111SKIN Y Theorem Repair Light Serum NAC Y²™

Y Theorem Repair Light Serum NAC Y²™ is a lightweight repair serum originally developed to support post-surgical skin recovery, now reformulated as an everyday treatment for combination, oily, and sensitive skin. Built around 111SKIN's signature NAC Y2™ complex, it visibly repairs stressed skin, softens the look of wrinkles, and calms redness and sensitivity — all in a fast-absorbing, non-greasy texture ideal for humid climates.

Who it's for: Combination, oily, and sensitive skin types, including those in humid climates or with skin stressed by sun exposure or environmental factors.

Key Benefits

• Repairs the appearance of stressed, compromised skin
• Visibly reduces the look of fine lines and wrinkles
• Defends against environmental stressors
• Soothes sensitivity and redness
• Lightweight formula suited to breakout-prone and oilier skin

Why We Love It at Le Petit Spa
We recommend the Y Theorem Repair Light Serum for clients with combination or oily skin who still want the visible repair benefits of 111SKIN's signature NAC Y2™ complex without a heavy feel. It's a luxurious step that layers beautifully into any routine, calming redness while supporting skin's natural resilience. Clients love the fast-absorbing texture — it feels like a true skin treatment, not just a lightweight serum.

How to Use

1. Apply 1–2 pumps to cleansed face and neck.
2. Smooth in upward motions morning and evening, before moisturizer.
3. For enhanced delivery, apply after an essence.

Key Ingredients

NAC Y2™ Complex: 111SKIN's signature blend of Vitamin C, Escin, and NAC, designed to promote glutathione production and support visible skin repair while defending against daily stressors.
Niacinamide: Helps restore skin's lipid balance for moisture while calming and brightening.
Licorice Root Extract: A brightening agent that helps visibly reduce the look of hyperpigmentation.

Ingredient Note: Ingredients may change from time to time. Please refer to the product packaging for the most current and complete ingredient list before use.

FAQ

What is NAC Y2™?
It's 111SKIN's proprietary complex combining Vitamin C, Escin, and NAC, formulated to support the skin's natural repair processes and antioxidant defenses.

Is this serum suitable for oily or acne-prone skin?
Yes — the "Light" formula was developed specifically for combination, oily, and breakout-prone skin, as well as humid climates.

Will it help with redness and sensitivity?
Yes, the formula is designed to soothe sensitivity and visibly calm redness.

When should I apply it in my routine?
After cleansing (and essence, if used), before moisturizer — morning and evening.

How is this different from the original Repair Serum NAC Y2™?
The Light Serum has a thinner, faster-absorbing texture tailored to oilier and combination skin types, while still delivering the same signature NAC Y2™ complex.