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FDA.gov (2026) 10
He did advise subcutaneous b12 injections
The commercial enthusiasm is grounded in real science: GHK-Cu stimulates collagen synthesis at extraordinarily low concentrations (picomolar), modulates thousands of human genes, and has shown measurable wrinkle reduction in clinical studies
This pharmaceutical design principle appears in several modern peptide therapeutics
What we do know is that maintaining levels above 400 pg/mL ensures optimal red blood cell production critical for oxygen delivery during intense training
Additionally, inflammation in the gut may disrupt communication between intestinal cells and the endocrine system, affecting hormones that regulate appetite and energy expenditure
