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This is because oral vitamins must pass through your digestive system, where absorption can vary based on your metabolism, gut health, and other factors
The entire process takes mere minutes during an office visit
The oral daily dose far exceeds the vitamin requirement because the normal transporter protein-mediated absorption is absent, leaving only very inefficient intestinal passive absorption
Journal of Orthopaedic Research, 33 (7), 1024-1033
The two are closely related (same region of growth hormone, slightly different structure)
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