ZO Skin Health 10% Vitamin C Self-Activating Serum

It delivers a high-strength, self-activating dose of vitamin C to brighten a dull-looking complexion, help even the appearance of skin tone and soften the look of fine lines and wrinkles. Antioxidants help defend the skin against everyday environmental stressors.

Yes. It combines 10% ascorbic acid with oil-soluble tetrahexyldecyl ascorbate, two forms of vitamin C that work together to brighten the look of skin and reduce the appearance of surface discolouration and dark spots for a more even-looking, radiant complexion.

Apply once a day, morning or evening, to clean, dry skin as the last step before sunscreen or make-up. Many people prefer the morning so the antioxidants can support daytime defence, but it works either way — choose whichever fits your routine.

A slight tingling or warmth on application is a normal reaction to a high-strength, anhydrous vitamin C and usually settles as your skin adjusts. If your skin is new to strong vitamin C, start a few times a week and build up gradually. If irritation persists, reduce frequency.

It uses a self-activating, anhydrous (water-free) format. Keeping the formula water-free helps the vitamin C stay stable until it meets the skin, so each application delivers a fresh, potent dose rather than a formula that can lose strength over time.

It is designed for daily use. Vitamin C pairs well with most routines, though strong oxidising ingredients such as benzoyl peroxide are best applied at a different time of day. If you also use exfoliating acids or retinoids, introduce products gradually and listen to your skin.

It is suitable for most skin types. Those with more sensitive or reactive skin, or anyone new to high-strength vitamin C, should introduce it slowly — a few times a week to begin with — and build up as tolerated.

Keep the cap closed and store away from direct sunlight and heat to help preserve the formula. As with any vitamin C, use within the period-after-opening shown on the packaging for best results.

Vitamin C is generally considered one of the gentler actives, but formulations vary and everyone is different. If you are pregnant or breastfeeding, we always recommend checking with your GP, midwife or a qualified skincare professional before introducing any new active product.