COSRX: opinion and scientific analysis of the range
Snail mucin, peptides, BHA - tops, flops and BeautyDecoded data
Article written by Dr Sylvain David - Plastic and aesthetic surgeon - Updated: March 2026
This content is for informational and educational purposes only. It does not constitute a medical consultation. BeautyDecoded application allows you to choose cosmetics adapted to your skin type thanks to artificial intelligence.
COSRX products - BeautyDecoded overview
| Product | Note BeautyDecoded | Notice (n) | Verdict |
| Advanced Snail 96 Mucin Essence | 4,01 / 5 | 46 | ~22 € - TOP repairer (46 reviews, larger volume) |
| The 6 Peptide Skin Booster Serum | 5,00 / 5 | 9 | ~35 €/150 ml - TOP anti-aging 83.3 |
| Ultra Light Sunscreen SPF50+ | 4,63 / 5 | 8 | ~20 € - TOP SPF, sensitivity +1.0 |
| Propolis Synergy Toner | 4,63 / 5 | 8 | ~22 €/150 ml - Imperfections 78.2 (DISCOVERY) |
| BHA Blackhead Power Liquid | 5,00 / 5 | 5 | ~25 €/100 ml - TOP BHA K-beauty |
| Balancium Comfort Ceramide Cream | 4,50 / 5 | 2 | ~25 € - Redness 81.6 (DISCOVERY) |
| Hydrium Centella Soothing Ampoule | 5,00 / 5 | 2 | ~25 € - Sensitivity +2.0 (DISCOVERY) |
| Advanced Snail Peptide Eye Cream | 4,42 / 5 | 12 | ~28 € - Anti-ageing 78.2, redness 76.5 |
| The Vitamin C 23 Serum | 4,25 / 5 | 2 | ~28 € - Anti-aging + spots 90.1 (DISCOVERY) |
| Low pH Gel Cleanser | 4,67 / 5 | 6 | ~12 € - TOP for oily skin, contraindicated for dry skin |
| Advanced Snail 92 All in One Cream | 4,13 / 5 | 24 | ~20 € - Dry skin score 50,4 disappointing |
| Attention: Ultimate Nourishing Rice Overnight Mask | 4,27 / 5 | 11 | ~22 € - Stains 76.5 but contradictory nourishing promise |
Note on BeautyDecoded reviews: the ratings and review excerpts displayed on this page come from users of the BeautyDecoded application. These reviews are not verified. Publication dates and review details are available on each product sheet.
Snail mucin - biochemistry and documented properties
Snail mucin is COSRX's signature active ingredient. Its complex biochemical composition gives it the following properties multiple and complementary - healing, moisturizing, gentle exfoliation and firming support.
| Component | Biological function | Cosmetological benefits |
| Allantoin | Stimulates cell proliferation, healing | Repair damaged skin, reduce scars |
| Glycolic acid (traces) | AHA - gentle desquamation | Light textured smoothing |
| Structural proteins | Collagen and elastin precursors | Supports skin firmness |
| Glycoproteins | Cell adhesion, moisturizing film | Surface hydration, barrier support |
| Proteolytic enzymes | Degradation of denatured proteins | Gentle enzymatic exfoliation |
«Topical peptides are the anti-aging active I recommend alongside retinol for patients who want to maximize their routine without over-exfoliating. The studies on signal peptides and neurotransmitter inhibitors are solid over 12 weeks.»
COSRX reviews and analysis - product by product
The 6 Peptide Skin Booster Serum - TOP
5/5 5.00/5 - 9 opinion BeautyDecoded | Price : ~35 € / 150 ml | Range : Peptide
BeautyDecoded algorithmic scores
| Profile / Issues | Score |
| Dry skin | 77.0 |
| Oily skin | 91.0 |
| Normal to dry skin | 82.6 |
| Normal to oily skin | 91.0 |
| Sensitive skin | -0.5 |
| Anti-aging | 83.3 |
| Imperfections | 12.8 |
| Redness | 25.5 |
| Stains | 34.0 |
Verdict Sensitivity (Dr David rule) : Slight caution recommended (score: -0.5)
Expert deciphering
6 peptides covering several families (signalers, neurotransmitter inhibitors, transporters) + niacinamide + amino acid pool. Anti-ageing score: 83.3 - the highest in the COSRX catalog. Perfect BeautyDecoded score (5/5 out of 9 reviews). Oily skin score: 91 and normal to oily skin score: 91 - optimal profile. Sensitive skin score: -0.50 - slight caution, well tolerated in practice (mature atopic skin confirmed in reviews).
