Some nutritionists recommend increasing the intake of the amino acids cysteine and glutamate, which make glutathione, but this hasnt been studied either
The standard dose is 1000 mcg, given as an intramuscular or subcutaneous injection
Avoid using with retinoids: Retinol, tretinoin, and other retinoids increase cell turnover, which may cause excessive irritation when combined with copper peptides
You might see injectable GHK-Cu offered by online gray-market retailers selling supplies from unregulated pharmaciesbut this is a big red flag and safety risk
After wash-out and crossover, increases were again most evident when HA + GSH-C4 was introduced
Reputable manufacturers submit their products to independent laboratories that verify the supplement contains what the label claims and is free from contaminants such as heavy metals, pesticides, and microbial contamination