The FASEB Journal , 29
The FDA does not require pre-market approval for cosmetic ingredients the way it does for drugs, so a topical GHK-Cu product can be sold legally as a cosmetic without being an "FDA-approved" drug
5-Oxoprolinase deficiency is a very rare autosomal recessive disease characterized by 5-oxoprolinuria, and a very heterogeneous clinical presentation, including renal stone formation, enterocolitis, mental retardation, neonatal hypoglycemia, microcytic anemia and microcephaly (Njalsson and Norgren, 2005
[DOI] [PubMed] [Google Scholar] 15.Drevets W.C., Gautier C., Price J.C., Kupfer D.J., Kinahan P.E., Grace A.A., Price J.L., Mathis C.A
Thankfully, your body can recycle GSSG back into GSH with the help of an enzyme called glutathione reductase, using energy from another helper molecule called NADPH
Another issue pertaining to pure and high-quality intravenous glutathione solution is the extremely high cost