Remarkable note in the reviews: a user with dry ultra-thin mature atopic skin confirms a «real anti-aging effect» over several months. The «glowy» effect reported is consistent with the action of niacinamide (radiance, light anti-dark spot). The 150 ml format at €35 is exceptional for a multi-peptide serum - allowing generous use without reasoning about dosage. Confirmed «liquid like water» texture.
Dry skin score: 77 - slightly less optimal than for oily skin. The formula is more of an aqueous serum than a cream - always superimpose a moisturizing cream on dry skin after application. Imperfections score: 12.75 - moderate, consistent with an anti-aging serum that does not correct imperfections.
My analysis
«6 Peptide Skin Booster is the best COSRX serum - rated 5/5 out of 9 reviews, anti-aging score 83.3 (the highest in the catalog), 150 ml at €35 (exceptional Q/P ratio). Tolerance on mature atopic skin confirmed. Use as a base serum or in addition to retinol in the evenings without exfoliation.»
Verdict: TOP - Rating 5/5. Anti-ageing 83.3 (best in catalog). 150 ml/€35: exceptional Q/P ratio. Oily skin 91. Confirmed tolerance for atopic skin.
BeautyDecoded user reviews (9 reviews in total)
5/5 «The pump is a real plus and the large capacity is appreciated. I will repurchase.»
5/5 «Ultra-fluid, moisturizing texture that enhances the effectiveness of the following treatment.»
5/5 «Mature dry atopic skin: I tolerate it very well. I feel that the peptides have a real anti-aging effect.»
5/5 «Gives a natural glow. Can be mixed with foundation. Fits me perfectly.»
5/5 «Liquid like water. No immediate anti-aging effect - more preventive. Pleasant and finishes glowy.»
Ultra Light Invisible Sunscreen SPF50+ PA++++ - TOP SPF
5/5 4.63/5 - 8 opinion BeautyDecoded | Price : ~20 € / 50 ml | Range : Sun
BeautyDecoded algorithmic scores
| Profile / Issues | Score |
| Dry skin | 85.4 |
| Oily skin | 84.0 |
| Normal to dry skin | 91.0 |
| Normal to oily skin | 91.0 |
| Sensitive skin | 1.0 |
| Anti-aging | 48.5 |
| Imperfections | 29.8 |
| Redness | 4.3 |
| Stains | 27.2 |
Verdict Sensitivity (Dr David rule) : Suitable for sensitive skin (score : 1)
Expert deciphering
SPF50+ PA++++. Sensitive skin score: +1.0 - excellent for an SPF. Universal score (84-91 for all skin types). BeautyDecoded score: 4.63/5 out of 8 reviews. One user explicitly refers to BeautyDecoded 2024 in his review - a signal of external recognition. Modern chemical filters (Tinosorb, Uvinul): good UVA/UVB protection.
BeautyDecoded feedback unanimously confirms the light, non-greasy, transparent texture, with no white effect. Compatibility on sensitive skin with redness/rosacea confirmed in one review. Slight initial sticky sensation reported (dissipated quickly) in one review - to be managed in the meantime before applying makeup.
Redness score: 4.25 - modest, sensitive skin score +1.0 compensates. Colorless version without iron oxides - for melasma and hormonal hyperpigmentation, prefer a tinted version with iron oxides to block visible light. Anti-aging score: 48.45 - relevant for a functional SPF.
My analysis
«Ultra Light Invisible Sunscreen is the best SPF in the COSRX catalog - sensitive skin score +1.0, universal profile (84-91), rating 4.63/5. Light texture with no white residue unanimously confirmed. Modest redness score (4.25) offset by sensitivity score. Special case of melasma: tinted version preferable.»
Verdict: TOP - Sensitive skin score +1.0. Universal profile 84-91. Score 4.63/5. Invisible texture confirmed. Referenced in BeautyDecoded 2024.
BeautyDecoded user reviews (8 reviews in total)
5/5 «Purchased thanks to the BeautyDecoded video. Light, melting texture, fragrance-free and transparent. Sensitive skin with redness: TOP. I recommend to 100%.»
5/5 «Product in the top 2024 BeautyDecoded. Ultra fluid texture - you don't feel like you're applying sunscreen. Validated.»
5/5 «Pleasant and moisturizing, does not grease, does not whiten.»
4/5 «Fluid, a little sticky at first but the effect dissipates quickly. Very good for sensitive skin and rosacea.»
