NINE LESS Molecule-Clear 5% Glycolic Acid Serum 30ml

100% Genuine · FA-Safe · Fragrance-Free · Halal-Friendly* · Vegan-Friendly* · Wudu-Compatible · Pregnancy-Screened*

If you've been double-cleansing and moisturizing diligently but your skin still looks flat under makeup or catches light unevenly across your cheeks, that's not a routine failure — it's a build-up of dead corneocytes that ordinary cleansing physically cannot remove. This serum's job is narrow and specific: dissolve the "glue" between those cells so fresh skin underneath can surface faster.

Pros: smallest AHA molecule for fast, even surface renewal; genuinely fragrance-free and FA-safe formula; hydrating support ingredients built in rather than a bare acid-and-water solution; usable across most non-reactive skin types with correct pacing.

Caveats: not suitable for a currently compromised barrier; requires consistent daily SPF once introduced; exact pH and free-acid percentage are not disclosed, so tolerance can't be predicted from the label alone; small 30ml volume for a daily-adjacent active.

Classification: RED. A 5% Glycolic Acid leave-on serum is a clinical-strength exfoliant, and skin under 16 has not yet completed the epidermal maturation that makes controlled chemical exfoliation predictable — thinner, more reactive stratum corneum in younger skin means a higher risk of irritation, barrier stripping, and photosensitivity at the same concentration an adult would tolerate.

The packaging itself is not youth-targeted (no cartoon branding, pastel colors, or "fun" flavoring) — this is a lab-styled clinical serum, not a product marketed at teens. That does not change the RED classification; it just means the risk here is a parent buying it for a teen's "glow" without realizing the active strength, not the brand courting that purchase.

For teenage skin dealing with texture or dullness, a gentler entry point in this same catalog is the NINE LESS Molecule-Clear Lactic Acid Serum — lactic acid's larger molecule penetrates more slowly and is the standard "first AHA" recommendation, still best reserved for 16+ with a parent's guidance and a patch test first.

Step 1 — When: PM only for your first 4 weeks; AM use only later, and only with strict SPF.

Step 2 — How much: 2-3 drops (roughly a coin-size pool in your palm), applied to a fully cleansed, dry face.

Step 3 — How: Press into skin with clean fingertips, avoiding the eye area and any broken skin; do not layer with any other acid, retinoid, or Vitamin C product the same night.

The one rule: 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. Rinse or gentle cleanse. 2. Hydrating toner (optional). 3. Antioxidant serum (Vitamin C, if that's your AM lane — not this product). 4. Moisturizer. 5. Sunscreen SPF50+ PA++++ (non-negotiable). In Mauritius' humid mornings, humectants like the Sodium Hyaluronate in this serum pull water from the surrounding air rather than from your own deeper skin layers, so a light AM layer tends to feel comfortable even before your moisturizer goes on.

AM restriction: Reserve this specific serum for PM only during your first month. Glycolic acid measurably increases UV sensitivity by removing the protective dead-cell layer, and an AM introduction without a proven SPF habit meaningfully raises sunburn and rebound-pigmentation risk.

SPF mandate: Once you do move this to AM (only after your barrier has proven tolerant for 3-4 weeks), SPF50+ PA++++ is mandatory every single day you use it, rain or shine, indoors-all-day or not.

1. Double cleanse if wearing sunscreen/makeup. 2. Toner (optional, pH-prep). 3. This serum — 2-3 drops on fully dry skin, wait 1-3 minutes before the next step. 4. Moisturizer. 5. Occlusive seal only if your skin runs dry or you sleep under air-conditioning.

Skin cycling integration: This serum occupies the Exfoliation lane of a 4-night cycle — Night 1 this serum, Night 2 a retinoid (if you use one), Nights 3-4 recovery with barrier-only products. Do not run it on a retinoid night.

Technique: Pat/press into skin — do not rub. Friction on an already-loosened surface layer increases micro-irritation and doesn't speed absorption.

Required skin state: Fully dry. Applying acids to damp skin increases penetration speed and, with it, sting and irritation risk — this is one active where "damp skin absorbs better" is the wrong instinct.

Wait time: 1-3 minutes before moisturizer, so the pH-dependent acid has time to act at its intended activity window before being buffered by the next layer.

Hands deliver 100% of product. Cotton pads absorb approximately 30-40%. Use hands for this serum rather than a cotton pad swipe.

