefit.

Usage math: at roughly 2-3 drops (about 0.5-0.75ml estimated) per application, a 60ml bottle used twice daily works out to approximately 40-60 applications, or roughly 20-30 days of full twice-daily use at the higher end of that estimate — though many users apply it once daily at first, which stretches this considerably further.

Lifespan and reorder: using 2-3x the recommended amount per application does not improve results and simply shortens how long the bottle lasts. Because pigment correction is a multi-month process, plan to reorder before this runs out rather than pausing mid-routine — check your PAO symbol for the maximum months after opening it remains usable.

If your goal is fading a specific dark patch rather than general glow, this serum's job is narrow and specific: reduce the melanin signal at its source, twice daily, while sunscreen prevents new signal from forming. It sits at the water-thin "pigment support lane" position — after toner/essence, before moisturizer.

AM: Cleanser (optional) → Toner (optional) → Tranexamic Serum (2-3 drops, pat, wait 30-60s) → Moisturizer → Sunscreen. PM: Double cleanse → Toner (optional) → Tranexamic Serum → Moisturizer.

If your skin is barrier-compromised right now (stinging on moisturizer, visible flaking): pause this serum and run the 72-Hour Barrier Reset first, then reintroduce at every-other-day frequency. If you are in AC all day: seal this serum with a slightly richer moisturizer than you'd use in outdoor humidity, since AC air pulls moisture out rather than in. If you're also using the COS DE BAHA Retinol Serum or AHA/BHA GS Toner: this Tranexamic Serum doesn't need its own rest nights, so it can run every night while the retinoid or acid alternates per its own schedule.

Stock-true bundle — Brightening Basics: this Tranexamic Serum + Beauty of Joseon Relief Sun SPF50+ + Anua Birch Moisture Boosting Cream — a three-piece routine covering the serum's active mechanism, the SPF that protects its gains, and the moisturizer that seals it in.

Stock-true bundle — Sensitive-Skin Introduction: Beauty of Joseon Green Plum Refreshing Cleanser + Beauty of Joseon Calming Serum + this Tranexamic Serum — a lower-pH cleanse and a soothing buffer serum ahead of the actives, useful given the brand's own sensitivity caution.

After purchasing, you will receive our skincare education email series covering this product in depth.

The recommendations above are based on formulation synergy with COS DE BAHA Tranexamic Serum, not on margin or stock levels. If a pairing does not exist in our catalog, we say so. If you already own a product that fills the same role, use what you have first.

If you want a gentler entry point at a lower combined active percentage, the SKIN1004 Madagascar Centella Tone Brightening Capsule Ampoule (Niacinamide 4% + Tranexamic Acid 2%, verified active, 150 in stock) delivers the same dual-mechanism approach at roughly half the strength, in a centella-forward base that leans more soothing. If you want a stronger niacinamide dose alongside tranexamic acid, the Anua Niacinamide 10% + TXA 4% Dark Spot Correcting Serum (verified active, 51 in stock) trades a slightly lower tranexamic acid concentration for double the niacinamide.

Choose COS DE BAHA Tranexamic Serum over the SKIN1004 or Anua alternatives if you need: the highest tranexamic acid concentration currently stocked (5%, versus 2% or 4%) paired with an equally matched 5% niacinamide dose — a balanced, symmetric dual-active approach rather than one ingredient dominating the other.

Upgrade if: you've already tolerated a lower-percentage TXA/niacinamide product without irritation and plateaued on results → this is a reasonable next step up. Upgrade if: you have a barrier-intact, SPF-consistent routine and want a single serum covering two brightening pathways rather than juggling separate niacinamide and TXA products.

Do not upgrade yet if: your barrier is currently compromised — repair it first, regardless of which product you eventually choose. Do not upgrade if: you're new to actives entirely — the gentler SKIN1004 ampoule is the more sensible starting point. Do not upgrade if: you already own the Anua Niacinamide 10%+TXA 4% Serum — running both is redundant, not additive.

If you match two or more upgrade triggers above, this is worth choosing. If not, the gentler alternative is sufficient and safer. Consistency beats complexity.

A sensible ladder within the current Adilsons catalog runs: SKIN1004 Centella Tone Brightening Capsule Ampoule (2% TXA / 4% Niacinamide, gentlest entry) → this COS DE BAHA Tranexamic Serum (5% TXA / 5% Niacinamide, the balanced middle step) → no further step-up is currently stocked at a higher tranexamic acid percentage. If you outgrow this product's results, the next reasonable move is a dermatologist consultation for prescription-strength options rather than an over-the-counter increase.

This product's PRIMARY function is: dual-mechanism pigment correction (Tranexamic Acid + Niacinamide). You do NOT need this if you already own a dedicated niacinamide serum you're happy with and aren't specifically chasing tranexamic acid's added mechanism — for example, the COS DE BAHA Niacinamide 10 Serum already covers the niacinamide half at a higher percentage on its own.

