# COSRX The Vitamin C 13 Serum for combination skin

**Lovi Fit: High fit for combination skin.**
Combination Skin Fit: High · Effectiveness: High · Safety: High.

Page: https://lovi.care/skincare/de/p/cosrx/the-vitamin-c-13-serum/for/combination-skin

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

Brand: [COSRX](https://lovi.care/skincare/de/brands/cosrx)
Category: [Serums and treatments](https://lovi.care/skincare/de/best/serums)

This fit is calculated for the concerns frequently associated with combination skin: an oily T-zone, enlarged pores, and dry cheeks. For scores based on a full skin profile (12D face scan, goals, preferences), use the Lovi app.

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

## Why this fit

- Highly suitable for your combination skin, the ascorbic acid and 3-0-ethyl ascorbic acid work to brighten and even your skin tone, while niacinamide helps regulate oil production to address your oily shine.
- Panthenol and sodium hyaluronate provide supportive hydration and soothing benefits, enhancing overall skin comfort.
- The formula is safe for your combination skin, containing no harsh ingredients that would cause irritation.

## Fit by skin type

- [Oily skin](https://lovi.care/skincare/de/p/cosrx/the-vitamin-c-13-serum/for/oily-skin): High
- [Dry skin](https://lovi.care/skincare/de/p/cosrx/the-vitamin-c-13-serum/for/dry-skin): High
- [Combination skin](https://lovi.care/skincare/de/p/cosrx/the-vitamin-c-13-serum/for/combination-skin): High (this page)
- [Sensitive skin](https://lovi.care/skincare/de/p/cosrx/the-vitamin-c-13-serum/for/sensitive-skin): High
- [Acne-prone skin](https://lovi.care/skincare/de/p/cosrx/the-vitamin-c-13-serum/for/acne-prone-skin): High
- [Skin with dark spots](https://lovi.care/skincare/de/p/cosrx/the-vitamin-c-13-serum/for/dark-spots): Average
- [Mature skin](https://lovi.care/skincare/de/p/cosrx/the-vitamin-c-13-serum/for/mature-skin): High
- [Dry sensitive skin](https://lovi.care/skincare/de/p/cosrx/the-vitamin-c-13-serum/for/dry-sensitive-skin): High
- [Oily acne-prone skin](https://lovi.care/skincare/de/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 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, 2002](https://pubmed.ncbi.nlm.nih.gov/12113650/))
- A new topical panthenol-containing emollient significantly improved transepidermal water loss reduction, stratum corneum hydration, and intercellular lipid lamellae length compared with control in healthy subjects without negatively impacting bacterial viability. ([The Journal of Dermatological Treatment, 2017](https://pubmed.ncbi.nlm.nih.gov/27425824/))
- 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 your serum as part of your PM routine. Start using it 3 times a week and move to daily use if your skin likes it.
- Apply the serum after cleansing and toner, and right before your moisturizer.
- Gently press 2-3 drops of the serum into your skin and wait a minute ⏳for it to soak in.
- Apply the serum on clean and dry skin since your skin is not sensitive.
- Always do a patch test before using the serum for the first time, and avoid the eye area .
- Video: https://storage.pora.ai/c879dda8655a61c19d3d8c9ebad6b06d.mp4

## Questions and answers

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

COSRX The Vitamin C 13 Serum is a great fit because ascorbic acid and niacinamide brighten uneven skin tone while helping manage oily shine. Panthenol and sodium hyaluronate add comfortable hydration, and the gentle formula is safe and unlikely to cause irritation.
Sources: [Journal of Cosmetic Dermatology, 2020](https://pubmed.ncbi.nlm.nih.gov/31975502/), [American Journal of Clinical Dermatology, 2002](https://pubmed.ncbi.nlm.nih.gov/12113650/)

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

Ascorbic acid and 3-0-ethyl ascorbic acid brighten and even your skin tone, while niacinamide helps control oily shine on combination skin. Panthenol and sodium hyaluronate also add soothing moisture to keep your face comfortable.
Sources: [Journal of Cosmetic Dermatology, 2020](https://pubmed.ncbi.nlm.nih.gov/31975502/), [American Journal of Clinical Dermatology, 2002](https://pubmed.ncbi.nlm.nih.gov/12113650/)

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

Vitamin C helps brighten dull areas and smooth out uneven texture on combination skin while protecting against daily environmental stress. It may also help keep pores clear and skin firm by supporting collagen production, though drier spots may need an added moisturizer to stay comfortable.
Sources: [Journal of Cosmetic Dermatology, 2020](https://pubmed.ncbi.nlm.nih.gov/31975502/)

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

Hyaluronic acid is a great fit for combination skin because it quenches dry areas with a boost of hydration while keeping oily zones balanced. Regular use helps smooth out fine lines and makes your skin feel soft and plump without causing irritation.
Sources: [Dermatology and Therapy, 2021](https://pubmed.ncbi.nlm.nih.gov/34176098/), [Journal of Drugs in Dermatology, 2011](https://pubmed.ncbi.nlm.nih.gov/22052267/)

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

This serum goes in your evening routine as a treatment step, applied after cleansing and toning and before moisturizing. Putting it in the evening routine helps keep things simple and provides extra safety around sun exposure, though some serums can also be used in the morning or twice a day.

