Sunday Riley C.E.O. 15% Vitamin C Brightening Serum Orange 1 oz — Lightweight, Stable THD Ascorbate

Sunday Riley C.E.O. 15% Vitamin C Brightening Serum is a fast-absorbing vitamin C treatment that visibly brightens, evens tone, and boosts antioxidant protection for a healthier-looking glow.

This lightweight serum delivers 15% THD ascorbate, a stable, oil-soluble form of vitamin C, combined with a soothing phytosterol complex to reduce the appearance of dullness, discoloration, and redness without harsh irritation. The formula is designed for daily use under moisturizers and makeup, providing an antioxidant-rich layer that helps skin look more radiant over time.

How quickly will I notice brighter skin?

Many users observe improved radiance within a few weeks, with more pronounced evening of tone after consistent use for 4–8 weeks. Results depend on skin type, prior discoloration, and how regularly you apply the serum as part of your regimen.

• Apply once or twice daily to clean, dry skin for best outcomes.
• Visible glow may appear within 2–4 weeks of regular use.
• More significant fading of dark spots often needs continued use for 4–8 weeks.

Can this serum be used with other active ingredients?

The formula pairs well with many routines but should be layered mindfully with other potent actives. Vitamin C works nicely with hyaluronic acid and sunscreens; avoid mixing directly with highly acidic exfoliants at the same moment to reduce irritation risk.

• Compatible with hydrating serums like hyaluronic acid.
• Apply retinol or AHAs at a different time of day if you have sensitive skin.
• Always finish with SPF in the morning when using vitamin C products.

What ingredients make this formula effective and gentle?

This serum uses 15% THD ascorbate, an ultra-stable, oil-soluble vitamin C derivative known for brightening and antioxidant benefits. A phytosterol complex derived from soy helps calm redness and reduce sensitivity, balancing vitamin C’s potency for everyday use.

• 15% THD ascorbate: stable vitamin C for brightening and antioxidant defense.
• Phytosterols complex: soothes and helps minimize visible redness.
• Lightweight carrier base for quick absorption and comfortable wear under makeup.

How should I incorporate it into my daily routine?

Use the serum after cleansing and before moisturizing; a little goes a long way. In the mornings, pair it with a broad-spectrum SPF; in evenings, it can follow cleansing and hydration steps to support nightly skin renewal.

• Morning: cleanse, apply C.E.O., moisturize, then sunscreen.
• Evening: cleanse, apply a few drops of serum, follow with moisturizer.
• Start slowly (every other day) if you have sensitive skin, then increase frequency.

Who is this for: Ideal for people seeking a non-irritating vitamin C serum to improve dullness, uneven tone, and early signs of environmental stress. It suits all skin types, including those prone to mild redness, thanks to the calming phytosterols. If you want a daily antioxidant boost that layers well with sunscreen and hydrating products, this serum fits into both simple and multi-step skincare routines.

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.