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This is an anecdotal community standard, not an approved or clinically proven protocol
In our experience, its one of the best B12 injection sites because its easy to reach and usually has enough fat
Competing interests None declared
Oral Supplements: A Quick Comparison For people with a confirmed deficiency, especially those with absorption problems, injections generally act faster than oral supplements: Injections: bypass the gut, reliably reach the bloodstream, and often produce noticeable changes in energy and mental clarity within days for those who are deficient
But if you have nerve damage from your lack of B12, it could be permanent
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