La Roche-Posay Mela B3 Serum is the daily anti-blemish facial care with 10% Niacinamide and the new, unique mechanism of action Melasyl . Niacinamide , a form of Vitamin B3 , is a water-soluble vitamin widely used in dermocosmetics . It is known for its ability to soothe the skin , strengthen the epidermal barrier , and correct blemishes . Melasyl the new active ingredient to combat hyperpigmentation like never before. Melasyl ensures superior efficacy against hyperpigmentation , compared to 5 reference active ingredients. Melasyl has a new, unique mechanism of action, it regulates the overproduction of melanin before it leaves visible marks on the skin. Clinically proven correction of blemishes , even stubborn ones. Clinically proven effectiveness on every phototype and every type of spot, including age spots , sun spots , and discolorations ( acne marks, scars ). It evens out skin tone , reduces acne scars , and reduces hyperpigmentation . It ensures optimal effectiveness without clogging pores, with very good tolerance even on sensitive skin . Recommended by dermatologists .