In addition to excessive intake of dietary supplements, parenteral administration of vitamin B12 may be another cause of excess, which is likely associated with an immune system response to produce anti-TC II antibodies
UTIs and PMS can both cause bloating, cramping, and fatigue
More rarely, more serious reactions may occur, such as allergic reactions (urticaria, itching, shortness of breath, facial swelling), heart failure in people with pre-existing problems, or hypokalemia (low potassium levels) at the beginning of treatment due to increased hematopoiesis
An untreated vitamin B12 deficiency can lead to neurological problems or pernicious anemia, which occurs when your body doesnt have enough B12 to produce the amount of red blood cells it needs ( Vitamin B12 shots are typically the most common way to prevent or treat a deficiency
These injections often contain a mix of vitamins, amino acids, and other nutrients to give your metabolism a kickstart