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The choice depends on the patients health, how bad the deficiency is, and the doctors advice

Aroda, MD, Director of Diabetes Clinical Research at Brigham and Womens Hospital and Associate Professor of Medicine at Harvard Medical School

Fatigue and Weakness: One of the most significant symptoms of B-12 deficiency is fatigue and weakness

A deficiency can increase the risk of various health issues, including: Cancer Heart disease High blood pressure Obesity Type 2 diabetes Depression Memory and cognitive problems Parkinsons disease Osteoporosis Autoimmune disorders Infections Its best to consult a healthcare provider such as Regenics to determine the best approach for your needs, especially if you have existing medical conditions or are on medication