# Sunday Riley C.E.O. 15% Vitamin C Brightening Serum for combination skin

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

Page: https://lovi.care/skincare/ca/p/sunday-riley/c-e-o-15-vitamin-c-brightening-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 Canada.

Brand: [Sunday Riley](https://lovi.care/skincare/ca/brands/sunday-riley)
Category: [Serums and treatments](https://lovi.care/skincare/ca/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, this serum features tetrahexyldecyl ascorbate and glycolic acid to effectively brighten and even your skin tone, addressing oily shine with mild exfoliation and antioxidant support.
- The inclusion of tocopherol further enhances barrier repair, complementing the brightening effects for your skin type.
- The formulation is safe for your combination skin, containing no harsh or prohibited ingredients that would cause irritation.

## Fit by skin type

- [Oily skin](https://lovi.care/skincare/ca/p/sunday-riley/c-e-o-15-vitamin-c-brightening-serum/for/oily-skin): High
- [Dry skin](https://lovi.care/skincare/ca/p/sunday-riley/c-e-o-15-vitamin-c-brightening-serum/for/dry-skin): Low
- [Combination skin](https://lovi.care/skincare/ca/p/sunday-riley/c-e-o-15-vitamin-c-brightening-serum/for/combination-skin): High (this page)
- [Sensitive skin](https://lovi.care/skincare/ca/p/sunday-riley/c-e-o-15-vitamin-c-brightening-serum/for/sensitive-skin): Average
- [Acne-prone skin](https://lovi.care/skincare/ca/p/sunday-riley/c-e-o-15-vitamin-c-brightening-serum/for/acne-prone-skin): High
- [Skin with dark spots](https://lovi.care/skincare/ca/p/sunday-riley/c-e-o-15-vitamin-c-brightening-serum/for/dark-spots): Superior
- [Mature skin](https://lovi.care/skincare/ca/p/sunday-riley/c-e-o-15-vitamin-c-brightening-serum/for/mature-skin): High
- [Dry sensitive skin](https://lovi.care/skincare/ca/p/sunday-riley/c-e-o-15-vitamin-c-brightening-serum/for/dry-sensitive-skin): Average
- [Oily acne-prone skin](https://lovi.care/skincare/ca/p/sunday-riley/c-e-o-15-vitamin-c-brightening-serum/for/oily-acne-prone-skin): High

## Key ingredients

Tetrahexyldecyl Ascorbate Ascorbic Acid, Squalane, Phytosterols, Glycolic Acid, Saccharide Isomerate

## What the research says

- A 3-in-1 anti-aging topical night serum-in-oil applied once daily decreased wrinkles by 11%, increased skin firmness by 8%, reduced redness by 70%, and improved overall skin quality and complexion in 103 female subjects over 28 to 84 days compared to baseline. ([Journal of Cosmetic Dermatology, 2019](https://pubmed.ncbi.nlm.nih.gov/30924254/))
- 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/))
- 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/))
- 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 application of soybean phytosterols improves skin barrier recovery compared to a vehicle control in human volunteers with tape-stripped skin. ([Journal of Cosmetic Science, 2008](https://pubmed.ncbi.nlm.nih.gov/18528589/))
- Topical application of a formulation containing niacinamide and soy phytosterols recovered about 95% of skin barrier integrity eight days after tape stripping in vivo. ([Current Drug Delivery, 2016](https://pubmed.ncbi.nlm.nih.gov/26201345/))
- Topical application of phytosterols and ceramides on healthy skin blocked the UV-induced down-regulation of COL1A1 and COL1A2 expression, while all four tested preparations inhibited the UV-induced up-regulation of MMP-1. ([Der Hautarzt; Zeitschrift Fur Dermatologie, Venerologie, und Verwandte Gebiete, 2008](https://pubmed.ncbi.nlm.nih.gov/18528670/))
- Repeated short-contact 70% glycolic acid peels provided superior results in atrophic acne scars compared to daily low-strength glycolic acid cream or placebo in 58 women over 24 weeks. ([International Journal of Dermatology, 2000](https://pubmed.ncbi.nlm.nih.gov/11095203/))
- Serial glycolic acid peels combined with a modified Kligman formula significantly reduced facial PIH severity in Indian patients compared to the modified Kligman formula alone. ([Dermatologic Surgery, 2017](https://pubmed.ncbi.nlm.nih.gov/28114204/))
- A combination cream of stimu-tex AS and saccharide isomerate reduced erythema, increased skin capacitance, and reduced transepidermal water loss compared to placebo in 20 subjects after fractional CO2 laser procedure without causing serious adverse events. ([Lasers in Medical Science, 2025](https://pubmed.ncbi.nlm.nih.gov/41134387/))
- A novel moisturizer containing saccharide isomerate accelerates skin barrier recovery, improves hydration, reduces erythema, and alleviates discomfort compared to a control moisturizer following intense pulsed light treatment in subjects with skin aging. ([The Journal of Dermatological Treatment, 2025](https://pubmed.ncbi.nlm.nih.gov/41211697/))
- Formulations containing saccharide isomerate significantly improved transepidermal water loss, sebum secretion, and scalp flaking compared to a placebo formulation in an adult Chinese population affected by dandruff scalp. ([Journal of Cosmetic Dermatology, 2023](https://pubmed.ncbi.nlm.nih.gov/35279940/))