Inventory audit: check whether you already have an open tranexamic acid or dedicated brightening serum before buying a second one — finish what you have first, since PAO timelines mean an unopened backup can expire before an in-use bottle is finished. Stacking assessment: pairing this with the COS DE BAHA Azelaic Acid 5% Serum offers Significant Benefit (different pathway, PIE/redness coverage this product doesn't provide); pairing it with a separate standalone niacinamide serum offers only Marginal Benefit, since niacinamide is already built in here at 5%.

This product is sourced through authorized Korean distributors — primarily Craver Co., Ltd (South Korea), alongside other verified distribution partners. Craver is a major Korean beauty distributor and the parent company of SKIN1004, handling authorized distribution for multiple K-beauty brands. All products are shipped directly to Mauritius via verified channels.

For comprehensive information about how we verify authenticity, our layered verification system, and how to check your product at home, visit our dedicated Authenticity and Trust page.

Quick verification tips: genuine COS DE BAHA packaging carries the full ingredient list and net volume in both English and Korean on the box; the pump/dropper mechanism should feel securely seated with no rattling. If anything about your unit looks inconsistent with these general markers, check the Authenticity page above for the full verification process.

Brand: COS DE BAHA, operated by JAINA Co., Ltd (CEO Junwon Lee), founded 2019, headquartered in Suwon, South Korea. Products are made in South Korean laboratories described by the brand as MFDS-certified and operated by a contract manufacturer with over 30 years of industry experience — no single named ODM/OEM factory was confirmed in available research.

COS DE BAHA positions itself as a value/high-potency actives brand: single-active and combo-active serums sold at clearly labeled concentrations (Niacinamide 10%, Azelaic Acid 5%, Salicylic Acid 4%, and this Tranexamic Acid 5%/Niacinamide 5% combination among them) at more accessible price points than many prestige K-beauty actives lines. The brand's own product pages are notably direct about the strength of their formulas, including recommending patch tests for their higher-concentration serums.

A dedicated, individually-attributable review base for this exact 60ml/5%-and-5% listing was not found in this research pass — WebFetch (needed to read reviews pages directly) was blocked in this environment, so only search-engine summaries of iHerb, Amazon, and What's In My Jar coverage of Cos De BAHA's closely related tranexamic acid + niacinamide serums (including the sibling "TN" 30ml/60ml listings) could be checked. Rather than invent specific quotes, usernames, or platforms for this exact SKU, the themes below are reported honestly as aggregate patterns across that closely related coverage.

Common praise themes: perceived brightening and fading of dark spots/uneven tone starting around the two-week mark; a lightweight, fast-absorbing texture that layers well under sunscreen and makeup; several ingredient-analysis summaries described the formula as low-irritation despite the 5% active load.

Common complaint themes: inconsistent or slow results for more stubborn, melasma-pattern discoloration; a slightly sticky finish noted in some accounts; and the brand's own product-page caution about possible allergic reaction or burning in sensitive users, which functions as a standing manufacturer warning rather than a specific customer complaint.

Sustainability: check the bottle material (glass vs. plastic) printed on your unit for local recycling guidance; refill options were not found for this product.

Can I use this if I'm pregnant or breastfeeding? This product's ingredients aren't on the strict pregnancy-contraindicated list (no retinoids, no high-percentage salicylic acid, no hydroquinone), but genuine medical opinion is mixed on topical tranexamic acid specifically during pregnancy — some sources call it low-risk due to minimal skin absorption, while many dermatologists still recommend caution, especially in the first trimester. The honest answer is: talk to your doctor before starting this one if you're pregnant or nursing, rather than assuming either way.

Can I use this with Vitamin C or retinol? Yes — tranexamic acid and niacinamide don't occupy the same chemical "lane" as Vitamin C or retinoids, so this serum can generally be layered with either, typically Vitamin C in the AM and retinol in the PM, with this serum fitting into whichever routine feels right for you.

Will this get rid of melasma completely? No. Melasma is a chronic, relapsing condition driven by hormones, heat, and UV exposure — this serum can meaningfully fade the pigment that's already visible with consistent use and SPF, but it does not cure or permanently prevent melasma from returning if triggers persist.

Why does the brand warn about burning or allergic reaction? COS DE BAHA formulates its serums at clearly labeled, comparatively high active concentrations for the price point, and the brand is direct about recommending a patch test before full-face use — this is a genuine caution worth taking seriously, not boilerplate.

How long until I see results? Most users in aggregated reviews report early changes around two weeks, with more meaningful fading by four to eight weeks — pigment correction follows the skin's own turnover cycle and cannot be meaningfully sped up by using more product.

Tranexamic Acid (TXA)

A brightening ingredient that reduces a specific inflammatory signal (plasmin) which otherwise overstimulates pigment-producing cells.

