NINE LESS Molecule-Clear Salicylic Acid Serum 30ml

Values You Can Trust: 100% Genuine (Adilsons policy) • FA-Safe* • Fragrance-Free • Halal-Friendly* • Vegan-Friendly*. Reef-safety and Wudu-compatibility badges are covered in their own sections below rather than summarized here, since both need a short explanation to be honest.

If you've been chasing "deep pore clearing" with scrubs or strong acids and just end up redder and shinier, this product's whole pitch is the opposite: a dose low enough to use most days, aimed at not undoing itself with irritation.

Pros: genuinely gentle enough for daily use; fragrance-free; lightweight, non-sticky finish reviewers describe as comfortable under makeup or sunscreen; simple 18-ingredient formula with no obvious Malassezia-feeding ingredients. Caveats: 0.15% is a low dose — if you need visible blackhead/texture improvement fast, expect this to work slowly rather than dramatically; pH is not publicly disclosed, so the exact free-acid strength can't be independently confirmed; no large-scale clinical study was found behind the "clears pores" marketing claim.

Classification: YELLOW — usable from roughly age 14+ with guidance. Salicylic Acid is a genuine chemical exfoliant that loosens the keratin "glue" holding dead skin cells together inside the pore lining — a real biological process, even at a low 0.15% concentration, and one that pre-teen skin (which produces far less sebum and has fewer congested pores to begin with) generally doesn't need to interrupt. This is not a RED/clinical-strength classification — 0.15% is well below typical "strong BHA" ranges — but it is still an active, not a plain hydrator, so a first-time teen user should patch test and start at 2-3x/week rather than daily.

This product is not marketed with youth-targeted packaging or characters, so there is no packaging-trap concern to flag here.

Bedside-compatible: yes, no sink or rinsing required. Requires precise dosage: no — 2-3 drops is forgiving. Requires wait time: a short one (see Quick Start) before moisturizer, but it isn't a multi-step ritual.

Can it anchor a single-product routine: not ideally on its own — it treats pores but does nothing for hydration or sun protection. On a genuinely low-energy day, pair it with just a moisturizer and (in daylight hours) sunscreen, and skip everything else.

Sensory note: reviewers consistently describe this as lightweight and non-sticky, which matters on low-energy nights when a heavy, tacky serum is the thing that gets skipped entirely.

Step 1 (When): AM or PM, most people find PM simpler. Step 2 (How much): 2-3 drops for the full face, applied with clean hands. Step 3 (How): Pat gently into clean, dry or slightly damp skin, avoiding the eye area; wait roughly 1-3 minutes before your next step so the acid isn't immediately diluted or buffered by a following layer.

"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 feels oily on waking)
2. Hydrating toner (optional)
3. NINE LESS Molecule-Clear Salicylic Acid Serum, 2-3 drops, wait 1-3 minutes
4. Niacinamide serum if using (different pathway, layers fine)
5. Moisturizer
6. Sunscreen SPF50+ PA++++ (non-negotiable if you use this AM, even indoors most of the day, since Mauritius UV is intense year-round)

Mauritius humidity note: in a humid morning, a humectant-forward moisturizer after this serum performs better than a heavy occlusive — the air itself is already supplying moisture for glycerin/hyaluronic acid to draw in, so you don't need a thick seal to stop water loss.

1. Double cleanse if wearing sunscreen/makeup
2. Toner (optional)
3. NINE LESS Molecule-Clear Salicylic Acid Serum on dry skin, wait 1-3 minutes
4. Any non-conflicting soothing serum
5. Moisturizer

Skin cycling placement: this product occupies the Exfoliation lane. On a 4-night cycle: Night 1 this BHA serum, Night 2 a retinoid (if you use one), Nights 3-4 recovery (barrier serum + moisturizer only, no actives).

Technique: pat or press into skin rather than rubbing — friction on an acid-treated surface increases irritation risk without improving absorption. Required skin state: clean, dry or lightly damp skin; avoid applying over broken or actively flaking skin. Wait time: 1-3 minutes before the next step, since Salicylic Acid needs a short window at the skin surface before being diluted by a following layer.

