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Association of vitamin B12 with obesity, overweight, insulin resistance and metabolic syndrome, and body fat composition

In addition to limited absorption via the IF, the intake of high-dose supplements leads to passive diffusion, i.e., the vitamin can freely enter the bloodstream without IF binding and receptor uptake

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Sometimes, we also test methylmalonic acid (MMA) or homocysteine levels to confirm a deficiency

These are great for when you need to be very precise or take small amounts, like when you need to change your insulin for meals or snacks