best collagen with glutathione vs. Glutathione: Which Is for Your Skin? – CYMBIOTIKA BB LAB Collagen Glutathione White,

One of the most common glow questions is: How many mg of glutathione should I take each day? And the real answer is simple

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The dosage of -CG was chosen according to the result of our preliminary study in which the piglets fed a liquid diet containing 1% or 2% -CG exhibited severe diarrhea and a depression of feed intake, while those fed a liquid diet containing 0.5% -CG showed a slight reduction in feed intake and a moderate increase in diarrhea incidence

The reason comes down to chemistry

Poynten, A

10.1073/pnas.0507360102 Proc