111SKIN Y Theorem Repair Light Serum NAC Y2 for dry sensitive skin
Nac Y2
Niacinamide
Calendula Officinalis Extract
Aloe Barbadensis Extract
Acetyl CysteineAverage
- AverageDry Skin Fit
- AverageEffectiveness
- HighSafety
Works for dry sensitive skin; other serums fit it better.
This fit is calculated for the concerns frequently associated with dry sensitive skin: flakiness, tightness, redness, fine lines, and wrinkles. For scores and recommendations based on your full skin profile, including your 12D face scan results and any goals or preferences you have, please use the Lovi app.
Page built Nov 8, 2026How the Fit score works
Lovi Assistant explains
- Offers moderate suitability for your dry and sensitive skin as glycerin and aloe barbadensis extract provide hydration and calming effects, while niacinamide and sodium ascorbyl phosphate help with evening skin tone and reducing blemishes.
- Panthenol offers humectant action, but the formula lacks sufficient emollient ingredients like Prunus Armeniaca Kernel Oil to fully address your dryness.
- The product is safe for your skin due to the absence of prohibited or harsh ingredients, posing no risk of irritation.
How to apply
- Use this PM routine for your evening skincare. Start using the serum 3 times a week and increase to daily use if your skin feels comfortable.
- Apply the serum after cleansing and toner, but right before your moisturizer. This step locks in deep hydration for dry skin.
- Gently press 2-3 drops of the serum into your skin using your palms. Let it absorb completely for a minute ⏱ before applying your next product.
- Since your skin is sensitive, apply the serum on completely dry skin for better tolerance and less irritation.
- Avoid the sensitive eye area during application. Always do a patch test before your first use to ensure your skin reacts well.
People Say
★4.2Overall rating based on 200+ reviewsUsers with oily, combination, or humid-climate skin praise the serum's lightweight, water-like texture for providing deep hydration without greasiness, often noting significant improvements in redness, inflammation, and post-procedure healing. A notable portion of reviewers feel the extremely high price point is unjustified, citing strong fragrance and a lack of dramatic anti-aging results as key drawbacks compared to more affordable alternatives.
Highlights
Lightweight & fast-absorbing Mostly Mentioned
- “absorbs almost instantly”
- “water-like texture”
- “not sticky or tacky”
- “perfect for oilier skin”
Extremely expensive Mostly Mentioned
- “not worth the money”
- “terrible for money”
- “understandable to balk at the price”
- “overpriced for what it is”
Hydrating & plumping Often Mentioned
- “skin was baby-soft”
- “beaming with light”
- “hydrates and plumps”
- “woke up looking radiant”
Soothing & healing Often Mentioned
- “calms my very sensitive skin”
- “heals and evens out acne scars”
- “reduced redness”
- “great for post-procedure”
Good for oily skin Sometimes Noted
- “didn't leave me feeling greasy”
- “perfect for oilier skin types”
- “balanced my oily skin”
Lack of visible results Sometimes Noted
- “just ok”
- “none of them did anything”
- “didn't see a difference”
- “all hype”
Strong fragrance Sometimes Noted
- “smells absolutely revolting”
- “wish it wasn't fragranced”
- “strong floral scent”
- “smell is too much”
Potential irritation Rarely Noted
- “winced when applied”
- “not for sensitive skin”
- “caused a reaction”
Sources: lovi.care, sephora.co.uk, spacenk.com, cultbeauty.co.uk, dermstore.com, neimanmarcus.com, and more
Questions and answers
How well does 111SKIN Y Theorem Repair Light Serum work for dry sensitive skin?
This serum offers moderate suitability for your dry sensitive skin as glycerin and aloe provide hydration and calming effects, while niacinamide helps even skin tone. However, the formula lacks sufficient softening ingredients to fully address your dryness. A product of this type needs rich moisturizing and nourishing components to deliver deep hydration and support the skin barrier.
The British Journal of Dermatology, 2002Clinical, Cosmetic and Investigational Dermatology, 2017
Which ingredients make this serum a good fit for dry sensitive skin?
Glycerin and aloe leaf extract make this serum a good fit by providing hydration and calming effects for your dry and sensitive skin. Panthenol also helps retain moisture, while niacinamide and sodium ascorbyl phosphate help even your skin tone and reduce blemishes.
Clinical, Cosmetic and Investigational Dermatology, 2017American Journal of Clinical Dermatology, 2002
What does Nac Y2 do for dry sensitive skin?
