Glutathione Serum Faded gets its smell from glutathione, an ingredient thats super effective at reducing the appearance of discoloration in week Glutathione has a cysteine chain that causes it to have a sulfur like Grace and Glow Bright & Smooth Deodorant Serum with Niacinamide and AH D Nelson Enterprises Glutathione Skincare Everything YSK from a Chemist One of our products smells like rotten eggs?! , Its actually because of an ingredient called Glutathione, which naturally contains Sulfur. , But dont let the smell fool you this ingredient will