## What reviewers say

Based on a very large amount of data, users with dull, dry, and sensitive skin frequently praise this serum for its rich, creamy texture that hydrates while delivering a visible "lit-from-within" glow. Many report significant fading of acne scars and hyperpigmentation without the irritation common to other Vitamin C products, though a minority of users found the high price point unjustifiable for the results achieved.

- Liked: Brightens and evens tone (mostly mentioned)
- Liked: Hydrating creamy texture (mostly mentioned)
- Disliked: High price point (mostly mentioned)
- Liked: Gentle on sensitive skin (often mentioned)
- Liked: Pleasant citrus scent (often mentioned)
- Disliked: Packaging issues (sometimes noted)
- Disliked: Caused breakouts (rarely noted)
- Disliked: Lack of results (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 Sunday Riley C.E.O. 15% Vitamin C Brightening Serum a great fit for combination skin?

This serum is a great fit because it brightens and evens your skin tone while gently managing oily shine with mild exfoliation and antioxidants. It also helps repair the skin barrier safely without causing irritation.
Sources: [Journal of Cosmetic Dermatology, 2020](https://pubmed.ncbi.nlm.nih.gov/31975502/)

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

This serum is a great fit for your combination skin because it uses tetrahexyldecyl ascorbate and glycolic acid to brighten your skin tone and manage oily shine with gentle exfoliation. It also includes tocopherol to help repair your skin barrier safely without causing irritation.
Sources: [Journal of Cosmetic Dermatology, 2020](https://pubmed.ncbi.nlm.nih.gov/31975502/)

### What does Tetrahexyldecyl Ascorbate do for combination skin?

Tetrahexyldecyl Ascorbate helps brighten combination skin and protect it from daily damage while supporting collagen production. It is unlikely to cause irritation and works well to keep skin smooth and firm.
Sources: [Journal of Cosmetic Dermatology, 2012](https://pubmed.ncbi.nlm.nih.gov/23174055/), [International Journal of Molecular Sciences, 2021](https://pubmed.ncbi.nlm.nih.gov/34445461/)

### What does Squalane do for combination skin?

Squalane helps keep combination skin soft and smooth by locking in moisture without feeling heavy or greasy. It supports the skin barrier and provides lightweight hydration that works well for both dry and oily areas.
Sources: [Skin Health and Disease, 2024](https://pubmed.ncbi.nlm.nih.gov/39355739/), [Journal of Nanobiotechnology, 2025](https://pubmed.ncbi.nlm.nih.gov/40001122/)

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

This treatment serum goes in the evening routine for combination skin. Using it at night helps avoid extra sensitivity around sun exposure while brightening skin tone and keeping oily shine under control.
Sources: [Journal of Drugs in Dermatology, 2023](https://pubmed.ncbi.nlm.nih.gov/36607762/), [Journal of Cosmetic and Laser Therapy, 2012](https://pubmed.ncbi.nlm.nih.gov/22401652/)

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

You can use this serum with retinol, but it is best to apply them on alternate nights or use vitamin C in the morning and retinol at night to avoid overwhelming your skin. Using both active treatments at the exact same time may lead to extra dryness or irritation.

### How often should I use this serum?

This serum is a great fit for your combination skin and is applied in the evening. You can safely start using it once a week, and then carefully use it more often if your skin tolerates it well.

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

This serum is unlikely to cause breakouts for combination skin because it is formulated with safe ingredients that avoid harsh additives and heavy pore-clogging elements. It also helps manage oily shine with mild exfoliation while supporting your skin barrier.

