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Contraceptive pills can also cause a deficiency, this is thought to be related to a reduction in the vitamin B12- carrying protein (transcobalamin)
Sixteen percent of the women whod suffered recurrent foetal loss carried two copies of the MTHFR gene that causes abnormally high homocysteine levels, and three of the women had overt B12 deficiency
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Journal of Investigative Dermatology, Volume 113, Issue 3, 1999, Pages 364-368
Neelakantan H, Vance V, Wetzel MD, et al
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