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Some of the serious side effects of Vitamin B12 include serous allergic reaction, narrowing or blocking of blood vessels, thrombocytosis (a disorder where your body produces too many platelets), low potassium levels in body, pulmonary edema (a condition where there is excess fluid in the lungs) and congestive heart failure

The absence of reported serious effects does not guarantee safety

In addition, fibroblasts are responsible for the secretion of various biological chemicals, one of which is known as the vascular endothelial growth factor (VEGF), which encourages the development of new blood vessels

Why Quality Matters in Vitamin Shots Not all vitamin treatments are engineered equal

If you develop a vitamin B-12 deficiency, intramuscular or subcutaneous injections may be necessary