What happens if you take too many B12 injections?
What happens if you take too many B12 injections? However, supplementing with excessively high levels of B12 has been linked to some negative side effects. Several studies have shown that megadoses of the vitamin can lead to outbreaks of acne and rosacea, a skin condition that causes redness and pus-filled bumps on the face. Can vitamin B12 Injections be harmful? Safety and Side Effects Vitamin B12 injections are generally considered to be very safe. They have no major side effects. However, in very rare cases, some people can experience side effects caused by allergic reactions or sensitivity ( 29 ,...