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The injection pen also has the expiry date mentioned next to the brand name
Fast-Acting: Unlike oral supplements, which must be digested and absorbed through the intestines, B12 injections provide a rapid boost to B12 levels in the body
Presented for research literature review only Michejda CJ (1987)
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Injections, while requiring a bit more commitment and potentially a visit to a healthcare provider, offer a fast-acting and highly bioavailable B12 source
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