can a b12 injection make you feel tired Shots Side Effects And How To Treat Them Vitamin B12 Injection | Causes

extreme tiredness a lack of energy problems with memory and ability to focus sore or red tongue a pale yellow ting to your skin pins and needles vision disturbances depression changes in mood changes in the way you walk and move

Archives of Pharmacal Research, 30(7), 834-839

Do not take any lipotropic injections containing phentermine if you have cardiovascular disease, hyperthyroidism, glaucoma, take monoamine oxidase inhibitors, or have a history of drug dependency

It is obtained from your diet and vegans are more likely to have a deficiency

One cause of B12 deficiency includes pernicious anemia, a condition that results in a reduction of red blood cells when the intestines cannot absorb enough vitamin B12

Niacinamide does not cause the dramatic flush of niacin, so titration to mitigate flushing is usually not necessary