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can vitamin b12 injections cause hair loss b12 encourages hair growth and helps prevent hair loss! Vitamin B and Hair Loss:
Description
Vitamin B12 shots and vitamin B12 injections are the same treatmentboth terms refer to the direct intramuscular administration of vitamin B12 for rapid absorption and immediate wellness benefits

These injections may cause (11): Diarrhea or constipation Dry mouth Fatigue Incontinence Increased heart rate Anxiety Insomnia Feet and hand numbness Nausea Vomiting Palpitations Elevated blood pressure The intensity of the side effects of lipotropic injections can vary
Cancer Metast Rev

If you have some of those symptoms especially if you have a low red blood cell count you should talk to your doctor about further blood tests for vitamin B12