Hands vs. cotton pad: hands deliver 100% of the product; cotton pads absorb approximately 30-40% of it, so use hands for this serum rather than swiping it on with a pad.

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 → thickest, water-phase before oil-phase, treatments before seals. Wait-time defaults: watery layers 10-20s, serum layers 30-60s, sunscreen 10-15 min before going outdoors.

Default amounts: watery toner 5-8 drops; serum 2-3 drops or 1 pump; eye product ½ rice-grain per eye; gel moisturizer 1-1.5 peas, cream 1-2 peas; sunscreen the 2-finger rule for the face. Hard cap: if the routine pills, stings, or feels heavy, reduce layers rather than pushing through.

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, pick one (optional)
8. Pigment support lane, pick one (optional)
9. Hydration serum lane (optional)
10. Oil-control/sebum lane — this is where the anchor BHA serum sits if used AM
11. Peptides/repair lane (optional)
12. Eye product (optional)
13. Moisturizer
14. Optional sealing layer (AC/dry 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 BHA serum] — apply on dry skin, wait 1-3 minutes
9. Targeted serum, only if non-conflicting (optional)
10. Moisturizer
11. Sleeping mask (optional, dry/dehydrated nights)
12. Occlusive seal (optional, avoid if clog-prone)
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 (closing 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 tier — apply it after any watery toner/essence layers and before your moisturizer, in line with the water-phase-before-oil-phase rule. It is a single-phase water solution (no oil or silicone phase), so there's no shake-before-use step and no separation to worry about.

Rest days: at 0.15% most skin tolerates daily use, but if you're layering it with another active (retinoid, another acid, Vitamin C), alternate nights rather than running both together every day. Overuse warning: exceeding once-daily does NOT produce faster pore-clearing — it produces barrier damage, since even a low-dose BHA is still stripping the same lipid-and-corneocyte "glue" every application.

Purging vs. reaction: PURGING shows up in your usual breakout zones, stays surface-level, and resolves within 4-6 weeks — this can happen as a BHA speeds up turnover of congestion that was already forming. A REACTION shows up in new areas, involves burning, swelling, or hives, and gets worse rather than better — stop immediately if you see this.

Before starting this product, your routine MUST already include a gentle cleanser and a daily moisturizer — without those foundations, even a low-dose acid can tip a already-dry or already-irritated barrier into worse irritation.

Barrier gate: if your skin stings when you apply moisturizer, feels tight within 30 minutes of cleansing, or shows visible flaking, your barrier is below threshold for any active — repair it first with a plain barrier cream such as Dr.Althea 147 Barrier Cream before adding this serum back in.

Clogged pores/blackheads: Salicylic Acid is lipophilic (oil-loving), so unlike water-soluble AHAs it can actually travel into the sebum inside a pore and loosen the debris lining it from within, not just exfoliate the surface. Surface texture: secondary benefit from the same keratolytic mechanism working on dead skin cells across the whole face, not just inside pores. What this product cannot do: it cannot physically shrink pore size (pores don't have muscles to contract — only look smaller when less congested), cannot remove blackheads permanently in one use, and cannot substitute for extractions on deeply impacted, hardened comedones.

Every pairing below is verified currently in stock at Adilsons at the time of writing (stock changes constantly — one primary pick plus three alternatives per role, so you have options if any single SKU sells out).

Sunscreen (primary): NINE LESS Essentials UV Shield Soothing Sun Cream SPF50+ PA++++ — same brand, Cica-soothed, pairs naturally with a BHA that can leave skin slightly more UV-reactive. Alternatives: Beauty of Joseon Relief Sun: Rice + Probiotics, SKIN1004 Centella Hyalu-Cica Water-Fit Sun Serum, Anua Heartleaf Silky Moisture Sun Cream.

Barrier moisturizer (primary): Dr.Althea 147 Barrier Cream — a real 5-ceramide complex to offset any dryness from daily BHA use. Alternatives: REAL BARRIER Extreme Cream Light, ETUDE SOONJUNG 2X Barrier Intensive Cream, Anua 3 Ceramide Panthenol Moisture Barrier Cream.