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

You can use this serum with retinol by applying them on alternating nights or separating them into different routines to help avoid irritation. Panthenol helps keep skin calm and hydrated when using active ingredients.
Sources: [Journal of Cosmetic Dermatology, 2024](https://pubmed.ncbi.nlm.nih.gov/38102855/), [American Journal of Clinical Dermatology, 2002](https://pubmed.ncbi.nlm.nih.gov/12113650/)

### How often should I use this serum?

This serum fits your combination skin well and is best used in your evening routine. You can start using it once a week, and if your skin feels comfortable, you may carefully use it more often.
Sources: [Facial Plastic Surgery, 2014](https://pubmed.ncbi.nlm.nih.gov/24488631/)

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

COSRX The Vitamin C 13 Serum is unlikely to clog pores or cause breakouts for combination skin because it avoids heavy or pore-clogging ingredients. The formula also features niacinamide, which helps regulate oil production to keep shiny areas balanced without causing irritation.

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

Yes, it has no fragrance and no drying alcohol.

## Alternatives for combination skin

- [Beauty of Joseon Propolis + Niacinamide Glow Serum](https://lovi.care/skincare/de/p/beauty-of-joseon/propolis-niacinamide-glow-serum/for/combination-skin) — Superior fit — €9.99 at Amazon
- [Neogen Dermalogy Real Niacinamide 15% Firming Serum](https://lovi.care/skincare/de/p/neogen-dermalogy/real-niacinamide-15-firming-serum/for/combination-skin) — Superior fit — €35.29 at Amazon
- [Augustinus Bader The Serum](https://lovi.care/skincare/de/p/augustinus-bader/the-serum/for/combination-skin) — Superior fit — €333.00 at Amazon

## Pairs well with

- Cleanser: [Fresh Soy Face Cleanser](https://lovi.care/skincare/de/p/fresh/soy-face-cleanser/for/combination-skin) — Superior fit — €39.99 at Amazon
- Hydrating Toner: [Paula's Choice Pore-Reducing Toner](https://lovi.care/skincare/de/p/paula-s-choice/skin-balancing-pore-reducing-toner/for/combination-skin) — Superior fit — €36.00 at Amazon
- Moisturizer: [Some By Mi Yuja Niacin Brightening Moisture Gel Cream](https://lovi.care/skincare/de/p/some-by-mi/yuja-niacin-brightening-moisture-gel-cream/for/combination-skin) — Superior fit — €13.67 at Amazon

## Where to buy

- Amazon.de: €16.14 (https://www.amazon.de/dp/B0FWQKKT1K?tag=lovi-care-web-product05-21&linkCode=osi&th=1&psc=1)
- Notino: €21.00 (https://www.notino.de/cosrx/the-vitamin-c-13-aufhellendes-serum-mit-vitamin-c-gegen-pigmentflecken/p-16313435/)
Prices checked 14 Oct – 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/combination-skin
- United Kingdom: https://lovi.care/skincare/uk/p/cosrx/the-vitamin-c-13-serum/for/combination-skin
- Ireland: https://lovi.care/skincare/ie/p/cosrx/the-vitamin-c-13-serum/for/combination-skin
- Germany: https://lovi.care/skincare/de/p/cosrx/the-vitamin-c-13-serum/for/combination-skin (this page)
- France: https://lovi.care/skincare/fr/p/cosrx/the-vitamin-c-13-serum/for/combination-skin
- Italy: https://lovi.care/skincare/it/p/cosrx/the-vitamin-c-13-serum/for/combination-skin
- Netherlands: https://lovi.care/skincare/nl/p/cosrx/the-vitamin-c-13-serum/for/combination-skin
- Spain: https://lovi.care/skincare/es/p/cosrx/the-vitamin-c-13-serum/for/combination-skin
- Canada: https://lovi.care/skincare/ca/p/cosrx/the-vitamin-c-13-serum/for/combination-skin
- Australia: https://lovi.care/skincare/au/p/cosrx/the-vitamin-c-13-serum/for/combination-skin
- Singapore: https://lovi.care/skincare/sg/p/cosrx/the-vitamin-c-13-serum/for/combination-skin
- Saudi Arabia: https://lovi.care/skincare/sa/p/cosrx/the-vitamin-c-13-serum/for/combination-skin
- United Arab Emirates: https://lovi.care/skincare/ae/p/cosrx/the-vitamin-c-13-serum/for/combination-skin