Take vitamin B12 on an empty stomach in the morning or early afternoon to maximize absorption and avoid sleep disruptions.

B12 shots can have mild side effects like diarrhea and swelling at the injection site. Vitamin B12 injections are an effective way to treat a deficiency, but they're not for everyone. In fact ...

But the B vitamin complex is large, and some of these vitamins, like B12, get more attention than others. With that, it’s fair to wonder about the difference between vitamin B vs B12.