What is glutathione and why must we protect patient access to it? 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 Glutathione: Master Antioxidant, Reducing Oxidative Stress, and Detoxification Why does Faded Serum smell? Glutathione! an ingredient thats super effective at reducing the appearance of discoloration in weeks Glutathione has a cysteine chain that causes it to have a sulfur