# COSRX The Vitamin C 23 Serum for skin with dark spots

**Lovi Fit: High fit for skin with dark spots.**
Normal Skin Fit: High · Effectiveness: High · Safety: High.

Page: https://lovi.care/skincare/p/cosrx/the-vitamin-c-23-serum/for/dark-spots

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 dark spots: hyperpigmentation, sun spots, and uneven skin tone. For scores based on a full skin profile (12D face scan, goals, preferences), use the Lovi app.

A great choice for skin with dark spots; a few serums fit it even better.

## Why this fit

- Offers excellent brightening and evening of skin tone for your normal skin, as ascorbic acid and 3-O-ethyl ascorbic acid work synergistically to improve pigmentation and provide antioxidant benefits.
- The inclusion of tocopherol further supports barrier repair and offers additional antioxidant protection, enhancing the overall efficacy for your skin concerns.
- The product 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-23-serum/for/oily-skin): Average
- [Dry skin](https://lovi.care/skincare/p/cosrx/the-vitamin-c-23-serum/for/dry-skin): Average
- [Combination skin](https://lovi.care/skincare/p/cosrx/the-vitamin-c-23-serum/for/combination-skin): Average
- [Sensitive skin](https://lovi.care/skincare/p/cosrx/the-vitamin-c-23-serum/for/sensitive-skin): High
- [Acne-prone skin](https://lovi.care/skincare/p/cosrx/the-vitamin-c-23-serum/for/acne-prone-skin): Average
- [Skin with dark spots](https://lovi.care/skincare/p/cosrx/the-vitamin-c-23-serum/for/dark-spots): High (this page)
- [Mature skin](https://lovi.care/skincare/p/cosrx/the-vitamin-c-23-serum/for/mature-skin): Low
- [Dry sensitive skin](https://lovi.care/skincare/p/cosrx/the-vitamin-c-23-serum/for/dry-sensitive-skin): Average
- [Oily acne-prone skin](https://lovi.care/skincare/p/cosrx/the-vitamin-c-23-serum/for/oily-acne-prone-skin): High

## Key ingredients

Ascorbic Acid, Sodium Hyaluronate, Tocopherol Vitamin E, Squalane, 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/))
- Squalane at 0.005-0.015% counteracts UVA-induced oxidative stress, inflammation, and collagen metabolism inhibition while stimulating fibroblast migration in human dermal fibroblasts. ([Molecules, 2025](https://pubmed.ncbi.nlm.nih.gov/40363772/))
- Plant-derived squalane protected human dermal fibroblasts against UVA-induced damage by counteracting ROS formation, suppressing apoptosis-related proteins p53, caspase-3, caspase-9, and PARP, and restoring the pro-survival p-Akt/mTOR pathway. ([Antioxidants, 2025](https://pubmed.ncbi.nlm.nih.gov/40722956/))
- 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

Based on a very large amount of data, users frequently praise this serum for its potent ability to brighten dull complexions and fade stubborn acne scars, often noting visible results within a few weeks. The high 23% concentration can be irritating for sensitive skin, and many users dislike the sticky texture and strong scent.

- Liked: Brightens skin (mostly mentioned)
- Liked: Fades scars (mostly mentioned)
- Disliked: Unpleasant smell (mostly mentioned)
- Liked: Affordable price (often mentioned)
- Disliked: Sticky texture (often mentioned)
- Liked: Fast absorption (sometimes noted)
- Liked: Hydrating formula (sometimes noted)
- Disliked: Oxidation issues (sometimes noted)
- Disliked: Skin irritation (sometimes noted)
- Disliked: Poor packaging (rarely noted)

## How to apply

- Apply this serum as part of your PM routine starting 3x/week and build up to daily use if your skin likes it.
- Place the serum after cleansing and toning, but before your moisturizer.
- Gently press 2-3 drops of the serum into your skin and wait a minute for it to absorb.
- Apply the serum on dry skin to help fade pigmentation effectively.
- Avoid the eye area and always use SPF 30+ during the day.
- Video: https://storage.pora.ai/c879dda8655a61c19d3d8c9ebad6b06d.mp4

## Questions and answers

### What makes COSRX Vitamin C 23 a great fit for skin with dark spots?

COSRX The Vitamin C 23 Serum is a great fit because ascorbic acid and 3-O-ethyl ascorbic acid work together to lighten dark spots and even out your skin tone. It also includes vitamin E to help repair your skin barrier and provide extra antioxidant protection, and it is made without harsh ingredients to keep your skin safe from irritation.
Sources: [Polymers, 2023](https://pubmed.ncbi.nlm.nih.gov/37571190/), [Journal of Cosmetic Dermatology, 2020](https://pubmed.ncbi.nlm.nih.gov/31975502/)

### Which ingredients make this serum a good fit for skin with dark spots?

This serum is a great fit for dark spots because Ascorbic Acid and 3-O-Ethyl Ascorbic Acid work together to brighten skin tone and fade pigmentation. Tocopherol Vitamin E and Niacinamide further help by supporting the skin barrier and providing extra antioxidant protection.
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 skin with dark spots?

Vitamin C helps fade dark spots and brightens uneven skin. It works by slowing down pigment production and boosting overall skin clarity.
Sources: [Journal of Cosmetic Dermatology, 2023](https://pubmed.ncbi.nlm.nih.gov/37128827/), [Dermatologic Surgery, 2005](https://pubmed.ncbi.nlm.nih.gov/16029672/)

### What does Hyaluronic Acid do for skin with dark spots?

Hyaluronic acid is unlikely to directly fade dark spots, but it helps keep dry and uneven skin plump and deeply hydrated. To effectively target dark spots, this type of skin needs brightening ingredients like vitamin C or niacinamide alongside your hydrator.

