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

**Lovi Fit: Average fit for oily skin.**
Oily Skin Fit: Average · Effectiveness: Average · Safety: Low Risk.

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

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

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

This fit is calculated for the concerns frequently associated with oily skin: shine, enlarged pores, blackheads, and blemishes. For scores based on a full skin profile (12D face scan, goals, preferences), use the Lovi app.

Works for oily skin; other serums fit it better.

## Why this fit

- Offers moderate suitability for oily skin as Glycerin and Propanediol provide hydration, but it lacks sufficient seboregulating ingredients to fully address your oily shine concerns.
- The presence of 3-O-Ethyl Ascorbic Acid and Ergothioneine offers excellent brightening and firming benefits, evening your skin tone and improving elasticity.
- The product is generally safe for your oily skin, with a low risk of irritation from 3-O-Ethyl Ascorbic Acid.

## Fit by skin type

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

- Topical application of 1,3-propanediol at various concentrations, alone or combined with butylene glycol and/or glycerol, increased skin hydration and reduced trans epidermal water loss in 30 healthy female subjects over an 8-hour period, with the 15% concentration and the addition of glycerol providing greater benefits. ([International Journal of Cosmetic Science, 2024](https://pubmed.ncbi.nlm.nih.gov/37699769/))
- A 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, 2017](https://pubmed.ncbi.nlm.nih.gov/28860834/))
- 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/))
- A triple combination of ergothioneine, collagen peptides, and sodium hyaluronate attenuated UV-induced skin damage ex vivo and improved facial skin hydration, elasticity, barrier function, and wrinkles in Chinese women. ([Frontiers in Nutrition, 2026](https://pubmed.ncbi.nlm.nih.gov/42698538/))
- Dissolving microneedles loaded with 3-O-ethyl ascorbic acid and acetyl hexapeptide-8 achieved higher cumulative transdermal delivery than aqueous solutions and significantly reduced photoaging signs while restoring oxidative balance in a UV/D-galactose-induced mouse model. ([International Journal of Biological Macromolecules, 2026](https://pubmed.ncbi.nlm.nih.gov/41628877/))
- 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/))
- 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/))
- 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/))
- 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/))

## Why other serums fit oily skin better

- A panthenol-enriched mask improved skin hydration, regulated sebum, and reduced redness and TEWL across dry sensitive, oily sensitive, and oily acne skin subgroups with excellent tolerance and no adverse reactions. ([Journal of Cosmetic Dermatology, 2024](https://pubmed.ncbi.nlm.nih.gov/38366684/))
- Niacinamide and ferulic acid incorporated in a stable multiple emulsion successfully reduced melanin, sebum, and skin erythema while improving skin elasticity and hydration in human skin compared to a placebo. ([BioMed Research International, 2022](https://pubmed.ncbi.nlm.nih.gov/35342760/))

## 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 this serum in your PM routine. Start by applying it 3 times a week and build up to daily use if your skin tolerates it well.
- Apply the serum after cleansing and toning, but right before your moisturizer for the best results.
- Gently press 2-3 drops of the serum into your skin. Let it absorb ⏱ for a minute before applying the next product.
- Apply the serum on clean and dry skin since your skin is not sensitive and you want to target oily shine. This helps control excess oil throughout the night.
- Avoid the delicate eye area and do a patch test before using the serum for the very first time.
- Video: https://storage.pora.ai/c879dda8655a61c19d3d8c9ebad6b06d.mp4

## Questions and answers

### How well does Allies of Skin 20% Vitamin C Brighten + Firm Serum work for oily skin?

This serum works moderately well for oily skin because glycerin and propanediol provide hydration, but it lacks enough ingredients to control oily shine. While it safely brightens and firms your skin with a low risk of irritation, a product for this skin type needs ingredients like niacinamide, zinc PCA, or ferulic acid to manage excess oil and pores while keeping skin balanced.
Sources: [International Journal of Cosmetic Science, 2024](https://pubmed.ncbi.nlm.nih.gov/37699769/), [Clinical, Cosmetic and Investigational Dermatology, 2017](https://pubmed.ncbi.nlm.nih.gov/28860834/)

### Which ingredients make this serum a good fit for oily skin?

This serum offers moderate suitability for oily skin because Glycerin and Propanediol provide hydration, and 3-O-Ethyl Ascorbic Acid and Ergothioneine help brighten and firm. However, it lacks sufficient oil-controlling ingredients like niacinamide and zinc PCA to fully address shiny skin.
Sources: [International Journal of Cosmetic Science, 2024](https://pubmed.ncbi.nlm.nih.gov/37699769/), [Clinical, Cosmetic and Investigational Dermatology, 2017](https://pubmed.ncbi.nlm.nih.gov/28860834/)

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

Ethylated L-Ascorbic Acid helps protect oily skin from sun damage and calm irritation when used in your routine. It provides reliable antioxidant support and helps keep your skin looking clear and balanced.
Sources: [Journal of Cosmetic Dermatology, 2012](https://pubmed.ncbi.nlm.nih.gov/23174055/), [International Journal of Pharmaceutics: X, 2019](https://pubmed.ncbi.nlm.nih.gov/31517290/)

### What does Glutathione do for oily skin?

Glutathione helps protect oily skin from everyday damage and oxidative stress. It may also help keep your skin looking bright and smooth.
Sources: [Journal of the European Academy of Dermatology and Venereology, 2024](https://pubmed.ncbi.nlm.nih.gov/38189670/)

### Where does this serum go in a skincare routine for oily skin?

This treatment serum goes in the evening routine after cleansing and toning, and before moisturizing. Putting treatments in the evening helps keep things simple and offers extra safety around sun exposure.