Advanced Snail 96 Mucin Power Essence - Repair Reference
4/5 4.01/5 - 46 opinion BeautyDecoded | Price : ~22 € / 100 ml | Range : Snail
BeautyDecoded algorithmic scores
| Profile / Issues | Score |
| Dry skin | 91.0 |
| Oily skin | 91.0 |
| Normal to dry skin | 91.0 |
| Normal to oily skin | 91.0 |
| Sensitive skin | -1.0 |
| Anti-aging | 49.3 |
| Imperfections | 76.5 |
| Redness | 49.3 |
| Stains | 34.0 |
Verdict Sensitivity (Dr David rule) : Slight caution recommended (score: -1)
Expert deciphering
96 % snail mucin filtrate. Perfect universal profile (91 on all types). Blemish score: 76.5 - the highest in the Snail catalog. Sensitive skin score: -1.0 - slightly cautious, but BeautyDecoded score 4.01/5 on 46 reviews - the highest in the COSRX catalog. Signal of diversity of experience on a statistically solid volume.
BeautyDecoded feedback (46 reviews) reveals a notable variability: «compatibility with all skin types» (positive review), «gives pimples» (isolated intolerance signal), «plum effect after application» (confirmed), «all-day hydration» (confirmed). Pimples (1 review out of 46) are a rare but documented phenomenon with mucin in certain acne profiles - watch out for this.
Redness score: 49.3 - relevant to the anti-inflammatory action of the allantoin present in mucin. Anti-aging score: 49.3 - moderate, consistent with a restorative essence, not a leading anti-aging serum.
My analysis
«Advanced Snail 96 Mucin Essence is the COSRX repair reference - universal profile (91 everywhere), blemish score 76.5, 46 BeautyDecoded reviews (the highest volume). Pimples reported in 1 review/46 - rare phenomenon to watch out for on very acne-prone skin. Not to be confused with a top-ranked anti-aging serum (anti-aging score 49.3).»
Verdict: TOP - Universal profile 91. Imperfections score 76.5. 46 reviews (largest catalog volume). Excellent Q/P ratio. 1/46 : buttons (rare).
BeautyDecoded user reviews (46 reviews in total)
5/5 «My favorite serum - freshness, all-day hydration. Very good for sensitive skin.»
5/5 «I love its texture and plum effect after application.»
4/5 «Very useful before applying an active serum. Prepares dry, mature skin well. Would recommend.»
3/5 «Great texture but gives me pimples. I don't know what ingredient causes this.»
Propolis Synergy Toner - TOP Anti-Redness
5/5 4.63/5 - 8 opinion BeautyDecoded | Price : ~22 € / 150 ml | Range : Propolis
BeautyDecoded algorithmic scores
| Profile / Issues | Score |
| Dry skin | 84.0 |
| Oily skin | 84.0 |
| Normal to dry skin | 91.0 |
| Normal to oily skin | 91.0 |
| Sensitive skin | 1.0 |
| Anti-aging | 49.3 |
| Imperfections | 78.2 |
| Redness | 76.5 |
| Stains | 20.4 |
Verdict Sensitivity (Dr David rule) : Suitable for sensitive skin (score : 1)
Expert deciphering
Propolis toner (antibacterial and anti-inflammatory hive extract). Sensitive skin score: +1.0 - excellent. Imperfections score: 78.2 and redness: 76.5 - relevant. BeautyDecoded score: 4.63/5 out of 8 reviews - one of the best scores in the COSRX catalog. Universal profile (84-91). This product was not in the source article - discovered via CSV.
BeautyDecoded feedback confirms: limited hormonal acne, accelerated healing, non-sticky, odorless texture, hydrated, plumped skin. Propolis (a resin produced by bees) has documented antibacterial, anti-inflammatory and healing properties. For greater effectiveness, we recommend the full propolis range.
Ideal use: after cleansing, before serums. The slightly viscous texture described in the reviews is characteristic of propolis. Particularly for dry skin: reported «non-drying» effect after cleansing - effective moisturizing skin preparation signal.
My analysis
«Propolis Synergy Toner is the discovery of the COSRX catalog - rating 4.63/5, sensitive skin score +1.0, blemishes 78.2 and redness 76.5. Not mentioned in source article. Antibacterial + anti-inflammatory action of propolis consistent with results on hormonal acne and scarring. Generous format (150 ml).»
Verdict: TOP - Score 4.63/5. Sensitive skin score +1.0. Blemishes 78.2, redness 76.5. Antibacterial/anti-inflammatory propolis. BeautyDecoded discovery.
BeautyDecoded user reviews (8 reviews in total)
5/5 «Propolis with anti-inflammatory properties - limits my hormonal acne and helps healing. Moisturized and plumped skin.»
5/5 «Excellent product. Does not stick, odorless. Deeply moisturized skin with plumping effect, no greasy effect.»