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

It has no drying alcohol and contains fragrance (limonene and linalool).

## Alternatives for combination skin

- [Skin1004 Probio-Cica Intensive Ampoule](https://lovi.care/skincare/ca/p/skin1004/probio-cica-intensive-ampoule/for/combination-skin) — High fit — CA$24.44 at Amazon
- [Dr.Althea Vitamin C Boosting Serum](https://lovi.care/skincare/ca/p/dr-althea/vitamin-c-boosting-serum/for/combination-skin) — High fit — CA$27.99 at Amazon
- [COSRX The Vitamin C 23 Serum](https://lovi.care/skincare/ca/p/cosrx/the-vitamin-c-23-serum/for/combination-skin) — Average fit — CA$33.98 at Amazon

## Pairs well with

- Cleanser: [Fresh Soy Face Cleanser](https://lovi.care/skincare/ca/p/fresh/soy-face-cleanser/for/combination-skin) — Superior fit — CA$44.95 at Amazon
- Hydrating Toner: [Paula's Choice Pore-Reducing Toner](https://lovi.care/skincare/ca/p/paula-s-choice/skin-balancing-pore-reducing-toner/for/combination-skin) — Superior fit — CA$37.60 at Amazon
- Moisturizer: [COSRX Oil-Free Ultra-Moisturizing Lotion with Birch Sap](https://lovi.care/skincare/ca/p/cosrx/oil-free-ultra-moisturizing-lotion-with-birch-sap/for/combination-skin) — Superior fit — CA$29.98 at Amazon

## Where to buy

- Sephora: CA$115.00 (https://www.sephora.com/ca/en/product/c-e-o-rapid-flash-brightening-serum-P418346?skuId=1929306)
Prices checked 10 Oct 2026.

## Ingredients

Water, Tetrahexyldecyl Ascorbate, Squalane, Peg-8 Beeswax, Hydrogenated Polydecene, Polyglyceryl-6 Distearate, Ppg-12 Smdi Copolymer, Phenoxyethanol, Acetamidoethoxyethanol, Jojoba Esters, Sodium Acrylate Sodium Acryloyldimethyl Taurate Copolymer, Glycine Soja Sterols, Tocopherol, Glycolic Acid, Caprylyl Glycol, Sodium Phytate, Citrus Aurantium Dulcis Oil, Chlorphenesin, Alba Cera, Glycerin, Isosqualane, C30 Hydrocarbons, Saccharide Isomerate, Limonene, Linalool
## 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/sunday-riley/c-e-o-15-vitamin-c-brightening-serum/for/combination-skin
- United Kingdom: https://lovi.care/skincare/uk/p/sunday-riley/c-e-o-15-vitamin-c-brightening-serum/for/combination-skin
- Ireland: https://lovi.care/skincare/ie/p/sunday-riley/c-e-o-15-vitamin-c-brightening-serum/for/combination-skin
- Germany: https://lovi.care/skincare/de/p/sunday-riley/c-e-o-15-vitamin-c-brightening-serum/for/combination-skin
- France: https://lovi.care/skincare/fr/p/sunday-riley/c-e-o-15-vitamin-c-brightening-serum/for/combination-skin
- Italy: https://lovi.care/skincare/it/p/sunday-riley/c-e-o-15-vitamin-c-brightening-serum/for/combination-skin
- Netherlands: https://lovi.care/skincare/nl/p/sunday-riley/c-e-o-15-vitamin-c-brightening-serum/for/combination-skin
- Spain: https://lovi.care/skincare/es/p/sunday-riley/c-e-o-15-vitamin-c-brightening-serum/for/combination-skin
- Canada: https://lovi.care/skincare/ca/p/sunday-riley/c-e-o-15-vitamin-c-brightening-serum/for/combination-skin (this page)
- Australia: https://lovi.care/skincare/au/p/sunday-riley/c-e-o-15-vitamin-c-brightening-serum/for/combination-skin
- Singapore: https://lovi.care/skincare/sg/p/sunday-riley/c-e-o-15-vitamin-c-brightening-serum/for/combination-skin
- Saudi Arabia: https://lovi.care/skincare/sa/p/sunday-riley/c-e-o-15-vitamin-c-brightening-serum/for/combination-skin
- United Arab Emirates: https://lovi.care/skincare/ae/p/sunday-riley/c-e-o-15-vitamin-c-brightening-serum/for/combination-skin