Sunday Riley C.E.O. 15% Vitamin C Brightening Serum — Orange 1.0 fl oz, Stable THD Ascorbate & Soothing Phytosterols

Sunday Riley C.E.O. 15% Vitamin C Brightening Serum is a daily antioxidant serum that uses a stable form of vitamin C to brighten skin tone, reduce the appearance of dark spots, and deliver a radiant-looking finish.

This lightweight serum combines a high concentration (15%) of THD ascorbate, an ultra-stable form of vitamin C, with soothing phytosterols to address uneven tone, dullness, and environmental stressors. Formulated for everyday use, it aims to refresh and clarify the complexion while supporting skin’s visible resilience without heavy, sticky residue. The product arrives in a 1.0 fl oz orange bottle designed to protect the formula’s potency.

How quickly will I notice brighter, more even skin?

Results depend on skin type and consistency, but many users report visible improvements within a few weeks of regular use. Because THD ascorbate is a stable vitamin C derivative, it penetrates effectively and supports gradual brightening without abrupt irritation.

• Use morning or evening after cleansing and before moisturizer.
• Expect incremental improvements over 2–8 weeks with regular application.
• Combine with sunscreen in daytime routines to protect results.

Is this formula suitable for sensitive or reactive skin?

The serum includes phytosterols to help calm and reduce the look of redness, making it more approachable for sensitive skin than some high-dose vitamin C serums. Still, introduce it gradually and patch-test if you have known sensitivities.

• Phytosterols provide soothing benefits and support skin barrier comfort.
• Non-irritating, fast-absorbing texture minimizes surface residue.
• Patch test on the inner forearm before full-face application when concerned.

How should I layer this serum in my skincare routine?

Apply the C.E.O. Brightening Serum after cleansing and toning, and before thicker creams or oils. Because it’s formulated to play well with other actives, you can use it alongside most moisturizers and sunscreens, but take care mixing with highly acidic exfoliants.

• Cleanse, then apply the serum to slightly damp skin for better absorption.
• Follow with hydrators, then sunscreen during daytime use.
• Avoid combining at once with strong chemical exfoliants; space applications if needed.

What key ingredients are included and what do they do?

The serum centers on a stabilized vitamin C derivative for brightening and antioxidant support, paired with a soybean-derived phytosterols complex that helps reduce the visible signs of redness and sensitivity. Together they target dullness, discoloration, and the early appearance of stress-related skin changes.

• THD ascorbate (15%): stable vitamin C for visible brightening and antioxidant protection.
• Phytosterols complex: soybean-derived actives to soothe and calm skin’s appearance.
• Lightweight, fast-absorbing base for comfortable everyday wear.

Who is this for: This serum is built for anyone seeking a potent, everyday vitamin C treatment to improve uneven tone, combat dullness, and support antioxidant defense. It suits most skin types, including those prone to mild sensitivity, and fits into both morning and evening routines when used as directed. Ideal for shoppers who want a high-concentration, stable vitamin C formula from a clean, cruelty-free brand with B Corp certification.

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.