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 vs Niacinamide: Which Is Best for Glowing Skin? Glutathione System from Cyanobacteria to Higher Eukaryotes Encyclopedia MDPI Glycine is sold across the wellness internet as a sleep aid, a collagen builder, and an anti aging amino acid for glutathione synthesis. The sleep evidence is real. The other two are mechanism plausible