An excessive amount of B12 in our body can lead to some negative side effects. According to various studies, megadoses of the vitamin can lead to outbreaks of acne and rosacea. It can cause redness and you may have to suffer from pus-filled bumps on the face due to excessive Vitamin B12 in the body.
Our body cannot absorb excessive vitamin B-12 properly. It means if anyone takes very high amounts of vitamin B-12 then their body does not absorb B12 vitamin completely.