oral vs injectable b12 Efficacy of different routes of vitamin supplementation for the treatment of patients with vitamin B12 deficiency: A systematic review and network meta-analysis Vitamin B12 Injections vs. Oral

Vitamin B12 helps the body convert food into energy and supports the normal functioning of the nervous system

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Folic Acid (Vitamin B9) This vitamin is essential for red blood cell production and DNA repair and production

Read the full study: Effects of oral administration of a synthetic fragment of human growth hormone on lipid metabolism (Am J Physiol Endocrinol Metab 2000)

Conditions where the bone marrow overproduces blood cells, including polycythemia vera, chronic myeloid leukemia (CML), and hypereosinophilic syndrome , can cause elevated B12 levels