Niacinamide/oil-control serum (primary, non-conflicting different pathway): Anua Niacinamide 10% + TXA 4% Serum. Alternatives: TIRTIR Niacinamide 20% Serum, Beauty of Joseon Glow Serum: Propolis + Niacinamide, ROUND LAB Vita Niacinamide Dark Spot Serum.

Gentle cleanser (primary): ROUND LAB 1025 Dokdo Cleanser. Alternatives: Anua 8 Hyaluronic Acid Moisturizing Gentle Gel Cleanser, COSRX Low pH Good Morning Gel Cleanser, JUMISO Pore-Purifying Salicylic Acid Cleanser (a wash-off 0.5% BHA cleanser — adds a second, gentler acid contact point rather than layering another leave-on acid).

Pilling note: this serum is water-thin and low in film-forming polymers, so it rarely causes pilling on its own; pilling is more likely if you stack multiple thick creams or silicone-based sunscreens on top without waiting between layers.

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 per routine (Retinoid OR Acid Exfoliation OR L-Ascorbic Acid Vitamin C OR Benzoyl Peroxide OR strong acne lane). 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.

× Retinoids (Retinol/Retinal/Tretinoin/Adapalene): avoid the same night for most people. Instead: BHA on non-retinoid nights, or AM BHA / PM Retinoid split. Very oily, resilient skin may tolerate combining as an advanced move only.

× L-Ascorbic Acid (pure Vitamin C): avoid layering in the same routine — excess acidity increases stinging and barrier irritation risk. Instead: Vitamin C AM / this BHA serum PM, or if insisting on same-routine use, Vitamin C first, wait 15-20 minutes, then the BHA.

× Another AHA/BHA product (separate serum, not a combined formula): avoid stacking two separate strong exfoliants — alternate days instead (this BHA one night, an AHA like the brand's own Molecule-Clear Glycolic/Lactic/Mandelic serums another night).

× Copper peptides: avoid immediate layering — low pH from the acid can destabilize peptide bonds. Instead: peptides AM, this serum PM, or wait 20 minutes after the acid before applying peptides.

Section 15C — Scheduling Templates:

Template A (AM/PM Split): AM Antioxidant lane (Vitamin C) → Moisturizer → SPF; PM this BHA serum → Moisturizer.

Template B (4-Night Skin Cycling): Night 1 this BHA serum; Night 2 Retinoid; Nights 3-4 Recovery (no actives).

Template C (Alternate-Night, simpler): Mon/Wed/Fri Retinoid; Tue/Sat this BHA serum; Thu/Sun Recovery.

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

Pre-period breakouts happen because progesterone causes the pore lining to physically swell, narrowing the opening and trapping sebum beneath — this is exactly the mechanical problem a BHA is suited to, since it works from inside the pore rather than only on the surface.

Water-Permeable (wudu-compatible). This is a water-thin, fast-absorbing serum with no film-forming or occlusive ingredients of note — it does not sit on the skin as a barrier layer the way a heavy cream or SPF might. Water should still reach the skin normally during wudu once the product has absorbed.

"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: "A higher BHA percentage always works better/faster." REALITY: higher concentrations increase irritation risk faster than they increase benefit past a certain point — a low, consistently-used dose like 0.15% can outperform a high dose used inconsistently because you skip it less.

MYTH: "BHA physically shrinks your pores." REALITY: pores have no muscle to contract; a BHA reduces the debris that makes a pore look stretched and visible, which is a real, different effect from actually changing pore size.

MYTH: "You need to feel a tingle for it to be working." REALITY: tingling is a sign of the acid contacting skin, not a measure of efficacy — a low-dose product like this one is specifically designed to work without that sensation for most users.

In air-conditioned environments, the Sodium Hyaluronate and Glycerin in this formula can draw moisture FROM your deeper skin layers instead of from the air if left unsealed. Follow with a proper moisturizer when spending extended hours in AC, especially on nights you use this serum.

Hard water note: Mauritius tap water hardness varies by region; if you notice extra tightness after cleansing before this serum, a pH-adjusting toner beforehand can help counteract the calcium-stearate residue hard water leaves on skin.

