# Allies of Skin 20% Vitamin C Brighten + Firm Serum for sensitive skin

**Lovi Fit: Low fit for sensitive skin.**
Normal Skin Fit: Average · Effectiveness: Average · Safety: High.

Page: https://lovi.care/skincare/de/p/allies-of-skin/20-vitamin-c-brighten-firm-serum/for/sensitive-skin

The Lovi Fit is the same in every country; only the stores and prices differ, and the ones here are for Germany.

Brand: [Allies of Skin](https://lovi.care/skincare/de/brands/allies-of-skin)
Category: [Serums and treatments](https://lovi.care/skincare/de/best/serums)

This fit is calculated for the concerns frequently associated with sensitive skin: redness, stinging, and reactions to new products. For scores based on a full skin profile (12D face scan, goals, preferences), use the Lovi app.

A weak match for sensitive skin; the serums alongside fit it better.

## Why this fit

- Offers moderate suitability for normal skin, as antioxidants like Ergothioneine and Glutathione provide general skincare benefits and support for your redness and irritation.
- While the formula contains Glycerin and Tocopherol for hydration and antioxidant protection, it lacks sufficient humectants to fully address your skin's hydration needs.
- The product is safe for your sensitive skin, containing no harsh ingredients that would cause irritation.

## Fit by skin type

- [Oily skin](https://lovi.care/skincare/de/p/allies-of-skin/20-vitamin-c-brighten-firm-serum/for/oily-skin): Average
- [Dry skin](https://lovi.care/skincare/de/p/allies-of-skin/20-vitamin-c-brighten-firm-serum/for/dry-skin): High
- [Combination skin](https://lovi.care/skincare/de/p/allies-of-skin/20-vitamin-c-brighten-firm-serum/for/combination-skin): High
- [Sensitive skin](https://lovi.care/skincare/de/p/allies-of-skin/20-vitamin-c-brighten-firm-serum/for/sensitive-skin): Low (this page)
- [Acne-prone skin](https://lovi.care/skincare/de/p/allies-of-skin/20-vitamin-c-brighten-firm-serum/for/acne-prone-skin): High
- [Skin with dark spots](https://lovi.care/skincare/de/p/allies-of-skin/20-vitamin-c-brighten-firm-serum/for/dark-spots): Average
- [Mature skin](https://lovi.care/skincare/de/p/allies-of-skin/20-vitamin-c-brighten-firm-serum/for/mature-skin): Average
- [Dry sensitive skin](https://lovi.care/skincare/de/p/allies-of-skin/20-vitamin-c-brighten-firm-serum/for/dry-sensitive-skin): High
- [Oily acne-prone skin](https://lovi.care/skincare/de/p/allies-of-skin/20-vitamin-c-brighten-firm-serum/for/oily-acne-prone-skin): High

## Key ingredients

Ethylated L-Ascorbic Acid, Glutathione, Citrus Aurantium Dulcis Callus Culture Extract, Acetyl Cysteine, Dimethylmethoxy Chromanol

## What the research says

- A targeted skincare regimen containing active ingredients such as rhodophyceae extract, ergothioneine, and L-carnosine significantly reduced transepidermal water loss by 24.09%, improved skin elasticity, and decreased redness, dryness, and desquamation in thirty-five female Chinese participants over 4 weeks following advanced optimal pulse technology treatment. ([International Journal of Cosmetic Science, 2025](https://pubmed.ncbi.nlm.nih.gov/40497421/))
- Glutathione 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, 2024](https://pubmed.ncbi.nlm.nih.gov/38189670/))
- An ergothioneine-sodium hyaluronate dressing scavenges free radicals, reduces oxidative stress, cellular apoptosis, and inflammation in vitro and in vivo to protect against radiation-induced skin injury. ([ACS Applied Materials & Interfaces, 2024](https://pubmed.ncbi.nlm.nih.gov/38813785/))
- Topical application of 5% vitamin C cream significantly improved global clinical scores, increased skin microrelief density, and induced elastic tissue repair in photoaged skin compared to excipient control in healthy female volunteers. ([Experimental Dermatology, 2003](https://pubmed.ncbi.nlm.nih.gov/12823436/))
- Ascorbic acid 2-glucoside gel significantly reduced gingival melanin pigmentation after 4 weeks compared to placebo in 73 subjects with symmetric pigmentation. ([Journal of Periodontology, 2009](https://pubmed.ncbi.nlm.nih.gov/19186973/))
- Topical application of VC-IP cream twice daily for 8 weeks reduces periorbital wrinkles in female subjects compared to a placebo cream. ([Journal of Cosmetic Dermatology, 2022](https://pubmed.ncbi.nlm.nih.gov/34910367/))
- Topical oxidized glutathione significantly decreases the skin melanin index and improves moisture content, smoothness, wrinkle formation, and elasticity compared to placebo in healthy women. ([Clinical, Cosmetic and Investigational Dermatology, 2014](https://pubmed.ncbi.nlm.nih.gov/25378941/))
- Topical glutathione improves hyperpigmentation, reduces ultraviolet-induced erythema and wrinkles, decreases transepidermal water loss, and enhances antioxidant capacity. ([The Journal of Clinical and Aesthetic Dermatology, 2025](https://pubmed.ncbi.nlm.nih.gov/41416233/))
- RayGel 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, 2005](https://pubmed.ncbi.nlm.nih.gov/15862509/))
- Topical 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, 2026](https://pubmed.ncbi.nlm.nih.gov/42190184/))
- Topical 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, 2003](https://pubmed.ncbi.nlm.nih.gov/12537526/))
- Topical 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](https://pubmed.ncbi.nlm.nih.gov/33229673/))
- Supplementation of a broad-spectrum sunscreen with Spirulina and dimethylmethoxy chromanol significantly improved skin pigmentation, reduced collagen degradation, and enhanced net elasticity in 44 healthy subjects after 84 days compared to sunscreen alone. ([European Journal of Pharmaceutical Sciences, 2017](https://pubmed.ncbi.nlm.nih.gov/28341613/))

