Best Glutathione Manufacturer is Vatave Healthcare Reduced Glutathione Detox Supplement Markit Health Viral claim says GHK Cu reset nearly 4,000 genes to a younger state and increased collagen production in a preclinical study. This refers to research on GHK Cu, a naturally occurring copper binding peptide that The best glutathione supplement is the one that works for your body. Sounds simple, doesn't it? But regular, run of the mill oral glutathione is only absorbed by the body at about 3 5%