Vitamin C: Morning or Night? Here's What the Science Says

Morning application lets Vitamin C's antioxidant properties help neutralise UV-induced free radicals throughout the day, working alongside (not instead of) sunscreen. Night application is also valid, especially for those who find their serum destabilises in daylight, or who prefer to pair actives like retinol on alternate nights. What matters most is consistency and correct storage — keep the bottle away from direct light and heat regardless of when you apply it, and replace it once it turns noticeably yellow/brown.