## What reviewers say

Users report this serum provides a noticeable glow and smoother skin texture, effectively brightening dullness and fading dark spots. Its waterless formula can feel sticky or oily if not applied to damp skin as instructed.

- Liked: Visible brightening and glow (mostly mentioned)
- Liked: Smoother skin texture (often mentioned)
- Disliked: Sticky or thick texture (often mentioned)
- Liked: Non-irritating for many (sometimes noted)
- Liked: Stable, potent formula (sometimes noted)
- Disliked: Application difficulty (sometimes noted)
- Disliked: High price point (sometimes noted)
- Disliked: Unpleasant smell (sometimes noted)
- Disliked: Sensitization or reactions (rarely noted)

## How to apply

- Use your serum in the PM routine, starting 3 times a week before building up to daily use if your skin is happy.
- Apply the serum after cleansing and toning, but before putting on your moisturizer for the best results.
- Gently press 2-3 drops of the serum into your skin and wait a minute ⏱ for it to soak in.
- Since your skin is sensitive and easily irritated, apply the serum on completely dry skin to help keep it calm.
- Always do a patch test before your first use and avoid getting the serum too close to your eyes .
- Video: https://storage.pora.ai/c879dda8655a61c19d3d8c9ebad6b06d.mp4

## Questions and answers

### Why is Allies of Skin 20% Vitamin C Brighten + Firm Serum a weak match for sensitive skin?

This treatment is a weak match because it lacks sufficient hydrating ingredients to fully address your skin's moisture needs. Products for sensitive skin need plenty of gentle humectants and soothing components to keep the skin calm and hydrated.

### Which ingredients make this serum a poor fit for sensitive skin?

This serum is a weak match for sensitive skin because it lacks enough hydrating humectants to fully meet your skin's hydration needs. To fit sensitive skin well, this type of product needs extra hydrating ingredients like glycerin alongside calming agents to soothe redness and irritation.

### What does Ethylated L-Ascorbic Acid do for sensitive skin?

Ethylated L-Ascorbic Acid helps protect sensitive skin from daily environmental stress and UV damage while calming redness and irritation. It also helps brighten dark spots and keeps your skin smooth and glowing without causing harsh irritation.
Sources: [Free Radical Biology & Medicine, 2025](https://pubmed.ncbi.nlm.nih.gov/39778604/), [Journal of Cosmetic Dermatology, 2012](https://pubmed.ncbi.nlm.nih.gov/23174055/)

### What does Glutathione do for sensitive skin?

Glutathione helps calm sensitive skin by reducing oxidative stress and protecting against environmental irritation. It is unlikely to cause irritation and has a very safe profile when used on the skin.
Sources: [Journal of the European Academy of Dermatology and Venereology, 2024](https://pubmed.ncbi.nlm.nih.gov/38189670/), [Indian Journal of Dermatology, Venereology and Leprology, 2016](https://pubmed.ncbi.nlm.nih.gov/27088927/)

### Where does it go in a skincare routine for sensitive skin?

This treatment goes in the evening routine for sensitive skin, applied after your soothing toner and before your moisturizer. Because this serum has a high concentration of vitamin C and lacks sufficient hydrating ingredients, sensitive skin needs a formula with extra soothing ingredients and plenty of moisture to prevent dryness and keep skin calm.