NAC Y2 helps soothe and protect dry sensitive skin by calming irritation and fighting oxidative stress. This ingredient is unlikely to cause trouble and works to keep your skin feeling comfortable and smooth.
What does Niacinamide do for dry sensitive skin?
Niacinamide helps dry sensitive skin by calming irritation and keeping moisture locked in so your face feels soft and smooth. It works to build up your skin barrier and calm redness while being very gentle and unlikely to cause irritation.
Journal of Cosmetic Dermatology, 2004International Journal of Pharmaceutics, 2013
Where does this serum go in a skincare routine for dry sensitive skin?
This serum goes in the evening routine after cleansing and toning, and before moisturizing. It works for your dry sensitive skin by providing hydration and calming effects, though a product of this type needs more rich nourishing oils to fully address your dryness.
Can I use this serum with retinol, and in what order?
You can use this treatment in your evening routine after your soothing toner and before your moisturizer, but apply your retinol on alternate nights or consult a professional to avoid irritation. This product is unlikely to irritate your skin due to the absence of harsh ingredients, though a product for dry and sensitive skin also needs rich oils and heavy moisturizers to fully address dryness.
How often should I use this serum?
You can use this treatment in the evening as part of your routine. While it offers moderate hydration and calming effects, dry skin needs additional rich softening ingredients and heavier oils to fully address dryness.
Can this serum clog pores, cause breakouts or purging for dry sensitive skin?
This serum is unlikely to cause breakouts or clog pores on dry sensitive skin, as it contains no harsh or prohibited ingredients that trigger irritation. A product of this type needs richer softening ingredients and oils to properly comfort and nourish dry skin.
Is this serum fragrance-free and alcohol-free?
It contains fragrance (benzyl alcohol and parfum) and drying alcohol (alcohol).
What the research says
Niacinamide significantly decreased hyperpigmentation and increased skin lightness compared with vehicle alone after 4 weeks of use in women by inhibiting melanosome transfer.
The British Journal of Dermatology, 2002A single application of a moisturizing fluid containing hyaluronic acid 1%, glycerin 5%, and Centella asiatica stem cells extract significantly increased skin hydration by 29% and reduced transepidermal water loss at 24 hours compared to baseline and an untreated control site in twenty healthy women.
Clinical, Cosmetic and Investigational Dermatology, 2017Topical combination of 5% sodium ascorbyl phosphate and 0.2% retinol reduced inflammatory acne lesions by 29.28% at 4 weeks and 63.10% at 8 weeks, outperforming either agent alone.
International Journal of Cosmetic Science, 2009Topical dexpanthenol acts as a moisturizer, improves stratum corneum hydration, accelerates wound healing and epidermal regeneration, reduces erythema, and improves symptoms of skin irritation compared to vehicle or no pretreatment.
American Journal of Clinical Dermatology, 2002Glutathione amino acid precursors effectively increase cellular glutathione levels, reducing oxidative stress, ATP depletion, and DNA damage in human keratinocytes, clinical subjects, and ex vivo skin compared to controls.
Journal of the European Academy of Dermatology and Venereology, 2024Topical glutathione improves hyperpigmentation, reduces ultraviolet-induced erythema and wrinkles, decreases transepidermal water loss, and enhances antioxidant capacity.
The Journal of Clinical and Aesthetic Dermatology, 2025RayGel reduced skin reaction severity with a lower average score of 93.7 compared to 123.3 for the placebo group in patients undergoing whole breast external-beam irradiation.
American Journal of Surgery, 2005Topical post-laser application of human adipocyte-derived mesenchymal stem cell media combined with niacinamide significantly improved wrinkle index, melanin index, patient satisfaction, and investigator esthetic improvement scores compared to vehicle cream in patients with aging skin.
Journal of Cosmetic Dermatology, 2021Topical nicotinamide prevented solar-simulated UV-induced immunosuppression in healthy volunteers, and men experienced immunosuppression at solar-simulated UV doses three times lower than those required for women.
The Journal of Investigative Dermatology, 2008Topical 5% niacinamide applied twice daily for 12 weeks reduced fine lines and wrinkles, hyperpigmented spots, red blotchiness, and skin sallowness, and improved skin elasticity compared to vehicle control in 50 female white subjects with facial photoaging.
Dermatologic Surgery, 2005Topical application of Calendula officinalis extract cream significantly improved skin hydration and firmness (reflected in significant changes in R0 and R6 parameters) in 21 healthy human volunteers compared to a base cream.
