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Sources Food sources Only certain bacteria and archaea can synthesize vitamin B 12 (123, 124)
With a vitamin B12 deficiency comes the risk of suffering from megaloblastic anemia, including symptoms of fatigue, weakness, pale skin, lack of appetite, infertility, and unexplained weight loss
Many clinics use pre mixed or mass- produced formulations that can lose potency, contain unnecessary fillers, or fail to meet medical grade standards
These use the AdoB 12 (adenosylcobalamin) form of the vitamin
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