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The FDA does not approve glutathione injection for skin whitening
Local injection may provide faster onset at specific sites while systemic dosing offers broader distribution
If you take a high dose (1,000 mcg), your body absorbs only about 1% of it (NIH-a, 2021)
As more research and controlled trials become available, we will better understand how to optimize GHK-Cu treatment identifying the best doses, patient types, and protocols
Nat Commun 8 , 16087 (2017)
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