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Clinical Science

Ten years ago, you were able to order B12 self-injection kits online, and inject in the comfort of your home

People taking metformin, the common diabetes drug, are known to develop B12 deficiency as well, and people who avoid animal products can be deficient

Injection into the muscle The shot is administered into your muscle tissue, which acts as a reservoir

When 2ml makes sense Two milliliters is the standard recommendation for most researchers

For those requiring supplements, cyanocobalamin and hydroxocobalamin are both effective forms available in the UK, with hydroxocobalamin preferred for injections due to superior tissue retention, as noted in the British National Formulary