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Food sources include eggs, poultry, and dairy products Glycine: Research indicates this amino acid is found in protein sources such as meat, fish, and legumes Glutamic acid: Studies suggest this amino acid is present in many protein-containing foods Supporting Nutrients Peer-reviewed research suggests that certain vitamins and minerals may support the body's glutathione systems: Selenium: Studies indicate selenium functions as a cofactor for glutathione peroxidase enzymes

Animals were pre-acclimated with vehicle injections for three days to reduce injection stress

In COPD studies, GHK-Cu at 10 nanomolar concentration restored lung fibroblasts ability to contract and restructure collagen, a function that is severely compromised in COPD patients

doi: 10.1111/jvp.13002, 53