Methylcobalamin 10,000mcg injectable, 10mL (lyophilized) Defy Medical B12 deficiency can cause mood swings, difficulty concentrating, pale skin, compromised immune system, infertility, fatigue, hair loss and so much more. If you are vegetarian or vegan, you may be Understanding Vitamin B12 Deficiency in Cancer Patients Vitamin B12 Deficiency Harvard Health
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