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While there are no universally agreed-upon "optimal" ranges, practitioners and specialty lab testing companies may base these on the levels of micronutrients in the blood that are associated with the best health outcomes (not just the absence of disease) in clinical research studies
Both should be used only under rigorous laboratory control
Red, itchy, sensitive eyes are also associated with the condition
For some people, especially those with certain genetic variations like the MTHFR mutation, converting cyanocobalamin can be a challenge
Vitamin B12 is vital for health, required for proper red blood cell (RBC) formation + provides the body with energy
Avoid taking it with caffeine, which may reduce absorption
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