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Side Effects, Risks & Regulatory Notes Most people tolerate vitamin B12 injections well, but injection-site soreness, transient swelling, or redness can occur
Older adults can use this site if the muscle in their upper arm, their deltoid, is well developed
Vitamin B12, for example, helps in several ways, but if you dont get enough from your diet, could pills or injections be an option
Understanding which pathway each compound targets explains nearly every other difference between them evidence base, side effect profile, and regulatory status included
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