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When total B12 levels are difficult to interpret, measurement of holotranscobalamin (active B12), methylmalonic acid (MMA) , or homocysteine can provide a clearer picture of functional B12 status, though availability and interpretation vary (for example, MMA rises in renal impairment)

In general, individuals who cannot absorb vitamin B12 correctly may have pernicious anemia

If you divide your daily dose into 2 doses (AM and PM injection) you will half these amounts so you get the correct amount per day, either 0.5 or 1 IU

You might experience some common mild side effects, like a bit of irritation at the injection site or perhaps a mild headache, but don't worry, these are quite rare