5/5 «Humectant lotion perfectly suited to dry skin. After cleansing, the skin no longer tautens and feels almost nourished.»
4/5 «Light, non-sticky, gives glow. Strongly recommends using the full propolis range.»
BHA Blackhead Power Liquid - TOP BHA K-beauty
5/5 5.00/5 - 5 opinion BeautyDecoded | Price : ~25 € / 100 ml | Range : BHA
BeautyDecoded algorithmic scores
| Profile / Issues | Score |
| Dry skin | 72.8 |
| Oily skin | 84.0 |
| Normal to dry skin | 72.8 |
| Normal to oily skin | 91.0 |
| Sensitive skin | -1.0 |
| Anti-aging | 72.3 |
| Imperfections | 76.5 |
| Redness | 0.0 |
| Stains | 17.0 |
Verdict Sensitivity (Dr David rule) : Slight caution recommended (score: -1)
Caution: BHA: start 2-3 evenings/week. SPF 50+ in the morning is mandatory. Do not combine with retinol on the same evening.
Expert deciphering
pH-calibrated BHA (salicylic acid) (~3.5-4) in a minimalist formula. Oily skin score: 84 and normal to oily skin score: 91 - optimal profile. Blemishes score: 76.5 - high. Anti-aging score: 72.25 - relevant for exfoliation (cell renewal). Perfect score (5/5 out of 5 reviews). Sensitive skin score: -1.0 - slight caution consistent with BHA.
Perfect score out of 5 BeautyDecoded reviews - small volume but remarkable unanimity. Feedback confirms effectiveness on imperfections with good tolerance (not very drying). One user reports a migration from Paula's Choice BHA - comparable performance signal with perceived better tolerance. Dry skin score: 72.8 - usable but less optimal.
Positioned as K-beauty's entry-level BHA - less formally documented than BHA 2% Lotion Paula's Choice (more precise pH), but more accessible and better tolerated by chemical exfoliation beginners. 100 ml format at €25: excellent Q/P ratio for an active BHA.
Source : Draelos ZD et al. Salicylic acid in the treatment of acne. J Am Acad Dermatol. 2004.
My analysis
«BHA Blackhead Power Liquid is the K-beauty reference BHA at COSRX - rating 5/5 out of 5 reviews, imperfections score 76.5, optimal oily skin profile (84-91). A user preferring this BHA to Paula's Choice is a signal of superior tolerance. Q/P ratio 100 ml/25 € excellent.»
Verdict: TOP - Rating 5/5. Imperfections 76.5. Oily skin 84-91. Transition from Paula's Choice reported. 100 ml/25 €: excellent Q/P ratio.
BeautyDecoded user reviews (5 reviews in total)
5/5 «Very good texture, not drying or irritating, effective on pimples.»
5/5 «I used to use Paula's Choice before. This lotion doesn't dry out - very good in comparison.»
5/5 «Improves the condition of my skin from day to day. Very pleasant even for dry skin.»
5/5 «Really effective. Be careful not to use it too frequently or in large quantities.»
Hydrium Centella Aqua Soothing Ampoule - TOP Rosacea
5/5 5.00/5 - 2 reviews BeautyDecoded | Price : ~25 € / 40 ml | Range : Hydrium
BeautyDecoded algorithmic scores
| Profile / Issues | Score |
| Dry skin | 84.0 |
| Oily skin | 84.0 |
| Normal to dry skin | 84.0 |
| Normal to oily skin | 91.0 |
| Sensitive skin | 2.0 |
| Anti-aging | 50.1 |
| Imperfections | 0.0 |
| Redness | 76.5 |
| Stains | 11.9 |
Verdict Sensitivity (Dr David rule) : Suitable for sensitive skin (score : 2)
Expert deciphering
Centella asiatica ampoule. Sensitive skin score: +2.0 - exceptional, among the highest in the COSRX catalog. Redness score: 76.5 - high. Universal profile (84-91). Perfect score (5/5 out of 2 reviews - insufficient statistical basis). This product was not in the source article - discovered via CSV.
The 2 BeautyDecoded reviews (5/5 each) confirm significant efficacy on rosacea: «acts significantly on redness», «ultra-moisturizing». One user explicitly suffers from rosacea. COSRX Centella Ampoule is positioned as a direct alternative to Madagascar Centella Ampoule Skin1004 (redness score 68 vs 76.5 here - COSRX advantage on this criterion).
Sensitive skin score +2.0: the best sensitivity score in the COSRX catalog. Fragrance-free, light texture, rapid absorption - characteristics confirmed by reviews. To be explored as a base treatment for rosacea sufferers looking for an alternative to Skin1004 centella.
