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Vitamin B6 (pyridoxine): It interferes in amino acid metabolism and plays a role in transferring sulfur from methionine to serine to form cysteine, in addition to its important role in the formation of nicotinic acid, starting from tryptophan

B12 plays a key role in several processes like producing red blood cells, converting food into energy, and producing nerves

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

This vitamin is required for proper development and function of your nerves, brain and blood cells

Side Effects of Vitamin B12 Shots Most people handle B12 shots fine

As AUA guidelines state, administration of exogenous testosterone in someone with normal serum testosterone values is not recommended