What is Thiamidol? Thiamidol is a patented ingredient by Beiersdorf that helps to reduce dark spots and hyperpigmentation. Proven in 70+ clinical studies to reduce hyperpigmentation and prevent it from reappearing Eucerins Thiamidol Cream for Hyperpigmentation Treatment Innovations in Skin Lightening: New Topicals for Hyperpigmentation PRIME Journal Benefits of Thiamidol and Vitamin C for Skin Care What is Thiamidol? Thiamidol is a patented ingredient by Beiersdorf that helps to reduce dark spots and hyperpigmentation. Proven in 70+ clinical studies to reduce hyperpigmentation and prevent it from reappearing I layer multiple brightening ingredients to keep my skin tone even and fade dark spots. In the mornings, I use a vitamin C antioxidant serum + thiamidol, and (pre pregnancy) a retinoid at