My analysis
«Hydrium Centella Aqua Soothing Ampoule is the most notable discovery in the COSRX catalog - sensitive skin score +2.0 (best in catalog), redness 76.5. Not mentioned in the source article. Higher score than Ampoule Madagascar Centella Skin1004 (68 vs. 76.5) on redness. 2 insufficient but unanimous reviews on rosacea.»
Verdict: TOP - Sensitivity score +2.0 (best in catalog). Redness 76.5. Score 5/5. BeautyDecoded discovery. Redness score higher than Skin1004 Ampoule (76.5 vs 68).
BeautyDecoded user reviews (2 reviews in total)
5/5 «Rosacea: ultra-moisturizing and acts significantly on redness.»
5/5 «Light and pleasant, absorbs quickly. Fragrance-free, non-irritating.»
Advanced Snail Peptide Eye Cream - Contour des Yeux
4/5 4.42/5 - 12 opinion BeautyDecoded | Price : ~28 € / 25 ml | Range : Snail Peptide
BeautyDecoded algorithmic scores
| Profile / Issues | Score |
| Dry skin | 84.0 |
| Oily skin | 84.0 |
| Normal to dry skin | 91.0 |
| Normal to oily skin | 91.0 |
| Sensitive skin | 0.8 |
| Anti-aging | 78.2 |
| Imperfections | 25.5 |
| Redness | 76.5 |
| Stains | 17.0 |
Verdict Sensitivity (Dr David rule) : Suitable for sensitive skin (score : 0.75)
Expert deciphering
Eye contour mucin + peptides. Anti-aging score: 78.2 - high for an eye contour. Redness score: 76.5 - relevant for dark circles. Sensitive skin score: +0.75 - excellent. Universal profile (84-91). BeautyDecoded score: 4.42/5 out of 12 reviews - good score for significant volume.
BeautyDecoded feedback confirms good hydration, a fluid texture that's much appreciated, and visible results after a few weeks. Signal limitation: «no decongesting active ingredients» reported in one review (no caffeine) - limited on vascular puffiness. Absorption time reported as slow in one review - mucin characteristic.
Anti-ageing score 78.2: one of the best in the COSRX catalog for an eye contour care product. The combination of mucin (repairing, healing) + peptides (collagen stimulators) is coherent for the fine periorbital area.
My analysis
«Snail Peptide Eye Cream is the best COSRX eye contour cream - anti-aging score 78.2 and sensitive skin +0.75. Good rating (4.42/5) out of 12 reviews. Limitation: no caffeine - no action on vascular puffiness. For pigmented dark circles and fine lines: relevant option. Slow absorption time: plan before the rest of the routine.»
Verdict: - Anti-ageing score 78.2, sensitive skin +0.75. Score 4.42/5 out of 12 reviews. No decongesting active ingredients (puffiness). Mucin + peptides consistent.
BeautyDecoded user reviews (12 reviews in total)
5/5 «I love this eye contour! Moisturizes really well.»
5/5 «I love this eye cream. Fluid texture for a smooth application.»
4/5 «Pleasant, no smell, good capacity. Visible results after a few weeks. Skin takes a little time to absorb.»
4/5 «Moisturizing but no decongesting actives for puffiness.»
Low pH Good Morning Gel Cleanser - TOP for Oily Skin
5/5 4.67/5 - 6 opinion BeautyDecoded | Price : ~12 € / 150 ml | Range : pH-5
BeautyDecoded algorithmic scores
| Profile / Issues | Score |
| Dry skin | 17.5 |
| Oily skin | 91.0 |
| Normal to dry skin | 38.5 |
| Normal to oily skin | 84.0 |
| Sensitive skin | -1.1 |
| Anti-aging | 25.5 |
| Imperfections | 68.0 |
| Redness | 0.0 |
| Stains | 21.3 |
Verdict Sensitivity (Dr David rule) : Slight caution recommended (score: -1.1)
Caution: Salicylic acid + tea tree: absolutely avoid on dry, sensitive and atopic skin. Risk of dehydration and over-exfoliation on these profiles.
Expert deciphering
Gel cleanser pH 5-6 + salicylic acid + tea tree. Oily skin score: 91 - optimal. Dry skin score: 17.5 - formally contraindicated for this profile. Imperfections score: 68 - relevant. BeautyDecoded score: 4.67/5 out of 6 reviews - all positive on oily or combination skin profiles.
BeautyDecoded feedback confirms: effective on small pimples, purified skin without tightness, good value for money. One review mentions a «not so great» scent (tea tree) - but you soon get used to it. The absence of abundant foam reported is characteristic of an SLS-free gel - an advantage for skin tolerance.