*Moderate rather than Strong: the BHA mechanism itself is well-established in dermatology, but at 0.15% this is a low dose relative to typical studied ranges (0.5-2%), so expect a gentler, slower-acting effect than the ingredient's general reputation implies.

Full INCI list (sourced via cross-referenced retailer listings — Boozyshop, International-Cosmetic, Kiyo Beauty, YesStyle, StyleKorean, Jolse, Everything Beauty GH, and skinsort.com; direct brand-site/INCIDecoder fetch was not accessible from this environment, so treat this as medium-confidence rather than a single-source primary read):

Aqua (Water), Butylene Glycol, Dipropylene Glycol, Glycerin, 1,2-Hexanediol, Betaine, C12-14 Pareth-12, Panthenol, Polyacrylate Crosspolymer-6, Arginine, [--- Estimated 1% Line ---] Salicylic Acid, Sodium Hyaluronate, Allantoin, Xanthan Gum, Ethylhexylglycerin, Disodium EDTA, t-Butyl Alcohol, Citric Acid.

Free Acid Value: pH not publicly disclosed by the brand or found in any source checked — we cannot state a free-acid percentage without inventing a number, so treat the 0.15% total concentration as the only verified figure.

Preservative system: 1,2-Hexanediol and Ethylhexylglycerin (a glycol/glycerin-ether preservative-booster pairing) plus Disodium EDTA (chelator) — a paraben-free, phenoxyethanol-free system.

Fragrance status: Fragrance-Free — no Parfum/Fragrance appears anywhere in the declared INCI. Scent: no detectable scent expected from this ingredient list. EU 26 allergen screen: none detected in the declared INCI.

Alcohol disclosure: t-Butyl Alcohol appears near the end of the list (position 17 of 18) — likely present as a trace-level solvent/preservative-booster rather than a primary drying agent, but flagged since it is a genuine short-chain alcohol, distinct from moisturizing fatty alcohols like Cetyl or Stearyl Alcohol. Extremely alcohol-sensitive users should patch test.

Aspirin/salicylate sensitivity: if you have a known aspirin allergy or salicylate sensitivity, Salicylic Acid is chemically related and topical use carries a small but real cross-reactivity risk — patch test first and consult your doctor if you have a history of salicylate reactions.

Prescription interactions: if you are currently using prescription tretinoin, adapalene, or isotretinoin, introduce this serum cautiously and on alternate nights rather than layering — combining oral isotretinoin with topical BHA in particular can compound dryness and irritation.

Halal status: *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 status: *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 status: No formal Leaping Bunny or PETA Beauty Without Bunnies listing was found for NINE LESS during brand research. *Not independently certified by a third-party cruelty-free audit; treat as unconfirmed rather than brand-stated, since we could not even find a brand-stated cruelty-free claim to caveat.

Microplastic status: Partial — the formula contains Polyacrylate Crosspolymer-6, a synthetic thickening/stabilizing polymer. Some strict environmental definitions flag polyacrylate crosspolymers as microplastic-forming, particularly in rinse-off contexts; this is a leave-on product used in small volume, but we won't claim a flat "microplastic-free" given this ingredient is present.

MFDS classification: General Cosmetic — no evidence of Functional Cosmetic registration (the additional Korean government testing tier) was found for this SKU during research.

Clinical evidence: no institution-run clinical trial, sample size, or published study was found specifically behind this product's "clears pore congestion" marketing claim. *Evidence Confidence: Marketing-Only for the specific product claim — the underlying Salicylic Acid keratolytic mechanism itself is well-established dermatological science, but this product's own claims have not been independently clinically tested as far as our research found.

Fungal Acne Safety: FA-Safe. Cross-referencing the full INCI against common Malassezia-feeding ingredient lists (fatty esters, polysorbates, most fatty alcohols/acids in the mid-chain-length range) turned up none of the usual culprits — the closest ingredient, C12-14 Pareth-12, is a PEG-type ether surfactant rather than a fatty ester, and is not flagged on standard FA-safety references. An independent reviewer (DermApproved) reached the same conclusion, describing the base as free of oils or known Malassezia-feeding ingredients.