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 times — watery layers 10-20s, serum layers 30-60s, 10-15 min before sunscreen if going outdoors. Defaults — toner/essence 5-8 drops per layer, serum 2-3 drops or 1 pump, eye product ½ rice-grain per eye, gel moisturizer 1-1.5 peas, cream 1-2 peas, occlusive rice-grain to pea-size, sunscreen 2-finger rule for face plus 1 finger for neck. Hydrators go on slightly damp skin; exfoliating acids (like this one) go on dry skin. If the routine pills, stings, or feels heavy, reduce layers — never increase them.

AM Maximum Stack: 1. Rinse/Gentle Cleanse (optional). 2. pH-Prep Toner (optional). 3. Hydrating Toner Layers (1-3, optional). 4. Essence (optional — choose toner-layering or essence, not both if you pill easily). 5. Mist (optional). 6. Booster/Soothing Serum (optional). 7. Antioxidant Lane — choose ONE (L-Ascorbic Acid Vitamin C or a gentler antioxidant). 8. Pigment Support Lane — choose ONE (TXA/arbutin/azelaic if AM-tolerated). 9. Hydration Serum Lane (HA/polyglutamic acid). 10. Oil-Control Lane (niacinamide/zinc). 11. Peptides/Growth-Factor Lane (optional). 12. Eye Serum/Cream. 13. Moisturizer. 14. Optional Sealing Layer (dry/AC days only). 15. Sunscreen SPF50+ PA++++ (non-negotiable). 16. Lip SPF (optional). In AM, prioritize comfort + 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 worn). 3. Water Cleanser. 4. pH-Prep Toner (optional). 5. Hydrating Toner Layers (optional). 6. Essence (optional). 7. Soothing/Barrier Serum (optional). 8. [Anchor — this serum], on fully dry skin, wait 1-3 minutes. 9. Targeted Serum (optional, only if non-conflicting). 10. Moisturizer. 11. Sleeping Mask (optional). 12. Occlusive Seal (optional). 13. Spot Treatment/Patch (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.

Tier: Light fluid — thin, watery, with a slight body from Hydroxyethylcellulose (a mild thickener), not a true water-thin essence and not a gel. Apply after any thinner toner/essence layers, before your moisturizer.

Layering rule: Thinnest to thickest, water-phase before oil-phase. This serum is fully water-phase — it has no oils to disrupt, but everything applied after it (moisturizer, sunscreen) should still come later in the stack, not before.

Phase compatibility: Water-phase, no silicone or oil content detected in the declared INCI — it will not create a barrier that blocks a moisturizer's absorption.

Rest days: At least 3-4 recovery nights per week for new users, dropping toward alternate-night use (3-4x/week) once tolerance is established over 6-8 weeks.

Overuse warning: Do not exceed nightly use even once tolerant. Exceeding a 3-4x/week cadence does NOT produce faster results — it produces barrier damage, visible redness, and increased sun sensitivity.

Purging vs. reaction: PURGING (rare with an AHA, more common with retinoids) occurs in your usual breakout zones, stays surface-level, and resolves in 4-6 weeks. A REACTION — burning, swelling, hives, or spreading to new areas — means stop immediately; this is not something to "push through."

Prerequisites: Before starting this product, your routine MUST already include a gentle cleanser, a basic moisturizer, and a daily SPF habit you actually keep. Without these foundations, this product causes more harm than benefit.

Barrier index gate: If your skin stings on moisturizer, feels tight within 30 minutes of cleansing, or shows visible flaking, your barrier is below threshold. Start with the Dr.Althea 147 Barrier Cream alone for 1-2 weeks before introducing this serum.

Rough, uneven texture: Glycolic acid dissolves the desmosome bonds holding dead corneocytes together, accelerating their shedding so smoother skin surfaces faster than passive turnover alone.

Dullness: A build-up of dead cells scatters light unevenly; removing that layer lets skin reflect light more evenly, which reads as "glow" without any brightening agent involved.

Enlarged pores (appearance): Clearing dead-cell and debris build-up at the pore opening makes pores look smaller — this does not physically shrink the pore structure itself.

PIH vs. PIE: This serum helps fade PIH (brown/dark flat marks from excess melanin) by accelerating the shedding of pigmented surface cells. It does not address PIE (pink/red marks from damaged capillaries) — that needs time, sun protection, and vascular-focused ingredients like centella, not exfoliation.

