COS DE BAHA Arbutin+Niacinamide Serum 30ml

Values: 100% Genuine (Adilsons policy) · FA-Safe · Fragrance-Free (confirmed via INCI) · Vegan-Friendly* / Cruelty-Free* (brand-stated).

Pros: both actives at a real, brand-confirmed 5% concentration, targets a well-established pigmentation pathway, gentle enough for sensitive skin per community feedback. Caveats: results take 8-12+ weeks and fail without daily SPF; it treats brown/tan PIH, not red/pink PIE; contains several aromatic plant extracts (witch hazel, rosemary, eucalyptus, thyme) worth patch-testing if you're extract-sensitive.

Classification: YELLOW — 14+ with guidance. 5% Arbutin and 5% Niacinamide are moderate-strength, well-tolerated actives, but pigmentation correction is not a concern most under-16 skin has developed yet (PIH typically follows years of sun exposure or resolved acne). If a teen has genuine post-acne dark marks, this can be used under adult guidance; it is not necessary for skin with no pigmentation concern.

Bedside-compatible: yes. Requires rinsing: no. Requires precise dosage: no. Wait time: minimal. This is a reasonable core piece of a bare-bones routine on low-energy days, though its results depend on consistency more than most steps.

Step 1 (When): AM and/or PM. Step 2 (How much): 2-3 drops. Step 3 (How): pat in, wait 30-60 seconds before moisturizer; if used AM, sunscreen is mandatory afterward.

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. Cleanse. 2. Toner (optional). 3. COS DE BAHA Arbutin+Niacinamide Serum. 4. Moisturizer. 5. Sunscreen SPF50+ PA++++ (mandatory — pigmentation routines fail without daily SPF, since UV is what triggers the melanin production this serum slows). Humid Mauritius mornings suit this serum's lightweight texture well.

1. Double cleanse if wearing SPF/makeup. 2. Toner (optional). 3. COS DE BAHA Arbutin+Niacinamide Serum. 4. Any other non-conflicting active. 5. Moisturizer. This product is compatible on Recovery nights of a 4-night skin-cycling protocol and can also run on active nights since it doesn't compete with the retinoid/acid/LAA lanes.

Technique: pat/press, do not rub. Skin state: slightly damp is fine. Wait time: 30-60 seconds before moisturizer. Hands deliver 100% of product; cotton pads absorb approximately 30-40% — use hands.

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 rules: viscosity ladder thinnest to thickest, water-phase before oil-phase, treatments before seals. Wait-time defaults: watery layers 10-20s, serum layers 30-60s, 10-15 minutes before sunscreen if going outdoors. 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). 4. Essence (optional). 5. Mist (optional). 6. Booster/soothing serum (optional). 7. Antioxidant lane (choose one). 8. Pigment support lane — this product's role. 9. Hydration serum lane (optional). 10. Oil-control lane (optional). 11. Peptide/repair lane (optional). 12. Eye product (optional). 13. Moisturizer. 14. Optional sealing layer if dry/AC. 15. Sunscreen SPF50+ PA++++ (non-negotiable). 16. Lip SPF (optional).

PM Maximum Stack: 1. Micellar pre-cleanse (optional). 2. Oil cleanser if wearing SPF/makeup. 3. Water cleanser. 4. pH-prep toner (optional). 5. Hydrating toner layers (optional). 6. Essence (optional). 7. Soothing serum (optional). 8. Anchor active of the night, if any (retinol/acid — different lane). 9. This pigment-support serum, 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: Retinoid OR Exfoliation OR Strong Vitamin C (LAA) OR Acne-control active per routine; barrier/hydration/pigment-support can always accompany.

Tier: light fluid serum. Layering rule: apply after watery toners, before moisturizer. Phase: water-phase, no known pilling triggers among the confirmed ingredients.

PIH vs. PIE: brown or tan marks (PIH) are excess melanin and respond to niacinamide/arbutin — this is what this serum targets. Red or pink marks (PIE) are damaged capillaries and respond better to centella/azelaic acid and time; this serum will not fade PIE.

Hyperpigmentation (PIH): arbutin inhibits tyrosinase; niacinamide blocks melanosome transfer from melanocytes to keratinocytes — two mechanisms on the same pathway. Dullness: supported by the same mechanisms plus general hydration. Secondary benefit: niacinamide's barrier and oil-regulation support. What it cannot do: it cannot lighten your natural skin tone — brightening means fading excess pigment, not changing your baseline complexion — and it cannot fade red/pink PIE marks.

Sunscreen (mandatory, this serum does not work without it): primary — Beauty of Joseon Relief Sun: Rice + Probiotics SPF50+; alternatives — SKIN1004 Centella Hyalu-Cica Water-Fit Sun Serum, Anua Heartleaf Silky Moisture SunCream, ROUND LAB Birch Juice Tone-Up Sunscreen.

