Well, the answer for that is complicated by the fact that WADAs own list of criteria for what gets a substance on the banned list is convoluted
Both compounds arrive as lyophilized powder and need reconstituting with bacteriostatic water before use, which is its own skill worth getting right
Although critical glutathione levels will lower as we age, depletion can be accelerated by stress, illness, infection, poor diet, alcohol, cigarettes, trauma, and environmental toxins
When you use a pre-blended standardized preparation, its easier to reduce inconsistencies across different studies
Glycine was best described by Prez-Torres as the smallest non-essential, neutral and metabolically inert amino acid, with a carbon atom bound to two hydrogen atoms, and an amino and a carboxyl group. It sounds like an impressive amino acid