Trends Mol Med 17(12):714724
"Antioxidant mechanisms of glutathione in skin protection: From molecular pathways to clinical applications." Free Radical Biology and Medicine, 168, 187-202.
For lyophilized peptide, repeated freeze-thaw cycles aren't typically a concern (the peptide is already in a stable solid state)
Glutathione Glutathione is produced exclusively in the cytosol, yet it is delivered to other cellular compartments, including the mitochondria, peroxisomes, endoplasmic reticulum, and the nucleus, as well as the extracellular space to be utilized by other tissues
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I often use the example of vitamins - unless your diet is deficient in something, or you have a specific medical need, the only consistent finding (beyond the vitamin D in winter) is darker urine