Niacinamide

A form of Vitamin B3 that blocks the transfer of pigment granules into skin cells and supports the skin's barrier.

PIH

Post-inflammatory hyperpigmentation — brown or dark marks left behind after acne, injury, or irritation.

PIE

Post-inflammatory erythema — red or pink marks from damaged capillaries, a different problem from PIH.

MFDS

Korea's Ministry of Food and Drug Safety, the regulatory body that classifies cosmetics as General or Functional.

Fairy Dusting

When a marketed ingredient is included at such a low concentration it likely has little real effect — often near the bottom of an ingredient list.

Estimated 1% Line

The point in an ingredient list, based on ordering convention, below which ingredients are estimated to be under 1% concentration.

FA-Safe

Free of ingredients known to feed Malassezia yeast, which can trigger fungal acne in susceptible skin.

PAO

Period-After-Opening — the small jar-shaped icon on packaging showing how many months a product stays good once opened.

Every product sold by Adilsons Beauty is 100% genuine, sourced through authorized Korean distribution channels. Full details on our verification system: Authenticity and Trust.

Our team is available to help you build a routine, troubleshoot reactions, and answer ingredient questions. WhatsApp: +230 5 778 2336.

For in-depth skincare education, visit our blog at adilsons.mu/blogs/k-beauty or subscribe to our email to get our guided education series delivered to your inbox.

Coverage: Island-wide delivery (Mauritius).

Processing and Timing: Orders process in 1-2 business days; usually ready by Day 3 for pickup by our delivery partners/regional team. Partner collection can take up to 1 week. After pickup, delivery typically takes 1-5 business days (weekdays only).

Express: May be available by region; request on WhatsApp: +230 5 778 2336.

Liquids/Sensitive Items: Serums, toners, liquid makeup (and kits containing liquids) are pickup or door-to-door only; checkout enforces this.

Scheduling: Deliveries run by region on set schedules; we will contact you the evening before.

Pickup: Citadelle Mall pickup available.

Returns: No change-of-mind exchanges.

Refunds (Summary): For defective/damaged on receipt (report within 48h), wrong item, or manufacturing defect within 6 months. Refunds via bank transfer (7-10 business days); card refunds may incur a 5% processor fee (fee not charged for defects/order errors). Opened skincare/personal-care items are non-returnable (except if damaged on delivery).

Source of Truth: This is a quick snapshot. If anything differs, the policy pages are final.

Store Policies: For the most up-to-date information, please review our Shipping Policy and Refund Policy.

Best for: anyone dealing with stubborn brown or dark marks — post-acne pigmentation, sun-related uneven tone, or melasma-pattern discoloration — who already has a daily SPF habit and an intact skin barrier, and wants a dual-mechanism serum rather than a single-ingredient approach.

Key benefits: matched 5%/5% Tranexamic Acid and Niacinamide concentrations, the highest TXA percentage currently in the Adilsons catalog; fragrance-free, FA-safe, and low on comedogenic risk; lightweight texture suited to Mauritius humidity.

Keep in mind: pH is not publicly disclosed; the brand itself warns of possible allergic reaction or burning in sensitive skin, so the patch test is not optional; and results genuinely take four to eight weeks of consistent, SPF-backed use to become visible.

Assessment: Consult Oncologist. This formula is fragrance-free and retinoid-free, which are generally favorable traits for treatment-sensitized skin, but tranexamic acid and niacinamide at active percentages have not been specifically studied for safety during cancer treatment in the research available for this pass.

Consult your oncology care team before introducing any new skincare products during treatment.

Quick version:

• Week 1-2: introduce alone, once daily, and monitor for the brand's stated risk of burning/allergic reaction.
• Week 3-4: increase to twice daily if stable.
• Week 5+: layer in one supporting product (like a soothing serum) only if genuinely needed.
• If irritation appears at any point: refer to the 72-Hour Barrier Reset above rather than pushing through.

This product must be introduced as the ONLY new product. Wait 14 days before adding anything else.

Particulate adhesion: the mild tackiness some users report in humid conditions could allow airborne dust or PM2.5 (notably during the July-November sugar cane burning season) to adhere slightly more than a fully matte formula would — a quick rinse or micellar wipe at the end of a high-pollution day is a reasonable precaution.

Antioxidant pollution defense: Camellia Sinensis (green tea) Leaf Extract carries recognized antioxidant polyphenol content in the general ingredient literature, though it sits below this formula's estimated 1% line, so its real-world antioxidant contribution here is likely minor rather than a primary defense mechanism.

AC/humidity swing interaction: Sodium Hyaluronate is present but, based on its position in the INCI list, likely at a low concentration — in long air-conditioned stretches, seal this serum with a proper moisturizer rather than relying on it alone for hydration, since even trace humectants can pull moisture from deeper skin layers in very dry indoor air.