ghk-cu injectable clinical trial dose FDA scientists flag concerns with peptides as RFK Jr. tries to ease access : NPR GHK-Cu Peptide Therapy: The Definitive

If you dose at 7am and don't eat until noon, you're wasting the therapeutic window

Yes, injections bypass the digestive system entirely, making them useful for people with absorption issues

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Compounds with characteristics such as nonlinear pharmacokinetics, poor bioavailability, limited routes of elimination, and elimination via a pathway subject to genetic polymorphism appear to be more susceptible to ethnic factors, whereas compounds with linear pharmacokinetics, multiple routes of elimination, and a low potential for protein binding or drug interactions appear to be less susceptible to ethnic influence