Side effects from vitamin B12 supplementation are rare, and only occur with B12 injections, not oral supplementation, Allen says. Vitamin B12 injections are typically used to treat a deficiency in ...

Side effects from vitamin B12 supplementation are rare, and only occur with B12 injections, not oral supplementation, Allen says. Vitamin B12 injections are typically used to treat a deficiency in ...

The injections, while relatively safe, can pose some side effects if they are not tolerated well by the person taking them.

However, when considering shots, you'll want to consider a few things. One, they'll be more expensive than vitamin B12 ...