Dry skin score 17.5 confirms the critical limit: this cleanser is contraindicated for dry skin. On combination skin: evening use only recommended (without daily BHA to avoid over-exfoliation). On oily, acne-prone skin: daily morning and evening use clinically validated.
My analysis
«Low pH Good Morning Gel Cleanser is K-beauty's benchmark cleanser for oily skin (score 91) - barrier-preserving pH, antibacterial BHA + tea tree, exceptional Q/P ratio (€12/150 ml). Dry skin score 17.5: strictly contraindicated for this profile. Do not use on sensitive or atopic skin.»
Verdict: TOP (oily skin only) - Oily skin score 91. Blemishes 68. 12 €/150 ml: exceptional Q/P ratio. Dry skin score 17.5: contraindicated.
BeautyDecoded user reviews (6 reviews in total)
5/5 «Very gentle, cleans effectively with a sensation of freshness and purified skin.»
5/5 «Excellent value for money. Good cleanser for oily skin. Doesn't lather much - this is normal.»
5/5 «Inexpensive, effective on small pimples. Not a great smell, but you get used to it. Does not dry out.»
4/5 «Effective, skin doesn't tug. Good value for money.»
Advanced Snail 92 All in One Cream - Crème Mucine
4/5 4.13/5 - 24 opinion BeautyDecoded | Price : ~20 € / 100 ml | Range : Snail
BeautyDecoded algorithmic scores
| Profile / Issues | Score |
| Dry skin | 50.4 |
| Oily skin | 84.0 |
| Normal to dry skin | 57.4 |
| Normal to oily skin | 91.0 |
| Sensitive skin | 0.8 |
| Anti-aging | 42.5 |
| Imperfections | 12.8 |
| Redness | 68.0 |
| Stains | 0.0 |
Verdict Sensitivity (Dr David rule) : Suitable for sensitive skin (score : 0.75)
Expert deciphering
All-in-one cream 92 % mucin. Oily skin score: 84 and normal to oily skin score: 91 - optimal profile. Dry skin score: 50.4 - not suitable for very dry skin. Redness score: 68 - relevant for mucin's anti-inflammatory action. BeautyDecoded score: 4.13/5 out of 24 reviews - significant volume.
BeautyDecoded feedback on 24 reviews reveals a split by profile: satisfied (firmness and hydration reported, redemption confirmed) vs. disappointed (insufficient hydration for dry skin). This split is exactly consistent with the dry-skin score of 50.4 vs. the oily-skin score of 84.
Anti-aging score: 42.5 - moderate. This cream is more of a daily moisturizing emollient than an anti-aging corrective. The «All in One» label is marketing - the formula is specialized on hydration and barrier repair, not multi-action anti-aging.
My analysis
«Snail 92 All in One Cream is suitable for normal to oily skin (84-91) looking for a repairing daily care product. Dry skin score 50.4: insufficient for dry skin, confirmed by 24 BeautyDecoded reviews. Redness score 68: an asset for slightly reactive skin. Don't call it «all in one» anti-aging - it's a repairing emollient.»
Verdict: - Oily skin score 84-91. Redness 68. Score 4.13/5 out of 24 reviews. Dry skin score 50.4: insufficient for this profile - confirmed by reviews.
BeautyDecoded user reviews (24 reviews in total)
5/5 «I repurchase - works on firmness and good hydration.»
3/5 «Cream intended for young skin - too light for my dry skin. I will not repurchase.»
Balancium Comfort Ceramide Cream - TOP for dry skin
5/5 4.50/5 - 2 opinion BeautyDecoded | Price : ~25 € / 80 ml | Range : Balancium
BeautyDecoded algorithmic scores
| Profile / Issues | Score |
| Dry skin | 84.0 |
| Oily skin | 91.0 |
| Normal to dry skin | 91.0 |
| Normal to oily skin | 91.0 |
| Sensitive skin | 0.0 |
| Anti-aging | 78.2 |
| Imperfections | 0.0 |
| Redness | 81.6 |
| Stains | 14.4 |
Verdict Sensitivity (Dr David rule) : Suitable for sensitive skin (score : 0)
Expert deciphering
Ceramide cream. Dry skin score: 84 and almost universal profile (84-91 for all skin types). Sensitive skin score: 0 - perfectly suited. Redness score: 81.6 - high. Anti-aging score: 78.2 - relevant for a repair cream. This product was not in the source article - discovered via CSV.
BeautyDecoded score: 4.50/5 on only 2 reviews - insufficient basis. Both reviews are excellent: «best moisturizing cream for dry skin in years» (multi-year loyalty), «glass skin effect», moisture retention over time. These two loyalty signals are statistically insufficient, but qualitatively very significant.
