Serious Reactions That Require Medical Attention Whilst most reactions to B12 injections are mild, certain symptoms indicate potentially serious complications requiring prompt medical assessment
Why do I feel so bad after B12 injections? Can this really happen
Side effects of B12 deficiency can include decreased cognitive function, fatigue, lethargy, feeling faint, depression or irritability, headache, balance issues and more
The Neurological and Cognitive Glitches Perhaps the most alarming signs are the ones that affect your nervous system and brain function
Without adequate supplies of B12, most of the cells in your body will struggle to take in enough oxygen, which can affect everything from your energy levels to your mood and concentration, Sukol says
Vitamin B12 has many tasks in the body: building the genetic substance DNA, multiplication of cells, catalyst for energy metabolism, protection of nerve cells and formation of red blood cells