What this product cannot do: It cannot physically shrink pore structure, cannot lighten your natural skin tone, cannot treat active inflammatory acne on its own, and cannot substitute for sunscreen — it increases the need for one.

1. Anua PDRN Hyaluronic Acid Capsule 100 Serum — multi-weight hyaluronic acid replenishes surface moisture immediately after exfoliation reduces the skin's own water-holding layer. Use PM, straight after this serum.

2. TIA'M Vita B3 Source — a niacinamide/arbutin serum working a different pathway (sebum regulation, melanosome-transfer inhibition) rather than exfoliation, so it doesn't compete for the same "active lane." Best used AM, opposite this serum's PM slot.

3. Dr.Althea 147 Barrier Cream — a five-type ceramide cream that seals the lipid barrier this serum's acid has just made more permeable. Use every PM this serum is applied.

4. SKIN1004 Madagascar Centella Hyalu-Cica Water-Fit Sun Serum — a mandatory AM partner, not optional: glycolic acid measurably raises UV sensitivity, and Centella adds a calming layer for any residual reactivity from the previous night's acid.

Pilling pairs: Layering a second film-forming or silicone-heavy product directly on top of this serum before it fully absorbs can pill. Wait the full 1-3 minutes and pat (don't rub) the next layer on to avoid it.

This is a conflict-solver for ACTIVE ingredients. If you run multiple actives, use these rules to avoid irritation, deactivation, and barrier damage.

Universal rules: Run only one primary active lane (Retinoid OR Acid Exfoliation OR L-Ascorbic Acid Vitamin C OR Benzoyl Peroxide OR strong acne lane) per routine. If you break a rule, don't push through — reduce frequency, split AM/PM, or alternate nights. If moisturizer stings or skin feels tight within 30 minutes of cleansing, pause all actives and run barrier-only for 3-7 days. Wait-time defaults: watery layers 10-20s, serums 30-60s, this acid needs 1-3 minutes minimum if you insist on layering (splitting across AM/PM is safer), sunscreen 10-15 min before sun.

× Retinoids (Retinol/Retinal/Tretinoin/Adapalene): Never same night. Instead, skin cycle (Night 1 this serum → Night 2 retinoid → Nights 3-4 recovery), or alternate nights entirely, keeping the two on separate calendar days.

× BHA (Salicylic Acid): Avoid same night for most people — stacking two exfoliation mechanisms compounds barrier stress. Instead, run this serum and a BHA on separate nights (e.g. this serum Mon/Fri, a BHA product Wed) only if you're already advanced with actives; the brand's own sibling Molecule-Clear Salicylic Acid Serum is currently out of stock in this catalog, so pair with whatever BHA you already own rather than waiting on a restock.

× L-Ascorbic Acid (pure Vitamin C): Don't layer in the same routine — the low pH environments both need can conflict, and stacking acidity increases sting risk. Instead, run Vitamin C AM (like the The Ordinary Vitamin C Suspension) and this serum PM — the classic split.

× Other AHAs (same lane, e.g. the Mandelic or Lactic siblings): Don't stack two strong acids the same night — pick one primary AHA and use any other only as an occasional swap, never combined.

× Direct acids × Peptides/Copper Peptides: Avoid immediate layering — low pH can destabilize peptide bonds. Instead, use peptide products AM and this serum PM, or wait a full 20 minutes if you insist on the same routine.

Section 15C — Scheduling Templates:

Template A (AM/PM Split): AM — Antioxidant (Vitamin C) → Moisturizer → SPF. PM — This serum (Exfoliation lane) → Moisturizer.

Template B (4-Night Skin Cycling): Night 1 — this serum (Exfoliation). Night 2 — Retinoid, if used. Nights 3-4 — Recovery, no actives.

Template C (Alternate-Night, simpler): Mon/Wed/Fri — this serum. Tue/Sat — a different active only if advanced. Thu/Sun — Recovery.

Do not layer retinoids with AHA/BHA in the same night; keep "one lane" per night. 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.

Pre-period breakouts happen because progesterone causes the pore lining to physically swell, narrowing the opening and trapping sebum beneath. Continued exfoliation through the luteal phase can help keep that opening clearer, but if your skin is also more reactive during this window, back off frequency rather than pushing through irritation.

Water-Permeable (wudu-compatible). This is a fully water-phase, alcohol-thin serum with no waxes, silicones, or film-forming polymers in significant concentration in the declared INCI — it absorbs into skin rather than sitting on top as a barrier.

