On one hand, activity at such vanishingly small concentrations is consistent with GHK-Cus proposed role as a physiological signaling molecule rather than a blunt pharmacological agent, which is genuinely intriguing
Some of these herbs turn out to work through a mechanism that sounds familiar: modern research on Manjistha and licorice has found they can inhibit tyrosinase too, the same enzyme glutathione is thought to act on
Zhang M, Liu S, Chua MS, Li H, Luo D, Wang S, et al
I am based overseas but ordered through your website
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Refrigeration (2-8C / 36-46F): The Standard Protocol This is the sweet spot