Folate, vitamin B6, and vitamin B12 are all required for the conversion of homocysteine into the sulfur-containing amino acid methionine
The main risk associated with GHK-Cu in clinical practice is sourcing quality, unregulated compounding pharmacies or unverified online vendors may produce peptide preparations with impurities that cause reactions incorrectly attributed to the peptide itself
When using acetylcysteine to treat a patient with established hepatic injury, continue acetylcysteine as an ongoing infusion until the liver recovers (dont stop after 24 hours)
This isn't arbitrary
Natural glutathione production is easily disrupted however, and stores can become quickly depleted by the ravages of poor diet, stress, medications, infections and radiation and other toxins
Apart from differential compartmentation, one possibility is that this array of enzymes guarantees robust redox homeostasis, even at the expense of redundancy, consistent with loss-of-function studies for APX and PRX isoforms in the chloroplast (Awad et al