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The ~1-2 mg/mL serum figures circulating in community sources are DIY formulation conventions, often borrowed from how GHK-Cu cosmetic serums are mixed, rather than results of any AHK-Cu human study
Its primarily found in the modern diet in animal products, so vegans and vegetarians need to supplement with B 12 regularly
When intrinsic factor is lacking, oral B12 may not be absorbed effectively
Is CPT Code 96372 Covered by Medicare
Simple injections can even be used to gently manipulate nerves, diminishing their ability to transmit pain signals to the brain
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