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One study reported that glutathione improved blood circulation, increasing the ability to walk without pain in patients with peripheral artery disease, who received glutathione through intravenous infusions twice daily for five days [4]
Despite these differences, most of the dietary glutamine and glutamate provided to neonates is consistently shown to be used by the intestines (84, 85)
For those interested in the broader science of how these amino acid chains function in the body, reading up on peptide benefits, types, risks, and weight loss research can provide helpful context on why compounds like GHK-Cu are so widely discussed