Moisturizer to seal: primary — Beauty of Joseon Dynasty Cream; alternatives — Dr.Althea 147 Barrier Cream, SKIN1004 Centella Probio-Cica Enrich Cream, Anua Birch Moisture Boosting Cream.

Complementary pigment lane: if you also have active acne alongside PIH, COS DE BAHA Azelaic Acid Serum addresses both acne and redness through a different pathway and can be alternated on separate nights.

Water-Permeable (wudu-compatible). This is a light, non-occlusive, non-film-forming serum. 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: "Brightening serums lighten your overall skin tone." REALITY: arbutin and niacinamide fade excess pigment in specific dark spots; they do not and cannot change your natural baseline complexion.

MYTH: "Any dark mark will respond to this serum." REALITY: only brown/tan marks (PIH, from melanin) respond — red/pink marks (PIE, from damaged capillaries) need a different approach like centella or time.

Mauritius tap water hardness varies by region; a hard-water film after cleansing can make this serum feel like it's "sitting on top" rather than absorbing — a pH-balancing toner beforehand usually resolves that.

Full INCI list: Aloe Barbadensis Leaf Extract, Propanediol, Arbutin, Niacinamide, Glycerin, 1,2-Hexanediol, Sodium Hyaluronate, Dipotassium Glycyrrhizate, Allantoin, Hamamelis Virginiana (Witch Hazel) Leaf Extract, Rosmarinus Officinalis (Rosemary) Extract, Eucalyptus Globulus Leaf Extract, Thymus Vulgaris (Thyme) Extract, Aspalathus Linearis Extract. [--- Estimated 1% Line ---] Estimated after Sodium Hyaluronate — ingredients from Dipotassium Glycyrrhizate onward are estimated (not brand-confirmed) to sit below 1%.

Preservative system: 1,2-Hexanediol (multifunctional preservative-booster/solvent).

Fragrance status: Fragrance-Free (no Parfum/Fragrance listed). Scent: likely a faint herbal note from the witch hazel/rosemary/eucalyptus/thyme extracts. Intensity: estimated 1 out of 5. EU 26 allergen screen: none of the 26 named allergen molecules detected as standalone listings; the aromatic plant extracts present (especially eucalyptus and rosemary) can carry trace natural allergens even without a declared fragrance — patch test if you're extract-sensitive. Alcohol disclosure: Alcohol-Free.

Halal: *Self-assessed by Adilsons based on available INCI data. No ethanol, no porcine-derived ingredients, and no haram animal-derived ingredients detected in the declared list. This is NOT a formal Halal certification.

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

Cruelty-Free: *Brand-stated policy, not independently certified by Leaping Bunny, PETA, or equivalent audit.

Microplastic-Free: Yes.

MFDS Classification: not publicly confirmed as Functional Cosmetic in this research; if the 5%/5% claims hold, this would plausibly qualify under Korea's whitening-functional category, though this was not independently verified. Whitening translation: the Korean "미백" (mibaek) classification means regulation of melanin production — fading dark spots to reveal your natural tone, not bleaching or changing your natural complexion. Clinical evidence: both arbutin's tyrosinase-inhibition and niacinamide's melanosome-transfer-blocking mechanisms are well-established ingredient-class science; no brand-run trial for this exact SKU was found. Evidence confidence: Medium-High for the ingredient mechanisms, Medium for this specific product's real-world results.

Fungal Acne Safety: FA-Safe. No documented Malassezia-feeding esters among the confirmed ingredients.

Assessment: Low. No known pilling triggers among the confirmed ingredients.

Fresh appearance: clear to pale. Storage: keep out of direct sun and away from prolonged heat above roughly 30°C. Spoilage signs: off smell, cloudiness, separation, or unexpected darkening. When in doubt, discard.

Patch test: inner forearm for 24 hours, then behind the ear for 24 hours, then begin facial use. If adverse reaction: STOP ALL ACTIVES. For 72 hours, use ONLY gentle cleanser plus plain moisturizer plus mineral SPF. After 72 hours, reintroduce ONE product per 14 days. Emergency stop signals: hives, swelling, blistering, persistent burning, or breathing difficulty — seek emergency care.

1. Skipping sunscreen and expecting fading anyway. 2. Judging results before 8-12 weeks. 3. Using it on red/pink PIE marks expecting fading (wrong mechanism). 4. Expecting overall skin lightening rather than spot-fading. 5. Storing the bottle somewhere hot.

Volume: 30ml. Amount per use: 2-3 drops (~0.4-0.6ml). Approximate uses per container: roughly 50-70 applications. Lifespan: at twice-daily use, approximately 4-5 weeks. Reorder roughly 2 weeks before you expect to run out, since consistency is what drives results for this active.

