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Its worth noting that adverse effects are not common with high supplemental vitamin B12 intake, however, there is also no strong evidence to show that it has benefits in people who are not already deficient (largely due to the fact that your body only stores as much B12 as it needs and any excess will be excreted through your urine)

(December 2008)

2016;7:e196

The four forms you'll encounter are methylcobalamin (active methyl form your body uses directly), adenosylcobalamin (the other active coenzyme form, involved in mitochondrial energy), hydroxocobalamin (a natural form often used in injections with a longer half-life), and cyanocobalamin (a synthetic form widely used in cheap supplements and fortified foods)

It is whether a licensed provider screened you, ran your labs, sourced the compound responsibly, and adjusted your dose over time