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For one example, the speed at which new blood cells are produced is, in part, regulated by a hormone called erythropoietin (EPO), which itself is produced by the kidneys

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By your 60s, levels drop by more than 60%, and so does the signal that tells your skin to renew, your hair follicles to thicken, and your tissue to repair

It is central to injury response and cellular repair

Sublingual absorption of large peptides is inherently variable because it depends on factors like sublingual blood flow, saliva production, mucosal integrity, and even how much the user moves their tongue during the holding period