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

This serum works for oily skin, though other products fit it better. To use it with retinol, apply your retinol in your evening routine and keep this treatment separate to avoid irritation, or use them on alternate nights.

### How often should I use this serum?

This serum works well in your evening routine, and some people can also use it in the morning or twice a day. To better fit oily skin, a product of this type needs ingredients that help balance oil and reduce shine while keeping skin hydrated.

### Can this serum clog pores, cause breakouts or purging for oily skin?

This serum is unlikely to clog pores or cause breakouts for oily skin, as it has a generally safe profile and a low risk of irritation. However, because it lacks sufficient shine-controlling ingredients, an oily skin type needs a formula with targeted seboregulating components to fully manage excess oil.

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

Yes, it has no fragrance and no drying alcohol.

## Alternatives for oily skin

- [Beauty of Joseon Propolis + Niacinamide Glow Serum](https://lovi.care/skincare/p/beauty-of-joseon/propolis-niacinamide-glow-serum/for/oily-skin) — Superior fit — $16.75 at Amazon
- [Neogen Dermalogy Real Niacinamide 15% Firming Serum](https://lovi.care/skincare/p/neogen-dermalogy/real-niacinamide-15-firming-serum/for/oily-skin) — Superior fit — $28.88 at Amazon
- [SkinCeuticals C E Ferulic](https://lovi.care/skincare/p/skinceuticals/c-e-ferulic/for/oily-skin) — High fit — $39.99 at Amazon

## Pairs well with

- Cleanser: [CeraVe Foaming Facial Cleanser](https://lovi.care/skincare/p/cerave/foaming-facial-cleanser/for/oily-skin) — Superior fit — $15.97 at Amazon
- Hydrating Toner: [SOME BY MI Snail Truecica Miracle Repair Toner](https://lovi.care/skincare/p/some-by-mi/snail-truecica-miracle-repair-toner/for/oily-skin) — Superior fit — $15.60 at Amazon
- Moisturizer: [COSRX Oil-Free Ultra-Moisturizing Lotion with Birch Sap](https://lovi.care/skincare/p/cosrx/oil-free-ultra-moisturizing-lotion-with-birch-sap/for/oily-skin) — Superior fit — $18.99 at Amazon

## Where to buy

- Amazon.com: $99.88 (https://www.amazon.com/dp/B08L6B88MQ?tag=lovi-care-web-product-20&linkCode=osi&th=1&psc=1)
Prices checked 6 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/oily-skin (this page)
- United Kingdom: https://lovi.care/skincare/uk/p/allies-of-skin/20-vitamin-c-brighten-firm-serum/for/oily-skin
- Ireland: https://lovi.care/skincare/ie/p/allies-of-skin/20-vitamin-c-brighten-firm-serum/for/oily-skin
- Germany: https://lovi.care/skincare/de/p/allies-of-skin/20-vitamin-c-brighten-firm-serum/for/oily-skin
- France: https://lovi.care/skincare/fr/p/allies-of-skin/20-vitamin-c-brighten-firm-serum/for/oily-skin
- Italy: https://lovi.care/skincare/it/p/allies-of-skin/20-vitamin-c-brighten-firm-serum/for/oily-skin
- Netherlands: https://lovi.care/skincare/nl/p/allies-of-skin/20-vitamin-c-brighten-firm-serum/for/oily-skin
- Spain: https://lovi.care/skincare/es/p/allies-of-skin/20-vitamin-c-brighten-firm-serum/for/oily-skin
- Canada: https://lovi.care/skincare/ca/p/allies-of-skin/20-vitamin-c-brighten-firm-serum/for/oily-skin
- Australia: https://lovi.care/skincare/au/p/allies-of-skin/20-vitamin-c-brighten-firm-serum/for/oily-skin
- Singapore: https://lovi.care/skincare/sg/p/allies-of-skin/20-vitamin-c-brighten-firm-serum/for/oily-skin
- Saudi Arabia: https://lovi.care/skincare/sa/p/allies-of-skin/20-vitamin-c-brighten-firm-serum/for/oily-skin
- United Arab Emirates: https://lovi.care/skincare/ae/p/allies-of-skin/20-vitamin-c-brighten-firm-serum/for/oily-skin