### Where does this serum go in a skincare routine for skin with dark spots?

This treatment goes in the evening routine after cleansing and before your moisturizer. Putting it at night keeps things simple and helps protect your skin from sun sensitivity while the ingredients work to fade dark spots.
Sources: [Journal of Drugs in Dermatology, 2023](https://pubmed.ncbi.nlm.nih.gov/36607762/)

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

It is best to use this serum and retinol at different times of the day to avoid irritation, applying this vitamin C in the morning and your retinol at night. This serum is unlikely to cause irritation on normal skin and helps brighten dark spots when used properly.
Sources: [Journal of Cosmetic Dermatology, 2020](https://pubmed.ncbi.nlm.nih.gov/31975502/), [Polymers, 2023](https://pubmed.ncbi.nlm.nih.gov/37571190/)

### How often should I use this serum?

Apply this serum in your evening routine, starting gradually to see how your skin adjusts. Antioxidant serums like this help brighten dark spots safely when used consistently.
Sources: [Journal of Cosmetic Dermatology, 2020](https://pubmed.ncbi.nlm.nih.gov/31975502/), [Polymers, 2023](https://pubmed.ncbi.nlm.nih.gov/37571190/)

### Can this serum clog pores, cause breakouts or purging for skin with dark spots?

This serum is unlikely to clog pores or cause breakouts for skin with dark spots because it is free of heavy, pore-clogging ingredients. It also does not cause skin purging since it does not speed up cell turnover.

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

It has no fragrance and contains drying alcohol (alcohol denat).

## Alternatives for skin with dark spots

- [Paula's Choice RESIST Super Antioxidant Concentrate Serum](https://lovi.care/skincare/p/paula-s-choice/resist-super-antioxidant-concentrate-serum/for/dark-spots) — Superior fit — $53.00 at Amazon
- [AMOREPACIFIC Time Response Skin Reserve Serum](https://lovi.care/skincare/p/amorepacific/time-response-skin-reserve-serum/for/dark-spots) — Superior fit — $525.00 at Amazon
- [Beauty of Joseon Propolis + Niacinamide Glow Serum](https://lovi.care/skincare/p/beauty-of-joseon/propolis-niacinamide-glow-serum/for/dark-spots) — High fit — $16.75 at Amazon

## Pairs well with

- Cleanser: [CeraVe Foaming Facial Cleanser](https://lovi.care/skincare/p/cerave/foaming-facial-cleanser/for/dark-spots) — Superior fit — $15.97 at Amazon
- Hydrating Toner: [Pyunkang Yul Calming Deep Moisture Toner](https://lovi.care/skincare/p/pyunkang-yul/calming-deep-moisture-toner/for/dark-spots) — Superior fit — $16.99 at Amazon
- Moisturizer: [Isntree Green Tea Fresh Serum](https://lovi.care/skincare/p/isntree/green-tea-fresh-serum/for/dark-spots) — Superior fit — $17.90 at Amazon

## Where to buy

- Amazon.com: $25.00 (https://www.amazon.com/dp/B0FWQGLTQV?tag=lovi-care-web-product-20&linkCode=osi&th=1&psc=1)
Prices checked 6 Nov 2026.

## Ingredients

Water, Ascorbic Acid, Propanediol, Dimethicone, Tromethamine, Panthenol, 3-O-Ethyl Ascorbic Acid, Squalane, Caffeine, Sodium Chloride, Sodium Hyaluronate, Sodium Sulfite, Disodium Edta, Glutathione, Adenosine, Acetyl Glucosamine, Gardenia Florida Fruit Extract, Allantoin, Dextrin, Tocotrienols, Tocopherol, Palm Oil, Butylene Glycol, Arginine, Niacinamide, Pentylene Glycol, Alcohol Denat, Helianthus Annuus Seed Oil Sunflower Seed Oil, Glycyrrhiza Glabra Root Extract Licorice Root Extract, Methyl Trimethicone, Carthamus Tinctorius Seed Oil, Camellia Japonica Seed Oil, Daucus Carota Sativa Root Extract Carrot Root Extract, Beta-Carotene
## 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-23-serum/for/dark-spots (this page)
- United Kingdom: https://lovi.care/skincare/uk/p/cosrx/the-vitamin-c-23-serum/for/dark-spots
- Ireland: https://lovi.care/skincare/ie/p/cosrx/the-vitamin-c-23-serum/for/dark-spots
- Germany: https://lovi.care/skincare/de/p/cosrx/the-vitamin-c-23-serum/for/dark-spots
- France: https://lovi.care/skincare/fr/p/cosrx/the-vitamin-c-23-serum/for/dark-spots
- Italy: https://lovi.care/skincare/it/p/cosrx/the-vitamin-c-23-serum/for/dark-spots
- Netherlands: https://lovi.care/skincare/nl/p/cosrx/the-vitamin-c-23-serum/for/dark-spots
- Spain: https://lovi.care/skincare/es/p/cosrx/the-vitamin-c-23-serum/for/dark-spots
- Canada: https://lovi.care/skincare/ca/p/cosrx/the-vitamin-c-23-serum/for/dark-spots
- Australia: https://lovi.care/skincare/au/p/cosrx/the-vitamin-c-23-serum/for/dark-spots
- Singapore: https://lovi.care/skincare/sg/p/cosrx/the-vitamin-c-23-serum/for/dark-spots
- Saudi Arabia: https://lovi.care/skincare/sa/p/cosrx/the-vitamin-c-23-serum/for/dark-spots
- United Arab Emirates: https://lovi.care/skincare/ae/p/cosrx/the-vitamin-c-23-serum/for/dark-spots