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The last stage of GSH synthesis involves the addition of glycine to -glutamyl-cysteine, which is catalyzed by GSH synthetase (Figure 3)

Some people get stomach upset, including nausea, cramps, or loose stools

NAD+ is used exclusively in laboratory research investigating nicotinamide adenine dinucleotide research and cellular energy metabolism pathway studies

Controlled human trials exist, but they're limited in size, focused mostly on topical cosmetic use, and usually last only a few weeks or months. That means a lot of the exciting claims, especially around gene expression, systemic repair, and anti-aging effects, haven't been confirmed in large-scale human studies