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Dozens of FDA-approved estrogen, progesterone, and testosterone products are available in various strengths and delivery systems, and these products have undergone rigorous review for safety, efficacy, and manufacturing consistency

or Canada as an ingredient in dietary supplements and neither is approved as a drug, as there is a lack of human clinical research demonstrating their efficacy and safety

10.1016/s0014-5793(01)02140-8 57 KimK

That alone would be noteworthy, but the anti-inflammatory story doesnt stop there

While some studies suggest that oral glutathione may have localized effects in the digestive tract or that the constituent amino acids can be re-assembled into glutathione intracellularly, the efficiency of this process remains significantly lower than direct administration