What makes it remarkable is its simplicity: glutathione is a tripeptide , built from just three amino acids cysteine, glutamic acid, and glycine
LAT1 ( SLC7A5 ) imports BCAAs and several essential amino acids (e.g., phenylalanine, leucine, isoleucine, tryptophan, histidine, and tyrosine) with high affinity in exchange for the efflux of intracellular histidine, tyrosine, and glutamine (Nicklin et al., 2009
Supporting phase II detox of the 2-OH and 4-OH metabolites The 2-OH and 4-OH estrogen metabolites are cleared out in phase II primarily through methylation , which is carried out by the catechol-o-methyltransferase (COMT) enzyme
These alternatives can provide similar benefits without the potential adverse effects on glutathione levels
Extremely cheap peptides are almost certainly compromised, but expensive peptides are not guaranteed to be good