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Vitamin B12 Dosage: How Much Should You Take per Day? - Healthline
Vitamin B-12 - Mayo Clinic
How Much Vitamin B12 Is Too Much? - Healthline
How much vitamin B12 should I take daily? - Everlywell
Vitamin B12 - Health Professional Fact Sheet
Ask the Doctors - Are large doses of B12 safe? - UCLA Health
Cyanocobalamin Dosage Guide + Max Dose, Adjustments - Drugs.com
Vitamin B12 - Consumer - Office of Dietary Supplements - Vitamin B12
Vitamin B-12: How much is too much? - Medical News Today
Vitamin B12 Dosages: Your GoodRx Guide - GoodRx