This serum's job is pigment-pathway support — it sits in the pigment support lane, and it needs daily SPF to actually work. AM: cleanse → toner (optional) → Arbutin+Niacinamide Serum → moisturizer → sunscreen (mandatory). PM: cleanse → toner (optional) → Arbutin+Niacinamide Serum → any other active → moisturizer.

If you also have active breakouts alongside dark spots: add COS DE BAHA Azelaic Acid Serum on alternate nights for the acne/redness angle this serum doesn't cover. If your SPF habit isn't consistent yet: fix that before expecting results from this product — it is the single biggest lever for whether this works.

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 Arbutin+Niacinamide 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 pure niacinamide at a higher concentration without the arbutin/pigment-targeting component, COS DE BAHA Niacinamide 10 Serum (1.5ml trial size) is a real, in-stock alternative from the same brand at double the niacinamide %, with Zinc PCA instead of arbutin.

Choose this Arbutin+Niacinamide Serum over the plain Niacinamide 10 Serum if your primary goal is fading existing brown/tan dark spots, not general oil control.

Upgrade triggers: you have visible brown/tan PIH marks; your main goal is spot-fading rather than oiliness control; you have consistent daily SPF. Do not upgrade yet if: your marks are red/pink (PIE, different mechanism needed); you have no SPF habit yet, in which case this product's core mechanism won't show results regardless of which one you pick.

If you match 2 or more upgrade triggers above, this product is worth choosing. If not, the plain niacinamide alternative is sufficient and simpler. Consistency beats complexity.

This product's PRIMARY function is: pigment-pathway brightening via arbutin + niacinamide. You do NOT need this if you already own another arbutin or high-% niacinamide product targeting the same PIH concern — finish that one first. Stacking assessment: Marginal Benefit if run alongside a separate niacinamide-only serum (overlapping mechanism); Significant Benefit if your current routine has no dedicated pigment-support step.

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.

Parent Company: JAINA Co., Ltd (CEO Junwon Lee). Founded: 2019. Headquarters: Suwon, South Korea. Manufacturing: contract manufacturing in South Korean laboratories the brand states are MFDS-certified.

COS DE BAHA positions itself as a value/high-potency actives brand, selling clearly-labeled single- and combo-active serums at accessible prices relative to prestige K-beauty actives brands. This brightening serum sits alongside the brand's Tranexamic Serum and Niacinamide 10 Serum as its main pigmentation-focused options.

An independent review-aggregator source described this product as "seriously underrated," specifically reporting no purging and no irritation for that user, with the product appearing in roughly 54 community-built routines on that platform. This is a single anecdotal account rather than a verified Reddit/Amazon thread, and we did not find broader praise/complaint themes for this exact SKU beyond it.

How long until I see fading? Realistically 8-12+ weeks of consistent use with daily SPF — pigment correction is slow by nature.

Will this lighten my overall skin tone? No — it fades excess pigment in dark spots, it does not change your natural baseline complexion.

Does this work on red acne marks? No — those are PIE (capillary damage), not PIH (melanin); this serum targets brown/tan marks specifically.

Can I use this with retinol or an acid? Yes, no active-lane conflict.

Is it safe for sensitive skin? Generally yes per available feedback, though it contains several aromatic plant extracts worth patch-testing if you're extract-reactive.

Arbutin

A tyrosinase-inhibiting brightening ingredient derived from bearberry-type plants.

Tyrosinase

The enzyme that produces melanin (pigment) in skin.

PIH

Post-inflammatory hyperpigmentation — brown/tan marks from excess melanin.

PIE

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

Melanosome transfer

The process by which pigment-containing structures move from melanocytes into surface skin cells.

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 with genuine brown/tan hyperpigmentation who already has (or is ready to build) a consistent daily SPF habit. Key benefits: real 5%/5% brand-stated actives on two complementary pigment-pathway mechanisms, gentle enough for sensitive skin per available feedback. Keep in mind: results take 8-12+ weeks and depend entirely on SPF consistency; it will not help red/pink PIE marks or change your natural skin tone.

Assessment: Suitable for most treatment-sensitized skin, based on the confirmed formula being fragrance-free, retinoid-free, and minimal-preservative (1,2-Hexanediol only). The aromatic plant extracts present are mild but worth flagging to your care team given generally heightened sensitivity during treatment. Consult your oncology care team before introducing any new skincare products during treatment.

Quick scanner: Week 1-2 introduce alone once daily, monitor for any sensitivity to the botanical extracts. Week 3-4 move to twice daily (AM+PM) if stable, with SPF locked in for the AM use. Week 5+ this can safely run indefinitely at twice-daily use — pigment fading benefits from consistency more than from increasing dosage.