### Can I use this serum with retinol, and in what order?

You can use this serum with retinol by applying your retinol at night and this serum in the morning to keep your sensitive skin calm. This serum is a weak match for your sensitive skin because it lacks sufficient hydrators, so a product of this type needs extra moisture-attracting ingredients to keep dry skin soft and smooth.

### How often should I use it?

This treatment is a weak match for your sensitive skin because it lacks enough hydrating ingredients to meet your skin's needs. Sensitive skin of this type needs products packed with gentle hydrators and soothing antioxidants to stay calm and soft.

### Can it clog pores, cause breakouts or purging for sensitive skin?

This serum is unlikely to clog pores or cause breakouts on sensitive skin because it contains no harsh ingredients that would cause irritation. A product of this type needs soothing ingredients and gentle hydrators like glycerin to keep sensitive skin calm and comfortable.

### Is this serum fragrance-free and alcohol-free?

Yes, it has no fragrance and no drying alcohol.

## Alternatives for sensitive skin

- [Paula's Choice RESIST Super Antioxidant Concentrate Serum](https://lovi.care/skincare/de/p/paula-s-choice/resist-super-antioxidant-concentrate-serum/for/sensitive-skin) — Superior fit — €57.00 at Amazon
- [SkinCeuticals C E Ferulic](https://lovi.care/skincare/de/p/skinceuticals/c-e-ferulic/for/sensitive-skin) — High fit — €169.99 at Amazon
- [Neogen Dermalogy Real Vitamin C Serum](https://lovi.care/skincare/de/p/neogen-dermalogy/real-vitamin-c-serum/for/sensitive-skin) — High fit — €29.76 at Amazon

## Routine for sensitive skin

### AM

- Cleanser: [Fresh Soy Face Cleanser](https://lovi.care/skincare/de/p/fresh/soy-face-cleanser/for/sensitive-skin) — Superior fit — €39.99 at Amazon
- Soothing Toner: [SKIN1004 Centella Asiatica Toning Toner](https://lovi.care/skincare/de/p/skin1004/centella-asiatica-toning-toner/for/sensitive-skin) — Superior fit — €19.89 at Amazon
- Moisturizer with Sun Protection: [Torriden DIVE-IN Mild Sunscreen](https://lovi.care/skincare/de/p/torriden/dive-in-mild-sunscreen/for/sensitive-skin) — Superior fit — €18.00 at Amazon

### PM

- Pre-Cleanser: [MISSHA Ultra Hyalon Cleansing Cream](https://lovi.care/skincare/de/p/missha/ultra-hyalon-cleansing-cream/for/sensitive-skin) — Superior fit — €10.97 at Amazon
- Cleanser: [Fresh Soy Face Cleanser](https://lovi.care/skincare/de/p/fresh/soy-face-cleanser/for/sensitive-skin) — Superior fit — €39.99 at Amazon
- Soothing Toner: [SKIN1004 Centella Asiatica Toning Toner](https://lovi.care/skincare/de/p/skin1004/centella-asiatica-toning-toner/for/sensitive-skin) — Superior fit — €19.89 at Amazon
- Serum or Treatment: [Paula's Choice RESIST Super Antioxidant Concentrate Serum](https://lovi.care/skincare/de/p/paula-s-choice/resist-super-antioxidant-concentrate-serum/for/sensitive-skin) — Superior fit — €57.00 at Amazon
- Moisturizer: [SKIN1004 Centella Asiatica Ampoule](https://lovi.care/skincare/de/p/skin1004/madagascar-centella-asiatica-ampoule/for/sensitive-skin) — Superior fit — €13.88 at Amazon

### Weekly

- Pre-Cleanser: [MISSHA Ultra Hyalon Cleansing Cream](https://lovi.care/skincare/de/p/missha/ultra-hyalon-cleansing-cream/for/sensitive-skin) — Superior fit — €10.97 at Amazon
- Cleanser: [Fresh Soy Face Cleanser](https://lovi.care/skincare/de/p/fresh/soy-face-cleanser/for/sensitive-skin) — Superior fit — €39.99 at Amazon
- Enzyme Powder: [Fancl Facial Washing Powder](https://lovi.care/skincare/de/p/fancl/facial-washing-powder/for/sensitive-skin) — Superior fit — €19.99 at Amazon
- Nourishing Mask: [Anua Heartleaf 77% Soothing Sheet Mask](https://lovi.care/skincare/de/p/anua/heartleaf-77-soothing-sheet-mask/for/sensitive-skin) — Superior fit — €19.20 at Amazon
- Serum or Treatment: [Paula's Choice RESIST Super Antioxidant Concentrate Serum](https://lovi.care/skincare/de/p/paula-s-choice/resist-super-antioxidant-concentrate-serum/for/sensitive-skin) — Superior fit — €57.00 at Amazon
- Moisturizer: [SKIN1004 Centella Asiatica Ampoule](https://lovi.care/skincare/de/p/skin1004/madagascar-centella-asiatica-ampoule/for/sensitive-skin) — Superior fit — €13.88 at Amazon

