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The nanomolar reality Research from the University of California demonstrated that GHK-Cu at concentrations of 0.01, 1, and 100 nanomolar all increased collagen and elastin production in human dermal fibroblasts

This is namely because "there is insufficient evidence on whether it would cause harm to humans" New England Baptist Hospital #sportsmedicine .

Bibcode:2000Sci...289.1567M

Or a seasoned biohacker

The Relation between Vitamin B12 Deficiency and Cancer In the past years, some researchers have claimed that Vitamin B12 deficiency could be associated with cancer

Regulators have looked at it closely
