reaction to vitamin b12 injection Side Effects of (Common and Serious) Vitamin B12 - Energy &

It takes weeks for B12 to build up in your body." The first time, or even the second time, a person receives B12 shots, you might not notice any difference

Before your first injection Get baseline bloodwork done

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[1] Other rare side effects noted (mostly in older literature or high-dose use) include: polycythemia vera and peripheral vascular thrombosis in patients receiving repeated injections (though these associations are not well understood, they were listed in prior product literature as possible adverse events)

Key Takeaways Vitamin B12 is vital for neurological function and DNA synthesis

Hydroxocobalamin , the most commonly used form in the UK, has a significantly longer duration of action compared to cyanocobalamin