Assessment: Low. As a water-thin serum with minimal film-forming polymers, this product rarely balls up under following layers. Pilling is more likely to come from whatever you layer after it — a thick sunscreen or silicone-heavy primer applied without a wait — rather than from this serum itself.

Mitigation: apply to slightly damp skin, wait the full 1-3 minutes, and pat (don't rub) subsequent layers on.

Color baseline: expect a clear to very lightly tinted watery liquid; a notable color shift (yellowing, browning) or a new off smell are both spoilage signs, not normal aging. Storage: keep out of direct sun and away from bathroom shelf humidity swings where possible — a bedroom drawer or cabinet is more stable in Mauritius's heat and humidity than a steamy bathroom.

Spoilage signs: color change, separation that won't remix, an off/sour smell, or a sudden increase in stinging on skin that previously tolerated it well. When in doubt, discard.

Patch test: apply a small amount to your inner forearm, wait 24 hours; if clear, apply behind the ear, wait another 24 hours; only then begin facial use.

"If 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 discontinue use.

Pregnancy note: 0.15% Salicylic Acid is well below the commonly cited pregnancy-caution threshold of 2%, and this concentration is not flagged as unsafe by mainstream guidance — but if you are pregnant or nursing and prefer to avoid all leave-on BHA/AHA products out of caution, that is a reasonable choice; discuss with your obstetrician if unsure.

1. Expecting fast, dramatic results from a deliberately low 0.15% dose — this is a maintenance product, not a peel.
2. Layering it with another leave-on acid every single night instead of alternating.
3. Skipping SPF on days you use it, assuming a "gentle" product carries no photosensitivity consideration.
4. Rubbing it in vigorously to "help it work faster" — friction increases irritation, not efficacy.
5. Applying it over visibly broken, flaking, or actively inflamed skin.

Overuse threshold: daily use is generally well tolerated at this concentration; the specific consequence of going beyond once-daily is barrier stripping, not faster results.

Phone hygiene note: for acne-prone users, regularly wiping down your phone screen reduces one common bacterial-transfer vector that can undercut any topical acne routine, including this one.

Usage math: at roughly 2-3 drops per application, a 30ml bottle holds a substantial number of uses. Lifespan: used once daily, expect the bottle to last several months; overdosing at 2-3x the recommended amount per use shortens this proportionally without improving results. Reorder timing: keep an eye on the remaining volume and plan to reorder roughly two weeks before you expect to run out, to allow for delivery time.

This serum's job is narrow and specific: keep pores physically clear of the sebum-and-dead-skin plug that causes blackheads and congestion, at a dose gentle enough to run most days. It sits in the water-thin, exfoliation-lane position of your routine — after toners/essences, before moisturizer.

AM: Cleanser (optional) → this serum, 2-3 drops, wait 1-3 min → Niacinamide serum if used → Moisturizer → Sunscreen SPF50+. PM: Cleanse → this serum, 2-3 drops, wait 1-3 min → Moisturizer.

If your barrier is currently compromised (stinging on moisturizer, visible flaking): pause this serum and use only a gentle cleanser + Dr.Althea 147 Barrier Cream + SPF for 3-7 days before restarting at a lower frequency. If you're in air conditioning most of the day: follow this serum with a proper moisturizer rather than relying on its own light hydrators to hold water in.

If you're also using a prescription retinoid: run this serum and the retinoid on separate nights, not layered together. If you want a stronger BHA once you've built tolerance: see the Graduation Pathway below.

Stock-true bundle — Daily Congestion Control: this serum + Dr.Althea 147 Barrier Cream + NINE LESS Essentials UV Shield SPF50+ — apply the serum PM, the barrier cream AM+PM, the sunscreen every AM.

Stock-true bundle — Two-Step Acid Approach: JUMISO Pore-Purifying Salicylic Acid Cleanser (0.5% wash-off BHA) + this leave-on serum + Anua Niacinamide 10% + TXA 4% Serum — cleanser AM/PM, this serum PM, niacinamide serum AM.

