Vitamin C derivatives are renowned for their skin-brightening, tone-evening abilities – but they’re notoriously difficult to keep stable. This exceptionally stable solution is water-free and features an ‘ethylated’ (a science-y term for a compound in which the hydrogen of an alcohol is replaced by a metallic atom, usually sodium or potassium) form of ascorbic acid, which acts directly like vitamin C, allowing for faster, more visible results and a much better stability profile than any known direct-acting form of vitamin C. Boosting skin’s radiance and appearance of healthy, The Ordinary’s Ethylated Ascorbic Acid 15% Solution will brighten your skin and even out its tone, minimising the appearance of dark spots and pigmentation. The Ordinary offers a host of vitamin C-based products to brighten skin – opt for this one if you’re looking for a ‘high’ potency option and a ‘light oil’ texture.