# COSRX The Vitamin C 13 Serum for oily skin

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

Page: https://lovi.care/skincare/p/cosrx/the-vitamin-c-13-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: [COSRX](https://lovi.care/skincare/brands/cosrx)
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.

A great choice for oily skin; a few serums fit it even better.

## Why this fit

- Offers excellent brightening and evening of skin tone for your oily skin due to the presence of ascorbic acid and 3-0-ethyl ascorbic acid, which provide visible anti-aging effects and support seboregulation.
- The inclusion of niacinamide further enhances antioxidant activity and hydration, beneficial for managing oily shine.
- The formulation is safe for your skin, with no risks of irritation due to the absence of prohibited or harsh ingredients.

## Fit by skin type

- [Oily skin](https://lovi.care/skincare/p/cosrx/the-vitamin-c-13-serum/for/oily-skin): High (this page)
- [Dry skin](https://lovi.care/skincare/p/cosrx/the-vitamin-c-13-serum/for/dry-skin): High
- [Combination skin](https://lovi.care/skincare/p/cosrx/the-vitamin-c-13-serum/for/combination-skin): High
- [Sensitive skin](https://lovi.care/skincare/p/cosrx/the-vitamin-c-13-serum/for/sensitive-skin): High
- [Acne-prone skin](https://lovi.care/skincare/p/cosrx/the-vitamin-c-13-serum/for/acne-prone-skin): High
- [Skin with dark spots](https://lovi.care/skincare/p/cosrx/the-vitamin-c-13-serum/for/dark-spots): Average
- [Mature skin](https://lovi.care/skincare/p/cosrx/the-vitamin-c-13-serum/for/mature-skin): High
- [Dry sensitive skin](https://lovi.care/skincare/p/cosrx/the-vitamin-c-13-serum/for/dry-sensitive-skin): High
- [Oily acne-prone skin](https://lovi.care/skincare/p/cosrx/the-vitamin-c-13-serum/for/oily-acne-prone-skin): High

## Key ingredients

Ascorbic Acid, Sodium Hyaluronate, Super Vitamin E, Glutathione, Niacinamide

## What the research says

- A topical serum containing vitamin C, vitamin E, and raspberry leaf cell culture extract improved skin color, elasticity, radiance, smoothness, scaliness, and wrinkles compared to the untreated contralateral side in fifty female volunteers. ([Journal of Cosmetic Dermatology, 2020](https://pubmed.ncbi.nlm.nih.gov/31975502/))
- A multi-component dissolving microneedle patch loaded with glabridin, 3-O-ethyl-L-ascorbic acid, and tranexamic acid effectively reduced chloasma and age spots while demonstrating safety in clinical evaluation, alongside significant antioxidant, anti-tyrosinase, and melanin-reduction effects in vitro and in vivo. ([Polymers, 2023](https://pubmed.ncbi.nlm.nih.gov/37571190/))
- 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 application of 0.1% hyaluronic acid formulations of different molecular weights led to significant improvements in skin hydration and elasticity, with low-molecular-weight formulations also significantly reducing wrinkle depth in seventy-six female subjects compared to a vehicle control. ([Journal of Drugs in Dermatology, 2011](https://pubmed.ncbi.nlm.nih.gov/22052267/))
- Topical application of hyaluronic acid in conjunction with free gingival graft significantly reduced donor site postoperative pain until day 7 compared to normal saline, with no significant differences in graft dimensions or patient satisfaction. ([Clinical Oral Investigations, 2022](https://pubmed.ncbi.nlm.nih.gov/34623507/))
- Treatment with a hyaluronic acid-containing mouth rinse or topical gel led to significant lesion reduction, pain relief, and normalization of lesion color in adult patients with minor recurrent aphthous stomatitis, with the gel formulation showing an earlier healing onset at 3 days. ([BMC Oral Health, 2019](https://pubmed.ncbi.nlm.nih.gov/31311529/))
- Topical application of an antioxidant serum containing 15% ascorbic acid, 0.5% ferulic acid, and 1% tocopherol prevented particulate matter-induced degradation of extracellular matrix components, inflammation, and oxidative stress in the skin of 15 female volunteers compared to untreated controls. ([Journal of Cosmetic Dermatology, 2025](https://pubmed.ncbi.nlm.nih.gov/40642809/))
- Dermatological products containing d-alpha tocopheryl acetate showed non-comedogenic potential with less than a 50% increase in microcomedones in 12 healthy male subjects compared to octyl palmitate. ([Contemporary Clinical Trials Communications, 2021](https://pubmed.ncbi.nlm.nih.gov/34471722/))
- Topical application of an antioxidant mix containing 15% ascorbic acid, 0.5% ferulic acid, and 1% tocopherol prevented PM and UV-induced skin barrier perturbation, lipid peroxidation, inflammatory markers, MMP9 activation, and Type I collagen loss in 15 healthy females compared to untreated exposed skin. ([Journal of Cosmetic Dermatology, 2024](https://pubmed.ncbi.nlm.nih.gov/38590207/))
- 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 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, 2021](https://pubmed.ncbi.nlm.nih.gov/33103316/))
- Topical 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, 2008](https://pubmed.ncbi.nlm.nih.gov/17882270/))
- Topical 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, 2005](https://pubmed.ncbi.nlm.nih.gov/16029679/))

## What reviewers say

This serum is a gentle and effective option for sensitive and acne-prone skin, frequently praised for its ability to brighten the complexion and fade dark spots without causing irritation. Users often note a hydrating and plumping effect, though a significant number find the strong, fishy scent and sticky finish to be considerable drawbacks. Some also mention the need for refrigeration due to the formula's instability and occasional packaging issues.

