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oral glutathione bioavailability randomized trial richie 2015 Augmented Absorption from Mucosa and its Effect on Skin Pigmentation: A Clinical Review Frontiers | Glutathione: Pharmacological aspects
Description
PDQ Thyroid Cancer Treatment

doi: 10.3233/JAD-2010-1238

That is less than half a milliliter

This is called hormesis

Potential concerns include local injection reactions, immune responses to copper, and theoretical risks from unintended growth pathway activation
