is too much glutathione harmful Vitamin C and supplementation: a review of their additive effects on exercise performance Glutathione Injections: Side Effects &

Vitamin B12 is best injected intramuscularly into the deltoid (upper arm), thigh, or gluteal muscle (buttocks)

PubMed, Maraslis, Flora Troina, et al

The 3-on-4-off schedule reduces risk by allowing hepatic recovery between cycles but does not protect against injury at supra-standard doses

2001 Dec;142(12):5182-9

Use strict aseptic technique and never share vials, needles, or syringes

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