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This is especially true when the vitamin status is poor during the pregnancy and if the early-introduced foods fed to the still-breastfeeding infant are vegan

HIGH-ABSORPTION SUBLINGUAL FORMULA Organic vitamin B12 supplement absorbs up to 98% for faster, more effective results than capsules or tablets designed for rapid bioavailability

A comparative review noted that the specific polymorphisms that might, in theory, favor one form are generally not reported in commercial genetic tests, and no randomized trial has validated genotype-guided form selection in healthy people

A more recent nested case-control study within the Nurses Health Study II reported a positive association between plasma concentrations of vitamin B 12 and breast cancer risk