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A consultation is especially important if you: Have a known allergy to B vitamins or any of the MIC components Are pregnant, breastfeeding, or trying to conceive Have kidney disease, liver disease, or a history of kidney stones (methionine metabolism can affect uric acid and homocysteine levels) Take blood thinners, immunosuppressants, or medications that interact with B12 absorption (such as metformin) Have a sulfa allergy (methionine is a sulfur-containing amino acid) Have a trimethylaminuria (fish-odor syndrome) diagnosis, which affects choline metabolism Have a history of cardiovascular events or uncontrolled hypertension This list is not exhaustive, and it is not a substitute for an individualized assessment

Deficiency In healthy adults, overt vitamin B 12 deficiency is uncommon, mainly because total body stores can exceed 2,500 g, daily turnover is slow, and dietary intake of only 2.4 g/day is sufficient to maintain adequate vitamin B 12 status (see The RDA) (4)

2 This is to compensate for the relatively high amount of Vitamin A that is secreted into breast milk

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