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Testing before supplementing The most logical approach involves testing b12 status before adding supplementation

An accurate dosage calculator must reflect uncertainty, present ranges rather than absolutes, and clearly communicate the compounds experimental status

Intrinsic factor, a protein that shuttles B12 through the absorption process, becomes saturated after a meal containing an above-average amount of B12 and about 4 to 6 hours are required before it can efficiently absorb another dose (IOM, 1998)

Vitamin B12 injections can be given in three ways: into the muscle (intramuscular), under the skin (subcutaneous), or through a vein (intravenous)

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However, research is still ongoing, and results may vary