COS DE BAHA Hyaluronic Serum 30ml

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

Pros: extremely simple formula, layers under anything, fragrance-free, budget-friendly hydration step. Caveats: COS DE BAHA sells several similarly-named hyaluronic serums (plain, B5-added, Centella-added, snail-added); this description is built on the closest-matching simple formula and flagged as medium-low confidence on the exact SKU-to-INCI match; if used alone in AC without a sealing moisturizer, it can backfire.

Bedside-compatible: yes. Requires rinsing: no. Requires precise dosage: no. Wait time: minimal. This is one of the simplest, most forgiving products to keep in a bare-bones 2-product routine (this serum + moisturizer) on low-energy days.

Step 1 (When): AM and PM, on slightly damp skin. Step 2 (How much): 2-3 drops. Step 3 (How): pat in, then seal with moisturizer within about a minute.

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 or splash (optional). 2. Toner (optional). 3. COS DE BAHA Hyaluronic Serum on damp skin. 4. Moisturizer — do not skip, HA needs sealing. 5. Sunscreen SPF50+ PA++++. Humid Mauritius mornings favor this kind of humectant, since it can draw ambient moisture rather than relying only on your skin's own water.

1. Double cleanse if wearing SPF/makeup. 2. Toner (optional). 3. COS DE BAHA Hyaluronic Serum on damp skin. 4. Any active you're running that night (no conflict with this product). 5. Moisturizer to seal. This is a Recovery-night-compatible product in a 4-night skin-cycling protocol.

Technique: pat/press, do not rub. Skin state: damp skin is essential — hyaluronic acid needs water present to bind, applying it to bone-dry skin in a dry room can pull moisture the wrong way. Wait time: seal with moisturizer within about 60 seconds. Hands deliver 100% of product versus roughly 30-40% absorbed by a cotton pad — 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. Amount defaults: toner/essence 5-8 drops, serum 2-3 drops or 1 pump, eye product half a rice grain, gel moisturizer 1-1.5 peas, cream 1-2 peas, occlusive rice-grain to pea, sunscreen 2-finger rule for face. Hydrators sit best on slightly damp skin; retinoids on fully dry skin; exfoliating acids on dry or lightly damp, one lane only. 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 (choose one). 9. Hydration serum lane — this product's role. 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). In AM, prioritize comfort and SPF adherence over stacking.

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 (optional; this product has no lane conflict and can sit before or after it). 9. Targeted serum (optional). 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 can always accompany. If unsure, default to the safest lane — barrier/hydration.

Tier: water-thin. Apply right after cleansing/toning, before any thicker serum or cream. Phase: pure water-phase, layers under everything with no pilling risk from the ingredients confirmed. Molecular-weight note: commercial hyaluronic acid serums typically blend multiple molecular weights; the exact weight distribution in this SKU is not publicly disclosed, so it is treated here as a surface-hydrating humectant rather than claiming deep penetration.

If your oily skin looks shiny but feels tight underneath, that is dehydrated-oily skin, not truly oily skin — the oiliness is often a compensatory response to lost surface water, and this kind of humectant step (sealed with a lightweight moisturizer) can reduce that compensatory oil production over time.

Dehydration: sodium hyaluronate binds water molecules in the upper skin layers. Fine dehydration lines: plumping from bound water can temporarily soften the look of lines caused by dryness (not the deeper, structural wrinkles caused by collagen loss). What it cannot do: it cannot fix hyperpigmentation, acne, texture, or true (collagen-loss) wrinkles — it is a hydration tool, not a treatment for those concerns.

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

Sunscreen (mandatory AM): 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.

Active pairing: this serum has no lane conflict and can be layered before or after your COS DE BAHA Retinol Serum, Azelaic Acid Serum, or Vitamin C Serum to buffer dryness from those actives.

Water-Permeable (wudu-compatible). This is a watery, 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: "More hyaluronic acid layers always means more hydration." REALITY: without a moisturizer to seal it, especially in an air-conditioned room, hyaluronic acid can pull water from your own deeper skin layers instead of the air, leaving you drier than before.

MYTH: "Hyaluronic acid penetrates deep to plump wrinkles from within." REALITY: topical hyaluronic acid mostly binds water at and near the surface; it softens the look of dehydration lines, it does not replace lost collagen.

In air-conditioned environments, hyaluronic acid draws moisture FROM your deeper skin layers instead of from the air. ALWAYS seal this product with an occlusive or moisturizer when in AC for extended periods. Mauritius tap water hardness varies by region; if skin feels tight right after cleansing, a hard-water residue is often the real cause and this serum will feel more effective once that's addressed with a gentle toner.

Full INCI list: Purified Water, Sodium Hyaluronate, 1,2-Hexanediol. [--- Estimated 1% Line ---] Not applicable — this is a 3-ingredient formula and Sodium Hyaluronate is the second-listed ingredient by weight. Note: COS DE BAHA sells at least three other hyaluronic-acid serum variants (with added Panthenol, Centella, or Snail Mucin) under closely related names; this simple 3-ingredient list is our best-supported match for the plain "Hyaluronic Serum" title on this exact SKU, medium-low confidence, and should be re-verified if the brand updates its own product pages.

