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These include the competing effects of the formation of cobalamin-like molecules in our body (the so-called cobalamin analogues or pseudo-cobalamins), which may impair the proper action of the good cobalamin
You can even make your own by submerging a hand towel in water, placing it in a large plastic zip-close bag, and microwaving it for 2 minutes
Often, the next test is serum methylmalonic acid (MMA), a functional marker of B12 deficiency that's produced when there's not enough active vitamin B12 present
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