"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 Salicylic 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've already built tolerance to daily leave-on BHA and want a stronger single dose rather than daily maintenance, COS DE BAHA Salicylic Acid 4% Serum is in stock at Adilsons and delivers a much higher-concentration BHA in the same 30ml serum format — a real trade-off between strength and daily wearability, not a straightforward "better" option.

Choose NINE LESS Molecule-Clear Salicylic Acid Serum over COS DE BAHA 4% if you need: a low-irritation-risk BHA you can genuinely run every day without building in rest days, or you're new to leave-on acids and want a safe starting dose.

Upgrade triggers (IF/THEN): IF you've used this 0.15% serum daily for 8+ weeks with zero irritation and still see visible congestion, THEN COS DE BAHA 4% is a reasonable step up. IF you have persistent, hardened blackheads that haven't responded to daily low-dose use, THEN a higher concentration may help — but consider a professional extraction first. IF your barrier is currently compromised in any way, THEN do not upgrade yet — repair barrier first, regardless of how long you've used the low dose.

Timing and lane: both products occupy the same Exfoliation lane — never run both in the same routine; pick one as your primary BHA. AM or PM is fine for either, with the same conflict rules as detailed in the Conflict Solver above.

Don't upgrade if: your barrier isn't consistently healthy; you can't commit to daily SPF; you're already running another acid or retinoid most nights; you're new to leave-on actives in general.

Decision close: if you match two or more upgrade triggers above, the 4% option is worth considering. If not, this 0.15% serum is sufficient and safer — consistency beats complexity.

This product sits at the gentle, daily-maintenance end of a real strength ladder within Adilsons' own BHA catalog: wash-off entry point (JUMISO Pore-Purifying Salicylic Acid Cleanser, 0.5%, rinsed off) → this leave-on serum (0.15%, daily) → higher-strength leave-on serum (COS DE BAHA Salicylic Acid 4% Serum, for established tolerance, not daily). Move up the ladder only after weeks of demonstrated tolerance at the current step, not on a fixed schedule.

This product's PRIMARY function is: low-dose daily BHA exfoliation for pore congestion. You do NOT need this if you already own a leave-on Salicylic Acid or other BHA/AHA serum you use daily and haven't finished — use up what you have before adding a duplicate to the same lane.

Check your current routine for another product with Salicylic Acid, Betaine Salicylate, or another BHA as a named active before purchasing. PAO (once opened) means buying a second bottle while the first sits unused past its window is waste, not a backup.

Stacking assessment: against another BHA product — No Benefit (same mechanism, redundant). Against a niacinamide or barrier product — Significant Benefit (different pathway entirely).

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: confirm the batch/lot code printed on the carton matches the one on the bottle itself, and that the dropper/cap seal is intact and untampered on first opening. If anything looks off, our Authenticity page covers the fuller verification process.

NINE LESS positions itself as a dermatologist-adjacent, single-active-per-product Korean skincare brand — each SKU is built around one named acid or active rather than a "kitchen sink" multi-active formula. The Molecule-Clear line applies that same philosophy to exfoliation specifically: rather than one blended AHA/BHA/PHA toner, the brand sells four separate single-acid serums (Glycolic, Lactic, Mandelic, Salicylic) so a customer can pick the exact acid chemistry their skin responds to, at concentrations the brand pitches as gentle enough for regular use.

No Reddit-specific community thread (r/AsianBeauty, r/SkincareAddiction) was found for this exact SKU at the time of writing — we're not going to invent one to fill this section. What we did find, via an independent K-beauty review site (DermApproved), paraphrased rather than quoted verbatim: reviewers there describe the serum as comfortable and non-drying enough for daily use on both oily and sensitive skin, with a lightweight, non-sticky finish. The same coverage is candid about the trade-off: because 0.15% is an unusually low BHA dose, results are described as slow and modest rather than dramatic, and reviewers note the strength feels more entry-level than the price point might suggest.

Common praise theme: gentle, daily-wearable, non-irritating. Common complaint theme: slow/modest results at this concentration, better suited to maintenance than to visibly stubborn congestion.

