b12 injections vs pill vs. Oral Supplements: Which Is Better? B12 Injections vs Pills: Richmond's
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doi: 10.3122/jabfm.18.3.205

It is important to note that whilst B complex supplements are widely available over the counter, they are not a substitute for a balanced diet

Along with alcohol as well as nicotine, long term antibiotic use could also reduce the stomachs ability to utilize and absorb vitamin B12

Emerging therapeutic strategies for obesity
