best vitamin c to take with glutathione GHOST Basics + Supplement for Men & Women – 500MG PureWay-C, 250MG L-Glutathione for Immune Health Support, Detox & Cleanse – Vegan, Soy-Free & Gluten-Free Glutathione vs Vitamin C: Which
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While TRT directly provides exogenous testosterone, Testagen theoretically supports natural production through gene regulatory effects

Regarding the effects as you mentioned, digestion etc I didn't feel anything special around those

Clinics offering them purely for cosmetic lightening should be approached with caution and discussed thoroughly with a qualified doctor

Our body produces them naturally

Vickery BH, Avnur Z, Cheng Y, Chiou SS, Leaffer D, Caulfield JP, et al