Redness score 81.6: surprising and remarkable for a ceramide cream - signal of significant soothing active ingredients in the formula. Anti-aging score 78.2: consistent with ceramides + probable complementary anti-aging active ingredients. This product deserves follow-up on a higher volume of reviews.
My analysis
«Balancium Comfort Ceramide Cream is the most interesting discovery in the COSRX catalog - redness score 81.6 and anti-aging score 78.2 exceptional for a ceramide cream, sensitive skin 0, multi-year loyalty reported. Base of 2 reviews insufficient but unanimous. Not mentioned in source article. To be explored as a priority.»
Verdict: TOP - Redness score 81.6 and anti-aging score 78.2 (exceptional). Sensitive skin 0. Multi-year loyalty reported. BeautyDecoded discovery. 2 insufficient reviews.
BeautyDecoded user reviews (2 reviews in total)
5/5 «The best moisturizer for my dry skin. I've been using it for years - every time we run out, it's impossible to find an alternative as moisturizing.»
4/5 «Moisturizes and maintains hydration over time. Improves absorption of other products. Excellent glass skin finish.«
The Vitamin C 23 Serum - Sérum Vitamine C
4/5 4.25/5 - 2 opinion BeautyDecoded | Price : ~28 € / 20 ml | Range : The C
BeautyDecoded algorithmic scores
| Profile / Issues | Score |
| Dry skin | 91.0 |
| Oily skin | 84.0 |
| Normal to dry skin | 91.0 |
| Normal to oily skin | 91.0 |
| Sensitive skin | -2.5 |
| Anti-aging | 90.1 |
| Imperfections | 0.0 |
| Redness | 0.0 |
| Stains | 90.1 |
Verdict Sensitivity (Dr David rule) : Warning: Not suitable for sensitive skin (score: -2.5)
Expert deciphering
Vitamin C 23 % (probably pure ascorbic acid). Anti-ageing score: 90.1 and spots: 90.1 - the highest in the COSRX catalog. Universal profile (84-91). Sensitive skin score: -2.50 - slight caution consistent with high concentration of pure AA. This product was not in the source article - discovered via CSV.
BeautyDecoded score: 4.25/5 out of 2 reviews - insufficient basis. The 2 returns confirm: improved shine after a few weeks, non-oxidization reported as a major quality. One user buys some in stock - strong loyalty signal. The stability of vitamin C at 23 % is a major formulation constraint.
23 % of pure AA is a very high concentration - considerably higher than the 15 % of C15 Super Booster Paula's Choice and C-Firma Drunk Elephant. At this concentration, the risk of irritation is higher - gradual introduction mandatory. Excellent Q/P ratio (20 ml at €28) for this concentration.
Source : Pinnell SR et al. Topical vitamin C and E synergistic. Dermatol Surg. 2005.
My analysis
«Vitamin C 23 Serum is the most significant discovery in the COSRX catalog for anti-aging and blemishes - scores of 90.1 (the highest in the catalog). Concentration of 23 % (one of the highest on the market): gradual introduction strictly mandatory. Stability confirmed in reviews. 2 insufficient reviews.»
Verdict: - Anti-ageing and spots 90.1 (best in catalog). 23 % AA pure: very high concentration, gradual introduction mandatory. BeautyDecoded discovery. 2 insufficient reviews.
BeautyDecoded user reviews (2 reviews in total)
5/5 «Works very well and above all doesn't oxidize too quickly - it's a Holy Grail. I keep it in stock and repurchase it often.»
4/5 «Easy to apply, fresh. Skin looks more radiant after a few weeks.»
Ultimate Nourishing Rice Overnight Spa Mask - Warning: Mixed results
4/5 4.27/5 - 11 opinion BeautyDecoded | Price : ~22 € / 60 ml | Range : Rice
BeautyDecoded algorithmic scores
| Profile / Issues | Score |
| Dry skin | 56.0 |
| Oily skin | 56.0 |
| Normal to dry skin | 91.0 |
| Normal to oily skin | 77.0 |
| Sensitive skin | 0.0 |
| Anti-aging | 45.0 |
| Imperfections | 46.8 |
| Redness | 17.0 |
| Stains | 76.5 |
Verdict Sensitivity (Dr David rule) : Suitable for sensitive skin (score : 0)
Expert deciphering
Rice night mask. Normal to dry skin score: 91 - optimal for this type of skin. Dry skin score: 56 - paradoxically moderate for a «nourishing» mask. Sensitive skin score: 0 - perfectly suited. Spots score: 76.5 - relevant (phytosterols and ferulic acid from rice). BeautyDecoded score: 4.27/5 out of 11 reviews.
