b12 injection side effects in women Vitamin Deficiency: Symptoms, Causes & Treatment Vitamin B-12 Benefits | Uses

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To build NAD+, your cells rely on a vitamin-B3 form called nicotinamide

[91] Since only bacteria and some archea possess the genes and enzymes necessary to synthesize vitamin B 12 , plant and algae sources all obtain the vitamin secondarily from symbiosis with various species of bacteria, [5] or in the case of fermented plant foods, from bacterial fermentation