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Both act through the ghrelin/GHSR pathway, but Ipamorelin is generally discussed as more selective, while GHRP-6 is an older GH-releasing peptide often associated with appetite-related signaling

doi: 10.3389/fped.2017.00121 13 Centers for Disease Control and Prevention

Though the raw building blocks (like acrylic acid) can be irritating on their own, cosmetic-grade versions go through purification to keep levels extremely low

19 The bioavailability of orally administered cysteine is believed to be the rate-limiting step for the synthesis of glutathione, 10 although the amino acids glutamate/glutamine are also integral to GSH synthesis