b12 injection site Vitamin Sites: All You Need to Know How to self-inject intramuscular vitamin
Description
A blood test is the only reliable way to determine whether B12 deficiency is causing fatigue

Nature 444 (7122), 10221023
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Drug interactions are unmapped

The evidence is clear: for most patients, high-dose oral supplements are as effective as injections

A 3ml or 5ml syringe with a long needle works well for most vials

These can be met with combined supplements