What are the side effects of vitamin D2 injections?

Side effects of vitamin D2 injections may include persistent headache, diarrhea or constipation, arrhythmia, occasional mental abnormalities, skin itching, muscle pain, severe abdominal pain, nocturnal polyuria, weight loss, and other symptoms. Most people who maintain a normal diet do not suffer from vitamin B2 deficiency; only a small number of individuals with irregular eating habits or excessive dieting may become deficient in vitamin B2. In such cases, one should visit a hospital for evaluation and use supplements only under medical supervision.