Once absorbed (1-3 minutes after application), water used for wudu should reach the skin normally, the same as with any other water-based leave-on 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: "Higher percentage always exfoliates better." REALITY: pH and free-acid percentage matter more than the label number — an unbuffered 5% at low pH can be harsher than a well-buffered 10%. This brand does not disclose pH, so treat the 5% figure as a starting reference, not a guarantee of gentleness.

MYTH: "You should feel a strong tingle for it to be working." REALITY: Mild warmth is normal; a strong, escalating burn is a sign to stop, not a sign of efficacy.

MYTH: "Exfoliating acids shrink your pores permanently." REALITY: They clear the debris that makes pores look larger; the pore's actual structural size is set by genetics and does not change.

July-November: PM2.5 increases during sugar cane harvest burns. Since this serum increases skin sensitivity and turnover, freshly exfoliated skin is marginally more reactive to airborne particulate during this window — a non-tacky sunscreen and a clean pillowcase help more than any product change.

Hard water note: Mauritius tap water hardness varies by region; hard water can leave a mild calcium-stearate film after rinsing. Since this is a leave-on product, that residue mainly matters at the cleansing step before it — a pH-adjusting toner beforehand helps this serum perform as intended on a truly clean, balanced surface.

*Concentration for Glycolic Acid is the brand's own stated percentage; the exact figure has not been independently lab-verified by Adilsons. All other listed actives have no brand-disclosed percentage — "not disclosed" is stated rather than estimated.

Free Acid Value: pH not publicly disclosed. Sodium Hydroxide appears mid-formula, indicating the acid is at least partially neutralized (buffered) rather than left fully unbuffered — but without a disclosed pH or pKa, we cannot state a precise free-acid percentage or a "gentle/moderate/strong" rating with confidence. Treat this as a genuine clinical-strength AHA and patch test accordingly.

Full INCI: Water, Glycolic Acid, Butylene Glycol, Dipropylene Glycol, Propanediol, Sodium Hydroxide, 1,2-Hexanediol, [--- Estimated 1% Line ---] Panthenol, Hydroxyethylcellulose, Sodium Hyaluronate, Betaine, Allantoin, Ethylhexylglycerin, Disodium EDTA, Sodium Acetate, Isopropyl Alcohol, Cellulose, Citric Acid, Tocopherol.

*This INCI was cross-referenced from the product's Amazon.com listing and an independent ingredient database rather than read directly from brand packaging or the brand's own site (both were unreachable during this research pass) — treat it as medium, not maximum, confidence, and defer to your physical bottle's printed list if it differs.

Preservative system: 1,2-Hexanediol and Ethylhexylglycerin — a common modern, paraben-free preservative-booster pairing.

Fragrance status: Fragrance-Free. No Parfum/Fragrance, and no individually-listed essential oil or EU 26 allergen compound appears anywhere in the declared INCI.

Scent: No deliberate scent expected; a faint neutral/chemical note from the acid itself is normal and not a spoilage sign.

EU 26 allergen screen: None detected in the declared INCI.

Alcohol disclosure: Isopropyl Alcohol appears near the end of the ingredient list (position 16 of 19), which places it at an estimated low concentration — most plausibly acting as a co-solvent/stabilizer for the acid system rather than a bulk solvent. It is a drying-type alcohol, not a fatty (moisturizing) alcohol, so very reactive or alcohol-sensitive skin should still patch test.

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. Note this differs from NINE LESS's own A-Control line, which contains Snail Secretion Filtrate — this Molecule-Clear Glycolic serum's own INCI carries no such ingredient.

Cruelty-free: *Brand-stated policy. Not independently certified by Leaping Bunny, PETA, or equivalent third-party audit. No Leaping Bunny or PETA Beauty Without Bunnies listing was found for NINE LESS in research.

Microplastic-Free: Yes — no polymer microbeads or film-forming plastics detected in the declared INCI.

MFDS classification: General Cosmetic. No MFDS Functional Cosmetic registration (which requires additional government testing for efficacy claims like whitening or wrinkle improvement) was found for this specific product.

Clinical evidence: Glycolic acid's exfoliation mechanism is well-established in the broader dermatological literature, but no product-specific clinical trial for this exact NINE LESS formula was found. The brand's "refines texture, fine lines, and enlarged pores" claim is a marketing-stated position rather than a cited study result. *Evidence Confidence: Marketing-Only for the product-specific claim; the underlying glycolic-acid-exfoliation mechanism itself carries Strong general evidence.