Sustainability: check the bottle material for local recyclability (glass and most PET plastics are typically accepted in Mauritius's general recycling streams); no refill program was found for this product during research.

Is 0.15% Salicylic Acid actually strong enough to do anything? Yes, but modestly and gradually — it's a genuine active dose, just a low one, designed for daily maintenance rather than fast, dramatic pore-clearing.

Can I use this every day? Most people tolerate daily use at this concentration; start at 3-4x/week if you're new to BHA and increase from there based on how your skin responds.

Can I combine it with my retinol? Not in the same routine — alternate nights or split AM/PM. See the Conflict Solver section above.

Is it fragrance-free and safe for sensitive skin? Yes, fragrance-free by INCI, and the low dose makes it a reasonable starting point for sensitive skin with a patch test first — but any active can still irritate compromised skin.

Is it fungal-acne safe? Based on our INCI cross-reference and independent review coverage, yes — no common Malassezia-feeding ingredients were identified.

BHA (Beta Hydroxy Acid)

An oil-soluble acid — Salicylic Acid is the common cosmetic form — that can travel inside oil-filled pores, unlike water-soluble AHAs which mainly work on the surface.

Keratolytic

Loosens the "glue" (desmosomes) holding dead skin cells together, allowing them to shed more easily.

Comedone

A clogged pore — "closed" (whitehead) if covered by skin, "open" (blackhead) if exposed to air and oxidized dark.

Free Acid Value

The percentage of an acid that is actually active/available at the formula's pH, as opposed to the total labeled percentage.

Purging

A temporary increase in breakouts in your usual problem areas as an active speeds up turnover of congestion that was already forming.

Fungal Acne (Malassezia folliculitis)

Small, uniform, itchy bumps caused by yeast overgrowth, often mistaken for acne — triggered by different ingredients than bacterial acne.

PAO (Period After Opening)

The number of months a product remains safe/effective to use after first opening, shown as an open-jar icon with a number on the packaging.

Skin Cycling

Rotating actives (exfoliant, retinoid, recovery nights) across a multi-night cycle instead of using all actives every night.

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 who wants a low-drama, everyday BHA to keep pore congestion in check without the irritation and rest-day planning a stronger acid requires — especially good as a first leave-on exfoliant or for sensitive-leaning skin that hasn't tolerated stronger BHAs well.

Key benefits: genuinely daily-wearable at 0.15%; fragrance-free with a clean, FA-safe 18-ingredient formula; lightweight, non-sticky texture that reviewers consistently praise; simple enough to slot into an existing routine without restructuring it.

Keep in mind: this is a slow, maintenance-level product, not a fast-acting treatment — if you need visible results on stubborn congestion quickly, a higher-strength BHA (see Graduation Pathway) will get there faster, at the cost of needing more careful scheduling; pH is not publicly disclosed, so the exact free-acid activity can't be independently confirmed.

Assessment: Consult Oncologist. This formula itself is fragrance-free, retinoid-free, and runs a minimal, modern glycol-based preservative system — all favorable on paper — but it is still an active chemical exfoliant, and chemotherapy- or radiation-sensitized skin typically has reduced barrier function and heightened reactivity to any exfoliating acid, even at a low 0.15% dose. That combination is why this needs a direct conversation with your care team rather than a blanket "suitable" or "not suitable" answer.

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

Quick version: Week 1-2, introduce alone at 2-3x/week and monitor for irritation. Week 3-4, increase to daily if skin stayed calm.

Week 5+, add one supporting product (niacinamide, barrier cream) only if genuinely needed. If irritation appears at any point, follow 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."

AC/humidity swing interaction: this formula carries Glycerin and Sodium Hyaluronate as its main hydrators, both genuine humectants. In outdoor Mauritius humidity they perform well, pulling ambient moisture toward skin.

In extended air-conditioned environments — an office, a car, an AC-cooled bedroom overnight — the same humectants can instead pull moisture from your own deeper skin layers if left unsealed. Follow with a proper moisturizer on any day or night you'll be in AC for extended hours after using this serum.