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For those with subclinical lows
Have a negative impact on unborn children : A study published in Pediatric Perinatal Epidemiology found that extremely high plasma folate and vitamin B12 levels in pregnant women were associated with risk of autism spectrum disorder
Patients with Leber's hereditary optic neuropathy should avoid cyanocobalamin (hydroxocobalamin is preferred in the UK)
Trends in Endocrinology and Metabolism (2017) 8
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