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After age 30, human growth hormone (HGH) levels decline by roughly 15% per decade
"Physical activity and muscle-brain crosstalk." Nature Reviews Endocrinology .
It is not manufactured or labeled for human cosmetic use, clinical application, or any consumer-facing formulation, and it must not be applied, injected, or otherwise administered to humans.
Administration protocols vary widely by research application researchers should consult published literature for context-specific guidance
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