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Regarding conversion, we can cite only a manufacturers claim saying that EAC is metabolized in the skin into pure ascorbic acid (and the ascorbic acid content of EAC is very high - 86,4% - compared to the usual 50-60% Vitamin C content of other derivatives)

Focus on Sulfur-Rich Foods Your body needs sulfur to produce its own glutathione

Sulfur-Rich Foods: The body requires sulfur to manufacture glutathione

Key Takeaways: Liposomal glutathione reaches your cells with up to 8090% bioavailability, far higher than that of standard oral tablets, which are under 20%

Encyclopedia of Human Nutrition (Third Edition) pg

These free radicals can damage cells, causing aging, cancer, and other health problems