IM injections involve the direct administration of vitamin B12 into the muscle tissue, typically in the form of hydroxocobalamin or methylcobalamin
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Weight changes may begin in a few weeks, while more significant changes may take time and consistency
In addition, most B12 supplements come in the form of pills, and most people do not receive the full benefit from digesting a pill while some cannot absorb the nutrients at all
Older adults may aim to maintain B12 levels as absorption naturally declines with age
[DOI] [PMC free article] [PubMed] [Google Scholar] 128.Tansey JT, Sztalryd C, Hlavin EM, Kimmel AR, Londos C