Acta Poloniae Pharmaceutica, 2011Treatment with standardized extract of Calendula officinalis L. led to a shorter epithelization time and faster healing speed compared to mineral oil in patients with acute skin loss wounds of the hand and fingers healing by secondary intention.
Tissue Barriers, 2022Topical administration of Calendula provides weak evidence of effectiveness in acute and chronic wounds compared to standard treatments based on a narrative review of available trials.
Wounds, 2008A cream combining propolis, tea tree oil, and Aloe vera reduced erythema scars, acne severity index, and total lesion count better than erythromycin cream in sixty patients with mild to moderate acne vulgaris compared to placebo.
Clinical Pharmacology, 2018Topical aloe vera gel significantly accelerated split-thickness skin graft donor-site healing compared to placebo in 12 patients, but showed no significant difference in pain relief.
Plastic and Reconstructive Surgery, 2018Topical application of Aloe vera cream reduced postoperative pain at rest and during defecation, accelerated wound healing at two weeks, and decreased analgesic requirements in patients after open hemorrhoidectomy compared to placebo.
Journal of Alternative and Complementary Medicine, 2010Topical N-acetylcysteine plus doxycycline achieved significantly greater improvements in total lesion count, inflammatory lesion count, IGA, GAGS, and CADI scores compared to benzoyl peroxide plus doxycycline in 40 patients with moderate acne vulgaris.
Dermatology Practical & Conceptual, 2026Topical application of alpha-tocopherol, l-ascorbic acid, alpha-lipoic acid, glutathione ethylester, and N-acetylcysteine decreased UVB-radiation-induced cell death, apoptosis, and lipid peroxidation in ex vivo pig skin explants compared to untreated controls.
Radiation Research, 2003Topical vitamin C, vitamin E, and acetylcysteine showed similar effects on the healing of experimentally created corneal wounds in rabbits, with no statistically significant differences compared to each other.
Indian Journal of Ophthalmology, 2020
Why other serums fit dry sensitive skin better
Tocopherol succinate-loaded ethosomal gel increased skin deposition, stability, moisture, and mechanical properties in 13 human subjects compared to a control gel over 12 weeks.
Journal of Cosmetic Dermatology, 2022In 50 participants with sensitive skin, a Ceramide NP C15-containing emollient improved skin barrier function with a significant reduction in transepidermal water loss and induced modest changes in skin microbiota compared to the vehicle.
Skin Pharmacology and Physiology, 2026Hydrogels containing vitamin E-loaded nanostructured lipid carriers exhibited better occlusive properties and long-lasting effects, while vitamin E-loaded nanoemulsions performed a faster skin hydration effect and were selected as more attractive for skin application.
Colloids and Surfaces. B, Biointerfaces, 2019
Ingredients
Water, Glycerin, Alcohol, Benzyl Alcohol, Aloe Barbadensis Extract, Calendula Officinalis Extract, Carbomer, Sodium Hydroxide, Aesculus Hippocastanum Extract, Sodium Ascorbyl Phosphate, Panthenol, Niacinamide, Thiamin, Riboflavin, Pyridoxine, Cyanocobalamin, Glycyrrhiza Glabra Root Extract Licorice Root Extract, Prunus Armeniaca Kernel Oil Apricot Kernel Oil, Acetyl Cysteine, Parfum
Behind this fit score
Lovi calculates every fit score from the full ingredient list with brand-independent rules our dermatologists and cosmetic chemists build and review, and personalizes every pick with AI trained on the real results of millions of users. Lovi trains its fit score models on a proprietary dataset built from more than 10,000 expert-labeled products and more than 100,000 simulated examples, following an internally consistent methodology presented at Cosmoprof, AMWC, and Skin of Color Update.
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Co-founder, Medical Director
Cosmetic chemist, cosmetologist, aesthetic products developer
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Co-founder, CEO and CTO
PhD in computer science, 3x US patent holder, ex-Google, ex-Yandex
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Dr. Sofía Perea Pérez, MD, MSc
Medical Board
Aesthetic medicine practitioner, MSc in Longevity and Anti-Aging Medicine
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Medical Board
Specialist dermatologist, MBBS, MD, IFAAD
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Medical Board
Cosmetic chemist, SCS, IFSCC member
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Medical Board, Medical Advisor
Dermatology MD
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Elina Nazarenko, MD
Medical Board
Dermatology and diagnostic consultant
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Victoria Derkova, MS
Medical Board
Cosmetic chemist, cosmetic development technologist
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