Fungal Acne Safety: FA-Safe. The declared INCI contains no Malassezia-feeding esters, fatty acid extracts, or polysorbates in the ingredient list checked — no FA-conditional or FA-unsafe ingredients were identified.

Assessment: Low. As a fully water-phase serum with no heavy film-formers, this product itself rarely pills on its own.

Pilling risk rises if you layer it under a heavy silicone-based primer or a thick, unabsorbed moisturizer too quickly. Wait the full 1-3 minutes and pat the next layer on rather than rubbing it in to avoid this.

Color baseline: Expect a clear-to-very-pale watery liquid. A noticeable yellow or brown tint developing over time can indicate oxidation — discard if this happens, as oxidized formulas can generate free radicals rather than deliver the intended benefit.

Storage: Keep out of direct sun and away from bathroom heat/humidity spikes where possible — a bedroom drawer or shelf outlasts a steamy bathroom cabinet for shelf life on acid formulas.

Spoilage signs: Color change, an off/sour smell distinct from the normal neutral scent, or visible separation that doesn't remix with a gentle shake. When in doubt, discard.

Patch test: Apply a small amount to your inner forearm, wait 24 hours, then to a spot behind your ear, wait another 24 hours, before your first full facial application.

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

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

Pregnancy note: Glycolic acid at 5% is not on the ingredient list that triggers this skill's formal pregnancy-contraindication warning (retinoids, salicylic acid above 2%, hydroquinone, chemical UV filters). *That said, this is a general ingredient screen, not medical advice — pregnant or nursing readers should still confirm with their own doctor before adding any active exfoliant to a routine. If avoiding actives during pregnancy by preference, the barrier-support Dr.Althea 147 Barrier Cream is a verified in-catalog, acid-free alternative for texture comfort.

1. Starting at nightly use instead of 2-3x/week. 2. Skipping SPF the morning after use. 3. Layering with a retinoid or another strong acid the same night. 4. Applying to damp skin, which increases sting and irritation. 5. Judging results before the 4-6 week epidermal turnover mark.

Overuse threshold: Daily use beyond the tolerance-building phase risks chronic barrier compromise — persistent redness, stinging, and rebound oiliness are the direct consequence, not a sign to push harder.

Usage math: At 2-3 drops per use and a 30ml bottle, expect roughly 150-200 applications at correct dosage.

Lifespan: At a realistic 3-4x/week PM cadence, this bottle lasts approximately 3-4 months. Over-applying (daily, heavy-handed use) can cut that to under 6 weeks without improving results — correct dosage extends the product's life without sacrificing outcome.

Reorder timing: Consider reordering roughly 2 weeks before you expect to run out, to allow for Mauritius shipping and processing time rather than running out mid-routine.

Once your skin tolerates this serum consistently, it becomes the exfoliation anchor of a texture-and-tone-focused PM routine — thin, fast-absorbing, and positioned right after cleansing, before your barrier-repair layers.

AM: 1. Gentle cleanse. 2. TIA'M Vita B3 Source (niacinamide, 2-3 drops, wait 30-60s). 3. Moisturizer. 4. SKIN1004 Water-Fit Sun Serum (2-finger rule, wait 10-15 min before sun).

PM (active nights): 1. Anua Heartleaf Succinic Cleansing Foam. 2. This serum — 2-3 drops on dry skin, wait 1-3 min. 3. Anua PDRN HA Capsule Serum (hydration buffer). 4. Dr.Althea 147 Barrier Cream.

If your skin is barrier-compromised right now: skip this serum entirely and run barrier-only (cleanser + moisturizer + SPF) for 1-2 weeks first.

If you're in air-conditioning most of the day: seal the routine with an occlusive after the barrier cream — humectants alone can pull moisture from your own skin in a dry AC environment.

If you're in your luteal phase and feeling reactive: drop to 2x/week or pause this serum entirely that week rather than forcing the usual cadence.

Stock-true bundle — Barrier-Safe AHA Routine: Anua Heartleaf Succinic Cleansing Foam + this serum + Dr.Althea 147 Barrier Cream + SKIN1004 Water-Fit Sun Serum — cleanse gently, exfoliate PM, repair the barrier same night, protect every AM.

Stock-true bundle — Hydration-First Pairing: Anua PDRN HA Capsule Serum + this serum + Purito SEOUL Oat-in Calming Gel Cream + Beauty of Joseon Relief Sun — built for anyone whose skin runs dry-leaning and needs extra hydration support around the acid step.