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

Fragrance status: Fragrance-Free. Scent: effectively none based on the confirmed ingredients. Intensity: 0 out of 5. EU 26 allergen screen: none detected. 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 ingredient list (note: some hyaluronic acid on the market is derived from bio-fermentation rather than animal sources, which this brand's ingredient list is consistent with, though the exact production method was not independently confirmed). 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. Clinical evidence: the water-binding mechanism of hyaluronic acid/sodium hyaluronate is Strong, well-established ingredient-class evidence; no brand-run clinical trial for this exact SKU was found. Evidence confidence: Medium-High for the ingredient, Low for brand-specific claims beyond the ingredient itself.

Fungal Acne Safety: FA-Safe. No known Malassezia-feeding esters in the confirmed 3-ingredient formula.

Assessment: Low. This product's own ingredients present no pilling risk; pilling is more likely if it is not fully absorbed before a heavy cream or SPF is applied on top — wait roughly 60 seconds.

Fresh appearance: clear, colorless to very slightly cloudy gel-serum. Storage: keep away from direct sun and prolonged heat above roughly 30°C. Spoilage signs: unexpected discoloration, an off smell, or visible separation. 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. Applying to completely dry skin in a dry room and expecting plumping. 2. Skipping the moisturizer afterward. 3. Using it as your only hydration step in heavy AC without an occlusive. 4. Expecting it to treat pigmentation or acne. 5. Storing the bottle somewhere hot. There is no established overuse ceiling for this ingredient at normal use frequency.

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; overdosing wastes product without extra benefit since excess HA on the surface without a sealant simply evaporates. Reorder roughly 2 weeks before you expect to run out.

This serum's single job is hydration — it sits in the hydration serum lane, always followed by a moisturizer. AM: cleanse (optional) → toner (optional) → Hyaluronic Serum on damp skin → moisturizer → sunscreen. PM: cleanse → toner (optional) → Hyaluronic Serum → any active → moisturizer.

If you are in AC all day: never skip the sealing moisturizer step. If your skin is barrier-compromised right now: this is one of the safest products to keep using while other actives are paused. If you use a retinol or acid at night: apply this serum first on damp skin to buffer some of the dryness those actives cause.

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 Hyaluronic 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.

We do not currently carry a directly comparable single-ingredient hyaluronic acid serum from another brand to weigh this against — this exact niche is under sourcing review beyond COS DE BAHA's own line. If you want hydration plus additional soothing or repair actives in one step, see COS DE BAHA Snail Serum, which layers hyaluronic acid with snail secretion filtrate and niacinamide instead of standing alone.

This product's PRIMARY function is: surface hydration via water-binding. You do NOT need this if you already own any other hyaluronic acid serum, toner, or essence with a similar humectant profile — finish that one first. Stacking assessment: No Benefit if layered with another plain HA product (same mechanism, wasted product); Significant Benefit if your current routine has no dedicated hydration step at all.

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.

Because COS DE BAHA sells several visually similar hyaluronic serum bottles, check that the printed ingredient list on your unit matches what is on the label before assuming which variant you have.

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 single-active and combo-active serums at clearly labeled concentrations for less than many prestige K-beauty actives brands. This hyaluronic serum represents the simplest end of that catalog — a bare-bones, single-mechanism hydrator alongside the brand's more complex active lines.

Community reviews for this specific 30ml SKU were not yet available in our research at the time of writing — WebSearch surfaced other COS DE BAHA hyaluronic variants and general ingredient pages but no verifiable Reddit, Amazon, or YesStyle review text matched to this exact product. We will not invent quotes to fill this section.

Can I use this every day? Yes, twice daily is standard for a plain hydrating serum.

Do I need to seal it with moisturizer? Yes — this is not optional, especially in air-conditioning, or the product can pull water from your own skin instead of adding it.

Which COS DE BAHA hyaluronic serum is this? Based on the plain "Hyaluronic Serum" title with no added Panthenol/Centella/Snail qualifier, this is treated as the brand's simplest formula; check your own bottle's printed INCI to confirm.

Can I use this with retinol or Vitamin C? Yes, it has no active-lane conflict and can help buffer dryness from either.

Will this reduce deep wrinkles? No — it softens the look of dehydration lines, it does not rebuild lost collagen.

Sodium Hyaluronate

The salt form of hyaluronic acid, used in skincare for its water-binding ability.

Humectant

An ingredient that attracts and holds water in the skin.

Dehydrated-oily skin

Skin that looks shiny from compensatory oil but feels tight from lack of water.

1,2-Hexanediol

A multifunctional ingredient used as a mild preservative-booster and solvent.

Occlusive

An ingredient that forms a film to slow water loss from the skin.

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 needing a simple, fragrance-free hydration boost regardless of skin type, especially as a buffer alongside stronger actives. Key benefits: minimal ingredient list, fast absorption, layers under any moisturizer or active, budget-accessible. Keep in mind: must be sealed with a moisturizer to work properly, especially in AC; the exact SKU-to-INCI match among the brand's several HA serum variants is medium-low confidence; no independent reviews for this exact SKU were found.

Assessment: Suitable for most treatment-sensitized skin — the confirmed formula is fragrance-free, retinoid-free, and minimal-preservative (1,2-Hexanediol only). Consult your oncology care team before introducing any new skincare products during treatment.

AC/humidity swing interaction: because this product's entire function depends on ambient water availability, extended air-conditioning exposure is its single biggest real-world risk factor — without a sealing moisturizer, the humectant effect can reverse and pull water from your own deeper skin layers. In outdoor Mauritius humidity, the same mechanism works in your favor, drawing from the air instead.