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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

Its systemic reach is one of its defining characteristics and what separates it from more localized peptides

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Expression of hepatic insulin-like growth factor-I and insulin-like growth factor-binding protein-1 genes is transcriptionally regulated in streptozotocin-diabetic rats