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Then, have a colleague check it

doi: 10.1016/j.freeradbiomed.2018.05.086

Nose-to-brain delivery of lipid-based nanosystems for epileptic seizures and anxiety crisis

PubMed: (peer-reviewed) Borkow G, et al

Individual biochemistry, receptor sensitivity, and unknown factors mean some people simply don't respond to GHK-Cu as expected
