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Thats because Iodine is inexpensive, easy to carry, and highly reliable
Tests like serum B12 levels and methylmalonic acid (MMA) tests help
they are not for human consumption, medical, diagnostic, cosmetic, veterinary, or any other non-research application
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
Gentle Methyl is made for people who prefer a measured dose of methylated B vitamins over the megadose formulas that dominate the market
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
