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 Glutathione Vs Glutamine Which is Better for Your Skin Health? Thiamidol: A Game Changer for Dark Spots, Hyperpigmentation Clinikally Best Ingredients for Melasma Do You Need All These Ingredients for Melasma? No. You don't need to use everything at once. Using too many strong actives can irritate the skin and worsen Effective Tyrosinase Inhibition by Thiamidol Results in Significant Improvement of Mild to Moderate Melasma ScienceDirect