Sunday Riley C.E.O. 15% Vitamin C Brightening Serum — THD Ascorbate, lightweight daily antioxidant for dark spots

Sunday Riley C.E.O. 15% Vitamin C Brightening Serum is a fast-absorbing, oil-soluble vitamin C formula (THD Ascorbate) designed to brighten skin tone, reduce the look of dark spots, and restore a firmer, more youthful bounce.

This serum uses a highly stable form of vitamin C that penetrates quickly and plays well in oil-compatible skincare routines. Formulated to target visible uneven tone and dullness, it aims to refresh skin radiance while supporting the appearance of smoother texture and reduced visible lines. Lightweight and designed for daily use, it layers under moisturizers and makeup without leaving a heavy residue.

How quickly will I notice brighter, more even-looking skin?

Visible improvements depend on your skin and routine, but many users report a brighter complexion within weeks of consistent application. Results improve when used as directed, alongside sun protection and complementary actives.

• Apply morning or evening to clean, dry skin for best absorption.
• Consistent use—daily—supports gradual reduction of dullness and dark spots.
• Pair with SPF during the day to protect treated skin and maintain results.

What makes THD ascorbate in this formula different from other vitamin C types?

THD ascorbate is an oil-soluble, ultra-stable vitamin C derivative that absorbs rapidly into the skin and is less prone to oxidation than ascorbic acid. Its oil solubility helps it integrate into oil-compatible products and delivers antioxidant benefits without the typical acidic feel.

• 15% concentration provides a potent supply of stable vitamin C.
• Oil-soluble form improves penetration into the skin’s lipid layers.
• Formulation reduces oxidation risk, preserving efficacy during use.

How should I incorporate this serum into my skincare routine?

Use C.E.O. after cleansing and before moisturizing. Because it’s oil-soluble and fast-absorbing, it works well under creams and sunscreens and can be layered with other serums depending on your skin’s tolerance.

• Cleanse, then apply a few drops of serum to face and neck.
• Follow with moisturizer and broad-spectrum SPF in the morning.
• Avoid mixing with high-strength exfoliating acids simultaneously to reduce irritation risk.

Is this serum suitable for sensitive or acne-prone skin?

The oil-soluble THD ascorbate is generally gentler than some acidic vitamin C forms, but individual sensitivity varies. Perform a patch test and introduce slowly if you have reactive skin.

• Patch test behind the ear or inner forearm before full-face use.
• Start with every-other-day application, increasing as tolerated.
• If irritation occurs, pause use and consult a dermatologist for guidance.

Who this product is for: The Sunday Riley C.E.O. 15% Vitamin C Brightening Serum is aimed at people seeking a stable, fast-absorbing vitamin C treatment to address visible dullness, uneven tone, and the early appearance of lines and texture concerns. It suits those who want a powerful antioxidant boost that layers cleanly under moisturizers and makeup, and who prioritize a formula designed for long-term stability and daily use.

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.