Sunday Riley C.E.O. 15% Vitamin C Brightening Serum — Fast-Absorbing Oil-Soluble Brightener

Sunday Riley C.E.O. 15% Vitamin C Brightening Serum is a fast-absorbing, oil-soluble vitamin C treatment designed to brighten skin tone while helping restore firmness and smoothness.

Formulated with THD ascorbate, a highly stable, oil-soluble form of vitamin C, this serum penetrates quickly and resists oxidation to deliver an antioxidant-rich boost. It targets the visual signs of dullness, uneven tone, and the early appearance of lines and loss of bounce without leaving a greasy finish, making it suitable for layering under moisturizers and makeup.

How does this serum help improve dull, uneven skin?

The concentrated THD ascorbate works at the surface to promote a brighter, more even-looking complexion. Antioxidant activity supports a radiant finish while the formula minimizes the look of discoloration over consistent use.

• Contains 15% THD ascorbate for potent brightening.
• Oil-soluble delivery encourages rapid absorption into skin.
• Helps reduce the visible appearance of dark spots and dull patches.

Will this serum feel heavy or leave residue under makeup?

This vitamin C serum is designed to be lightweight and non-greasy so it layers smoothly beneath creams and cosmetic products. It absorbs quickly, allowing you to continue your routine shortly after application.

• Thin, fast-penetrating texture for easy layering.
• Non-oily finish that won’t pill under makeup.
• Works well with daytime SPF or nighttime moisturizers.

How often should I use C.E.O. 15% Vitamin C Brightening Serum?

For many users, applying the serum once daily in the morning is effective; it can also be used in evening routines depending on skin tolerance. Start with a few times a week if you have sensitive skin, then build to daily use as tolerated.

• Begin with every-other-day application for sensitive skin.
• Morning use pairs well with sunscreen for antioxidant protection.
• Consistent use over weeks supports visible improvement in tone and texture.

What should I avoid when using this vitamin C serum?

Avoid mixing with highly acidic exfoliants at the same time to reduce potential irritation and to preserve formula stability. If layering actives, alternate or consult your routine to maintain comfort and results.

• Do not combine concurrently with strong chemical peels or concentrated AHAs without guidance.
• Patch test if you regularly react to active ingredients.
• Follow with sunscreen during daytime use to protect newly brightened skin.

Who is this for: This serum suits anyone seeking a stable, high-potency vitamin C treatment that absorbs quickly and targets the look of dullness, dark spots, and early signs of lost firmness. It’s a strong option for users wanting a lightweight antioxidant step that integrates easily into both morning and evening regimens, while those with very reactive skin should introduce it gradually or consult a skincare professional.

Ingredients

INGREDIENTS: Water/Eau/Aqua, Tetrahexyldecyl Ascorbate, Squalane, Polyglyceryl-6 Distearate, PEG-8 Beeswax, PPG-12/SMDI Copolymer, Glycine Soja (Soybean) Sterols, Sodium Phytate, Tocopherol, Acetamidoethoxyethanol, Hydroxyethyl Acrylate/Sodium Acryloyldimethyl Taurate Copolymer, Sodium Acrylate/Sodium Acryloyldimethyl Taurate Copolymer, Jojoba Esters, Glycolic Acid, Caprylyl Glycol, Cetyl Alcohol, Polyglyceryl-3 Beeswax, Chlorphenesin, Glycerin, Polysorbate 60, Sorbitan Isostearate, Saccharide Isomerate, Citrus Aurantium Dulcis (Orange) Peel Oil, Citrus Tangerina (Tangerine) Peel Oil, Linalool, Limonene, Phenoxyethanol.