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

The recommendations above are based on formulation synergy with NINE LESS Molecule-Clear 5% Glycolic Acid 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 the same "clear away dead skin, reveal smoother texture" benefit but with a gentler, more forgiving entry point, the NINE LESS Molecule-Clear Lactic Acid Serum (same brand, same 30ml format) uses a larger AHA molecule that penetrates more slowly — generally considered the standard "first AHA" for sensitive-leaning or first-time acid users.

Choose the Glycolic Acid Serum over the Lactic Acid Serum if you need faster, deeper surface renewal: glycolic acid's smaller molecule penetrates faster and more evenly than lactic acid, so texture and dullness improvements tend to show sooner in tolerant skin.

Upgrade triggers (IF/THEN): IF you've used the Lactic Acid Serum for 6+ weeks with zero irritation, THEN you're a reasonable candidate to try this Glycolic variant instead. IF your main complaint is specifically rough texture rather than dryness or sensitivity, THEN glycolic's faster action is the better match. IF you're currently barrier-compromised, THEN do not upgrade yet — repair barrier first regardless of which acid you eventually choose.

Timing and lane: Both variants occupy the same Exfoliation lane in the Conflict Solver above — never run both the same night, and never on a retinoid night.

Don't upgrade if: your barrier is currently below threshold; you can't commit to daily SPF; you're new to acids entirely (start with lactic); or you already run a same-mechanism exfoliant elsewhere in your routine.

If you match 2 or more upgrade triggers above, THIS is worth choosing. If not, the Lactic Acid alternative is sufficient and safer. Consistency beats complexity.

Gentler entry: NINE LESS Molecule-Clear Lactic Acid Serum — larger molecule, slower penetration, the standard first-AHA choice.

This product: 5% Glycolic Acid Serum — smallest AHA molecule, faster and deeper surface action, for tolerant skin ready to move beyond lactic acid.

Beyond retail glycolic: Higher-percentage or lower-pH glycolic formulas and in-clinic chemical peels are the next real step up — those require professional administration and are outside what any retail serum, including this one, should attempt to replicate through overuse.

This product's PRIMARY function is: chemical exfoliation via a small-molecule AHA. You do NOT need this if you already own an active glycolic, lactic, or mandelic acid leave-on product you're using consistently — finish your current bottle before purchasing a duplicate.

Check your shelf for any open AHA exfoliant with the same primary mechanism before buying — most acid serums carry a PAO (Period After Opening) of roughly 6-12 months once opened (check your specific bottle's printed symbol), so buying a second bottle while one sits half-used is genuine waste.

Stacking assessment: No Benefit if you already run a same-mechanism AHA exfoliant (pick one, not both). Significant Benefit if you currently only use a retinoid or a BHA — glycolic acid works a genuinely different pathway (desmosome dissolution vs. sebaceous/keratin plug clearing for BHA, or cell-cycle modulation for retinoids).

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 checks for this product: confirm the batch code printed on the box matches the one on the bottle itself, check that the pump/dropper seal was intact on first open, and confirm the label ingredient order matches Water then Glycolic Acid as the first two entries — any listing that opens with a different order is worth flagging to our team.

Brand: NINE LESS. Parent company: Not publicly disclosed. Headquarters: South Korea (exact city not publicly disclosed). Hero ingredient/product: Azelaic Acid 10% (A-Control line), alongside this Molecule-Clear single-acid serum line. Manufacturing: Not publicly disclosed — no confirmed contract manufacturer or in-house facility identified in research.

NINE LESS positions itself as a dermatologist-adjacent, single-active-per-product Korean skincare brand — each SKU built around one named acid or active rather than a multi-ingredient "kitchen sink" formula. The Molecule-Clear line applies that same single-active philosophy to AHA/BHA exfoliation, offering Glycolic, Lactic, Mandelic, and Salicylic variants as distinct products rather than one blended acid cocktail, letting a customer pick the exact molecule that matches their tolerance.

Our research did not turn up a Reddit or Amazon-review thread specifically discussing this exact SKU (the Glycolic Acid variant) at the time of writing — stated plainly rather than filled in with invented quotes.

