Avon Skin So Soft Glutathione Lotion with Marula Project Vanity Masking the Off Taste and Odor of Glutathione While Increasing Bioavailability If a serum smells bad it usually means it works., This glutathione serum smells like rotten eggs and thats your first clue its highly concentrated. Glutathione is known for targeting Grace and Glow Bright & Smooth Deodorant Serum with Niacinamide and AH D Nelson Enterprises