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Thats because Iodine is inexpensive, easy to carry, and highly reliable
Recommended for individuals with absorption issues and severe deficiencies, B12 injections are considered more effective because they bypass the digestive tract and deliver the vitamin directly into the bloodstream
They are often sufficient for correcting mild dietary deficiencies (e.g., in vegans who dont consume fortified foods) and can sometimes be used for maintaining levels after an initial course of injections, provided absorption is adequately monitored by a healthcare professional
For suspected macro-B12, precipitation with PEG is the test most often reached for, though it is nonspecific and can remove B12 that is fully available to cells, so direct measurement of the binding proteins, haptocorrin and transcobalamin, may be more informative when it is available
