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Most oral glutathione supplement benefits are lost due to liver metabolism and digestive enzymes

GHK-Cu and copper uglies Albeit rare, some people may experience a side effect from using GHK-Cu or other copper peptides known as copper uglies. Though there arent any studies on this phenomenon, some users have anecdotal reports of copper peptide skin care products leading to what looks like accelerated skin aging instead of antiaging

A Therapeutic Use Exemption (TUE) would be required for legitimate medical use by an athlete, but it is very difficult to obtain for S2 substances

Fever is a possible sign but often the temperature will drop instead