La Roche-Posay Pure Vitamin C10 Serum

La Roche-Posay built its reputation on sensitive skin, and the Pure Vitamin C10 serum shows why. It combines 10% pure vitamin C for brightening and smoothing with a touch of salicylic acid to refine texture and hyaluronic acid for hydration, then buffers the lot with the brand's soothing neurosensine and thermal water, which the brand positions for reactive complexions, though tolerance to its ascorbic acid and salicylic acid varies from person to person. The result is a lightweight, quick-absorbing serum that aims to even tone and soften the look of fine lines over a few weeks without the tightness or redness some stronger formulas provoke. Because it contains real ascorbic acid it can still tingle on very reactive days, and the salicylic acid means it is not the pick for anyone sensitised to exfoliating acids — the maker positions it for sensitive skin, but individual tolerance varies, so patch testing is sensible. It is also easy to find in UK pharmacies.