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Third-party tested via HPLC Certificate of Analysis included 99% purity verified FREE shipping on every order | Same-day dispatch before 2 PM EST GHK-Cu (glycyl-L-histidyl-L-lysine copper complex) is a naturally occurring copper-binding tripeptide (MW 403.93 Da, CAS 49557-75-7)

18,19,23,24 Figure 4

NAD+ therapy in age-related degenerative disorders: A benefit/risk analysis

On the contrary, a new study showed you can get away with even less

[PMID: 958327] PubMed record related to this compound for laboratory literature review

#5 Headaches (low to moderate risk) Headaches or migraines can be triggered, especially in sensitive individuals