Yes glycine can be a surprisingly inexpensive, effective alternative to many overpriced collagen powders, but with some important nuances. Here's a clear breakdown of what glycine is, how it compares to Glutathione Homeostasis and Functions: Potential Targets for Medical Interventions Lushchak 2012 Journal of Amino Acids Wiley Online Library Glycine as a conditionally essential amino acid and its relationship to l serine Metabolism Clinical and Experimental Three amino acids walk into a bar.the adventures of supporting glutathione synthesis in fatty liver disease using serine & nicotinamide riboside Dr. Kara Fitzgerald GlyNAC Clarity 30 servings Glutathione synthesis. Semantic Scholar