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Outer Upper Arms: The area is easily accessible for self-injection and often used for smaller dose administrations
Approximately 1% of oral B12 is absorbed through passive diffusion, independent of intrinsic factor, making high doses effective even in pernicious anaemia
To support this metabolic process, some clinicians recommend co-supplementation with a methyl donor such as trimethylglycine (TMG) while on NAD+ injections
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