Meanwhile, if you have a vitamin B12 deficiency, you might require a shot ... They can also cause side effects, such as skin rashes, headaches, itching, diarrhea and nausea. Meanwhile, supplements ...

If you're deficient in vitamin B12 you might experience irritability, fatigue, and canker sores. An iron deficiency can cause ... by the body naturally when skin is exposed to ultraviolet rays ...

B12 shots will benefit only those with a B12 deficiency and people with some underlying conditions. No research indicates that B12 shots will help with weight loss or benefit healthy individuals.