Recommended as a monthly injection, Vitamin B12 can also improve fatigue, boost the immune system, regulate sleeping patterns and circadian rhythm, and even help with weight loss
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In the absence of impaired kidney function, an elevated MMA level in conjunction with elevated homocysteine suggests either a vitamin B 12 deficiency or a combined vitamin B 12 and folate deficiency (32)
For instance, those allergic to cobalt or with Leber's disease should avoid vitamin B12 injections