- Liked: Gentle formula (mostly mentioned)
- Liked: Brightens skin (often mentioned)
- Disliked: Unpleasant scent (often mentioned)
- Liked: Good value (sometimes noted)
- Liked: Hydrating and plumping (sometimes noted)
- Disliked: Sticky finish (sometimes noted)
- Disliked: Storage requirements (sometimes noted)
- Disliked: Packaging issues (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

### What makes COSRX Vitamin C 13 Serum a great fit for oily skin?

This serum is a great fit because it brightens and evens out skin tone while helping manage oily shine through ingredients like vitamin C and niacinamide. It is also safe and unlikely to cause irritation.
Sources: [Journal of Cosmetic Dermatology, 2020](https://pubmed.ncbi.nlm.nih.gov/31975502/), [Polymers, 2023](https://pubmed.ncbi.nlm.nih.gov/37571190/)

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

This serum is a great fit for your oily skin thanks to ascorbic acid and 3-0-ethyl ascorbic acid, which help brighten your skin tone and manage oil. Niacinamide is also included to provide extra antioxidant protection and hydration while helping control oily shine.
Sources: [Journal of Cosmetic Dermatology, 2020](https://pubmed.ncbi.nlm.nih.gov/31975502/), [Polymers, 2023](https://pubmed.ncbi.nlm.nih.gov/37571190/)

### What does Vitamin C do for oily skin?

Vitamin C helps brighten skin tone and smooth texture while providing antioxidant protection that prevents sebum oxidation. For oily skin, this type of product typically needs to be paired with oil-controlling or pore-clearing ingredients like salicylic acid or plant extracts.
Sources: [International Journal of Cosmetic Science, 2005](https://pubmed.ncbi.nlm.nih.gov/18492184/), [Journal of Cosmetic Dermatology, 2023](https://pubmed.ncbi.nlm.nih.gov/37128827/)

### What does Hyaluronic Acid do for oily skin?

Hyaluronic acid helps oily skin by reducing extra oil and sebum production without causing irritation. Clinical studies show it successfully balances oil levels while keeping the skin comfortable.
Sources: [The Journal of Investigative Dermatology, 2017](https://pubmed.ncbi.nlm.nih.gov/28163068/)

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

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

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

It is best to use this serum and retinol at different times of day, applying this vitamin C serum in the morning and your retinol at night to avoid irritation. Alternatively, you may alternate nights if you use both in your evening routine.

### How often should I use this serum?

You can use this treatment in the evening as part of your routine. Antioxidant serums like this help brighten skin and manage oily shine with a low risk of irritation.
Sources: [Journal of Cosmetic Dermatology, 2020](https://pubmed.ncbi.nlm.nih.gov/31975502/)

### 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 because it has a safe formulation without harsh ingredients. It helps brighten your skin tone and manage oily shine while keeping your skin smooth.
Sources: [Journal of Cosmetic Dermatology, 2020](https://pubmed.ncbi.nlm.nih.gov/31975502/), [Polymers, 2023](https://pubmed.ncbi.nlm.nih.gov/37571190/)

### 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: $14.99 (https://www.amazon.com/dp/B0FWQKKT1K?tag=lovi-care-web-product-20&linkCode=osi&th=1&psc=1)
Prices checked 6 Nov 2026.

## Ingredients

Water, Ascorbic Acid, Butylene Glycol, Dipropylene Glycol, Tromethamine, 3-0-Ethyl Ascorbic Acid, Panthenol, Acetyl Glucosamine, Caffeine, Sodium Hyaluronate, Sodium Sulfite, Disodium Edta, Glutathione, Adenosine, Gardenia Florida Fruit Extract, Allantoin, Dextrin, Squalane, Tocotrienols, Tocopherol, Palm Oil, Arginine, Niacinamide, Pentylene Glycol, Glycyrrhiza Glabra Root Extract Licorice Root Extract
## 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/cosrx/the-vitamin-c-13-serum/for/oily-skin (this page)
- United Kingdom: https://lovi.care/skincare/uk/p/cosrx/the-vitamin-c-13-serum/for/oily-skin
- Ireland: https://lovi.care/skincare/ie/p/cosrx/the-vitamin-c-13-serum/for/oily-skin
- Germany: https://lovi.care/skincare/de/p/cosrx/the-vitamin-c-13-serum/for/oily-skin
- France: https://lovi.care/skincare/fr/p/cosrx/the-vitamin-c-13-serum/for/oily-skin
- Italy: https://lovi.care/skincare/it/p/cosrx/the-vitamin-c-13-serum/for/oily-skin
- Netherlands: https://lovi.care/skincare/nl/p/cosrx/the-vitamin-c-13-serum/for/oily-skin
- Spain: https://lovi.care/skincare/es/p/cosrx/the-vitamin-c-13-serum/for/oily-skin
- Canada: https://lovi.care/skincare/ca/p/cosrx/the-vitamin-c-13-serum/for/oily-skin
- Australia: https://lovi.care/skincare/au/p/cosrx/the-vitamin-c-13-serum/for/oily-skin
- Singapore: https://lovi.care/skincare/sg/p/cosrx/the-vitamin-c-13-serum/for/oily-skin
- Saudi Arabia: https://lovi.care/skincare/sa/p/cosrx/the-vitamin-c-13-serum/for/oily-skin
- United Arab Emirates: https://lovi.care/skincare/ae/p/cosrx/the-vitamin-c-13-serum/for/oily-skin