## Where to buy

- Notino: €106.00 (https://www.notino.de/allies-of-skin/vitamin-c-20-citrus-cells-advanced-firm-glow-serum-aufhellendes-gesichtsserum-mit-vitamin-c/p-16349672/)
Prices checked 5 Nov 2026.

## Ingredients

Propanediol, Glycerin, 3-O-Ethyl Ascorbic Acid, Benzimidazole Diamond Amidoethyl Urea Carbamoyl Propyl Polymethylsilsesquioxane, Dimethyl Isosorbide, Helianthus Annuus Wax Seed, Polyglyceryl-10 Tristearate, Ethoxydiglycol, Dicaprylyl Ether, Water, Caprylyl Glycol, Citrus Aurantium Dulcis Callus Culture Extract, Glutathione, Acetyl Cysteine, Dimethylmethoxy Chromanol, Ergothioneine, Tocopherol, Gluconolactone, Leuconostoc Radish Root Ferment Filtrate, Xanthan Gum, Silica, Sodium Benzoate, Calcium Gluconate, Phenoxyethanol
## About the Lovi Fit

Lovi: Unbiased, science-based skincare AI trained on real user outcomes.

Lovi calculates every fit score from the full ingredient list with brand-independent rules its 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. Levels from best to worst: Superior, High, Average, Low, Caution, Warning.

Behind this fit score: Nadia Kapleva, MS (Co-founder, Medical Director); Alexey Shagraev, PhD (Co-founder, CEO and CTO); Dr. Sofía Perea Pérez, MD, MSc (Medical Board); Aishani Shah, MD (Medical Board); Asya Zubkova, MS (Medical Board); Hanna Kurets, MD (Medical Board, Medical Advisor); Elina Nazarenko, MD (Medical Board); Victoria Derkova, MS (Medical Board).

Page built Nov 8, 2026.

More from Lovi: https://lovi.care/skincare/llms.txt

## This page in other countries

- United States: https://lovi.care/skincare/p/allies-of-skin/20-vitamin-c-brighten-firm-serum/for/sensitive-skin
- United Kingdom: https://lovi.care/skincare/uk/p/allies-of-skin/20-vitamin-c-brighten-firm-serum/for/sensitive-skin
- Ireland: https://lovi.care/skincare/ie/p/allies-of-skin/20-vitamin-c-brighten-firm-serum/for/sensitive-skin
- Germany: https://lovi.care/skincare/de/p/allies-of-skin/20-vitamin-c-brighten-firm-serum/for/sensitive-skin (this page)
- France: https://lovi.care/skincare/fr/p/allies-of-skin/20-vitamin-c-brighten-firm-serum/for/sensitive-skin
- Italy: https://lovi.care/skincare/it/p/allies-of-skin/20-vitamin-c-brighten-firm-serum/for/sensitive-skin
- Netherlands: https://lovi.care/skincare/nl/p/allies-of-skin/20-vitamin-c-brighten-firm-serum/for/sensitive-skin
- Spain: https://lovi.care/skincare/es/p/allies-of-skin/20-vitamin-c-brighten-firm-serum/for/sensitive-skin
- Canada: https://lovi.care/skincare/ca/p/allies-of-skin/20-vitamin-c-brighten-firm-serum/for/sensitive-skin
- Australia: https://lovi.care/skincare/au/p/allies-of-skin/20-vitamin-c-brighten-firm-serum/for/sensitive-skin
- Singapore: https://lovi.care/skincare/sg/p/allies-of-skin/20-vitamin-c-brighten-firm-serum/for/sensitive-skin
- Saudi Arabia: https://lovi.care/skincare/sa/p/allies-of-skin/20-vitamin-c-brighten-firm-serum/for/sensitive-skin
- United Arab Emirates: https://lovi.care/skincare/ae/p/allies-of-skin/20-vitamin-c-brighten-firm-serum/for/sensitive-skin