We did find one independent, named review source: DermApproved, a skincare review site, assessed this specific serum and summarized it as delivering "the classic AHA payoff — brighter, smoother, more refined skin — in a deliberately minimal, well-buffered base," describing it as an effective, beginner-friendly option that "won't shred your barrier." The same review flagged two honest caveats: the small bottle size relative to its positioning, and that it is not recommended for very sensitive skin.

Common praise theme (from DermApproved and general retailer listing language): the supporting cast of Panthenol, Betaine, and Allantoin genuinely offsets the acid's sting rather than being decorative. Common caveat theme: the 30ml size is small for a product meant to be used multiple times a week.

Sustainability: No brand-disclosed refill program or specific recyclability certification was found in research; check local Mauritius recycling guidance for the bottle material once empty.

Can I use this every day? No — start at 2-3x/week and build tolerance over 6-8 weeks; daily use from day one is the single most common cause of irritation with this category of product.

Will this help my acne scars? It can fade PIH (flat brown marks) over weeks of consistent use by accelerating pigmented-cell shedding, but it does not treat PIE (red/pink marks) or textured, indented scarring — those need different approaches.

Can I use this with my Vitamin C serum? Not in the same routine session — run Vitamin C AM and this serum PM to avoid stacking acidic actives.

Is this safe for sensitive skin? Glycolic acid is generally the least forgiving AHA for reactive skin; the brand's own gentler Lactic Acid sibling is the more sensible starting point if you know your skin reacts easily.

Do I really need sunscreen if I only use this at night? Yes — glycolic acid's effect on sun sensitivity persists into the following day, not just the hours right after application.

AHA (Alpha Hydroxy Acid)

A family of water-soluble acids, including glycolic and lactic acid, that exfoliate by loosening the bonds between dead skin cells.

Desmosome

The protein "glue" that holds skin cells together; AHAs work by dissolving these bonds.

PIH

Post-Inflammatory Hyperpigmentation — flat brown marks left after inflammation, caused by excess melanin.

PIE

Post-Inflammatory Erythema — flat red/pink marks from damaged capillaries, not pigment-based.

Free Acid Value

The percentage of an acid that is actually active (un-neutralized) at a given pH — determines real-world strength more than the label percentage alone.

Barrier (Skin Barrier)

The outermost skin layer that holds in moisture and keeps out irritants; damaged by over-exfoliation.

PAO

Period After Opening — the printed open-jar symbol showing how many months a product stays good for once opened.

FA-Safe

Fungal Acne Safe — free of ingredients known to feed Malassezia yeast that can trigger fungal acne breakouts.

Skin Cycling

A 4-night rotation alternating exfoliation, retinoid, and recovery nights to avoid over-stacking actives.

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: Someone with an already-intact barrier and a real SPF habit who wants faster, more even surface renewal for texture and dullness than a gentler AHA delivers, and who is comfortable following a scheduled (not daily) routine.

Key benefits: Smallest AHA molecule for fast, even exfoliation; genuinely fragrance-free and FA-safe formula; real hydrating/soothing support ingredients rather than a bare acid solution; a same-brand gentler sibling exists if it turns out to be too much.

Keep in mind: Not disclosed pH means tolerance can't be predicted from the label; not appropriate for a currently compromised barrier or reactive/sensitive skin; requires genuine SPF discipline once you use it at all.

Assessment: Not Suitable / Consult Oncologist. While this formula is fragrance-free and retinoid-free, active chemical exfoliation is generally not appropriate for skin sensitized by chemotherapy or radiation — treatment-affected skin is thinner and more reactive, and the same acid mechanism that helps typical skin can cause disproportionate irritation on compromised skin.

If you are in active cancer treatment and want texture support, a fragrance-free barrier cream without active acids is the safer starting point — ask your care team directly rather than self-selecting an exfoliant.

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

Quick version: Week 1-2, introduce alone at 1-2x/week and monitor closely. Week 3-4, increase to 2-3x/week if stable. Week 5+, add one support product only if genuinely needed. If irritation occurs at any point, use the 72-Hour Barrier Reset above rather than repeating this table.

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

Antioxidant pollution defense: Tocopherol (Vitamin E) appears in the declared INCI, offering some antioxidant support against free-radical stress — though at an estimated sub-1% concentration, treat this as a minor supporting benefit, not this product's primary function.

AC/humidity swing interaction: The humectants in this formula (Sodium Hyaluronate) can pull moisture from your own deeper skin layers rather than the air during long air-conditioning exposure. Always seal this serum with a real moisturizer, especially if you work or sleep in AC for extended hours.