Other ingredients include: Purified water, Glycerol, Sodium L-Ascorbate (C), Carnosic Acid and a little Seabuckthorn Extract to ease the taste
Regarding the active site of GSH peroxidases, the selenocysteine localized in position 46 (Sec 46 ) showed to be essential for the human GPX4 [30]
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A personalized formulation of glutathione, vitamin C, hydration fluids and (where indicated) supportive cofactors is then prescribed and compounded with pharmacy-grade ingredients
It is not a toxicity concern but an efficacy consideration
(Source 2) Our modern food supply composed of highly processed and highly palatable food is calorie-rich, but nutrient poor