Y Theorem Repair Serum
111Skin
Product Verdict Card
111Skin
Y Theorem Repair Serum
serum
Consumer product research based on available product data, ingredients, pricing, and AI analysis. Not skin guidance.
Glow Score
Weak research signal
Formula
Formula read is mixed; compare value before reading the score as a simple yes/no.
Fit flags
Fit is the main watch item; review the ingredient list and compare similar serum options.
Value
Value is a caution flag; the score needs to justify the $465 price.
Compare this against other serum products before buying — especially if price, texture, or ingredient fit matters for you.
Glow Index summary
AI skincare analysis for 111Skin Y Theorem Repair Serum
Glow Index analyzed 111Skin Y Theorem Repair Serum as a serum using a 4-model AI skincare research process. It currently scores 40/100, with the strongest signals coming from ingredient efficacy, safety profile, formula transparency.
Use this page as a product research snapshot: compare the formula/value signals, read the model reasoning, then review the broader serum rankings before deciding whether the product fits your preferences and budget.
Glow Index is a consumer research tool, not medical advice. Scores are based on product information and AI analysis of ingredients, pricing, evidence, and marketing claims. Patch test new products and consult a qualified professional for skin conditions or medical concerns.
Skip It
Our AI panel found this product underdelivers for the price.
Quick Take
Skip it. Better options exist.
Pros
- The NAC Y2 complex contains legitimate actives — sodium ascorbyl phosphate, acetyl cysteine, and niacinamide — with real peer-reviewed evidence, but all three appear after functional excipients like carbomer in the ingredient list, indicating likely sub-therapeutic concentrations.
- Glycerin, sorbitol, and aloe provide reliable surface hydration that most skin types will notice, but these same ingredients anchor $10–15 drugstore serums.
- The 92% efficacy claim is derived from a brand-sponsored consumer perception survey — not an independent peer-reviewed clinical trial — and should not be treated as clinical evidence.
- Trademarked NAC Y2 complex offers vitamin C derivative, N-acetyl cysteine and escin but likely below proven concentrations.
Cons
- Isopropyl myristate is listed as the fourth ingredient — a well-documented pore-clogger that poses real breakout risk for acne-prone or congestion-prone skin.
- Denatured alcohol appears in the top seven ingredients and at meaningful concentrations can impair the skin barrier, counterproductive for a product marketed as a repair treatment.
- Fragrance is listed, raising sensitization risk for sensitive, rosacea-prone, or post-procedure skin — exactly the demographic this brand targets.
- All key actives appear after carbomer and sodium hydroxide, meaning they are almost certainly present at sub-therapeutic concentrations — below the 2–5% niacinamide and 10%+ vitamin C derivative thresholds with documented clinical efficacy.
Budget Alternative
The Ordinary Niacinamide 10% + Zinc 1% by The Ordinary — $7 (pair with SkinCeuticals C E Ferulic at $182 or Paula's Choice C15 Super Booster at $55 for full active overlap at a fraction of the cost)
Score Breakdown
How Each AI Scored
AI Consensus
9.00-pt spread4 AI models independently scored this product, then cross-checked each other’s reasoning. Tap a model to see its take.
FAQ
What does Glow Index measure for 111Skin Y Theorem Repair Serum?
Glow Index evaluates non-medical skincare research signals: ingredient efficacy, safety profile, value for money, formula transparency, skin compatibility, and sensory usability.
Is this a medical recommendation?
No. Glow Index is not medical advice, not a diagnosis, and not a treatment recommendation. It is a consumer research layer for comparing skincare products and marketing claims.
Why does Glow Index use multiple AI models?
Multiple models reduce single-model bias. Glow Index surfaces consensus and disagreement instead of relying on one AI answer or brand marketing copy.