BeautyDecoded feedback is divided - confirming exactly the formulatory contradiction of the article: «nourishes the skin well» (normal skin) vs. «texture too fine and not nourishing enough for dry skin». Two users have turned the mask into a day or night cream - a signal that the texture is appreciated, but not for the nourishing mask promised.
Score 76.5: the true formulaic value of this mask. Rice extract (ferulic acid, phytosterols) has documented antioxidant and anti-spot properties. The «nourishing» promise is less consistent with the formula than the «light anti-spot» promise.
My analysis
«Rice Overnight Mask has a real anti-dark spot advantage (score 76.5), but its «nourishing» positioning is at odds with the formula (dry skin 56). BeautyDecoded reviews confirm this reading: excellent for normal skin, disappointing for dry skin. To be repositioned as a lightly moisturizing shine-control mask rather than a nourishing mask.»
Verdict: Warning: - Blemish score 76.5 (real asset). Dry skin score 56: contradiction with nourishing promise. Score 4.27/5: divided opinions according to skin type. Sensitive skin 0.
BeautyDecoded user reviews (11 reviews in total)
5/5 «Excellent mask or cream. Nourishes skin well. Gentle formula.»
5/5 «Hydrates the skin superbly. Perfect for dry and dehydrated skin.»
4/5 «Diverted into a morning moisturizer - light, pleasant texture.»
3/5 «Texture too thin and not nourishing enough for my dry skin. Disappointing.»
COSRX routines by profile
Oily/acne-prone skin
Morning: Low pH Good Morning Gel Cleanser - Propolis Synergy Toner - Ultra Light Sunscreen SPF50+
Evening: Low pH Cleanser - BHA Blackhead Power Liquid (2-3×/week) - Snail 96 Mucin Essence - Snail 92 All in One Cream
Retinol-free anti-aging
Morning: Snail 96 Mucin Essence - 6 Peptide Skin Booster - Ultra Light Sunscreen
Evening: Snail 96 Mucin Essence - 6 Peptide Skin Booster - Balancium Ceramide Cream
Sensitive skin / rosacea
Morning: Hydrium Centella Soothing Ampoule - Balancium Ceramide Cream - Ultra Light Sunscreen
Evening: Snail 96 Mucin Essence - Hydrium Centella Ampoule - Balancium Ceramide Cream
Anti-dark spot / radiance
Morning: The Vitamin C 23 Serum (progressive introduction) - Ultra Light Sunscreen (SPF mandatory)
Evening: BHA Blackhead Power Liquid (2-3×/week) - 6 Peptide Skin Booster - Balancium Ceramide Cream
Frequently asked questions about COSRX
Is snail mucin suitable for sensitive, reactive skin?
Yes - that's precisely the profile for which it's best suited. Mucin is non-irritating, fragrance-free in COSRX formulas, and its components (allantoin, glycoproteins) are soothing and repairing active ingredients. Sensitive skin score -1.0 on Essence 96% in contradiction with the 46 reviews (generally positive on sensitive skin) - the algorithmic score probably reflects the presence of preservatives, not the mucin itself.
Can BHA Blackhead Power Liquid be used every day?
Not recommended at the start of a routine. Start with 2 to 3 evenings a week, and evaluate tolerance over 4 weeks. For very oily, resistant skin, daily use in the evening is possible - but watch for signs of over-exfoliation. Never combine with retinol on the same evening.
Is 6 Peptide Serum compatible with pregnancy?
Topical peptides and niacinamide are generally accepted during pregnancy. The formula does not contain retinoids or active ingredients that are formally contraindicated. As always, consult your doctor or midwife before making any routine changes during pregnancy.
How do you position COSRX products in your routine?
Recommended order: cleanser (Low pH if oily skin) - Snail 96 essence or Propolis Toner - active serum (6 Peptide Booster or Vitamin C 23) - BHA (evening, 2-3×/week, before serums) - cream (Balancium Ceramide or Snail 92) - SPF Ultra Light (morning only). Do not use BHA + retinol on the same evening.
What is the BeautyDecoded application?
BeautyDecoded uses artificial intelligence to help you choose the right cosmetics for your skin type. The application analyzes INCI formulations and generates compatibility scores for 80 skin types. It is not a medical consultation, but rather a means of objectively selecting products according to a precise skin profile.
BeautyDecoded - The science of skin. Without marketing.
Information for educational purposes only. This information does not replace a medical consultation. Dr Sylvain David, Plastic Surgeon, Researcher and Youtuber.
