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The four forms (vitamins) of B12 are all deeply red colored crystals and water solutions, due to the color of the cobalt-corrin complex (biologically relevant enzyme, it is the "core" of vitamin B12)
While Vitamin B12 can be obtained from dietary sources such as meat, fish, dairy products, and fortified cereals, some individuals may have difficulty absorbing it due to medical conditions or dietary restrictions
While C677T and A1298C do decrease enzyme activity and make MTHFR function suboptimal, carriers can generally expect to have no trouble converting enough homocysteine to methionine
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