This one may have ‘C’ in its name, but for us, it’s an A+++. Vitamin C is a do-it-all active that’s a major dermatologist favourite for all the right reasons. It slows down early ageing, gives your skin a glowy boost, and improves the appearance of acne and dark spots. Paired with sunscreen, it creates the ultimate sun protection combo, too. Pro tip: Make sure you get your vitamin C skincare in a dark bottle or store it in a cool and dark place. When exposed to light or air, it breaks down quickly and can become less effective.