The evidence is mounting that vitamin D deficiency is a risk factor for autism. For example, there are generally excess birth rates for
autism around March in the northern hemisphere,a time when sunlight is diminished. Some researchers have found that autistic children had much lower vitamin D levels than healthy children. Some studies suggest that maternal vitamin D deficiency is a risk factor for autism in the offspring.
Pregnant women looking to avoid autistic offspring are well advised to take at least 4,000 IU/day of vitamin D3 or more and raise serum 25(OH)D levels above 40 ng/ml based on a randomized controlled trial with pregnant and nursing women in South Carolina. This study found beneficial effects during pregnancy and no adverse effects associated with 4000 IU/d vitamin D3.1
One study in Australia found that maternal vitamin D deficiency during pregnancy was significantly correlated with language impairment in the offspring.
Vitamin D Council: Excerpted from a blog posted on March 20, 2013 by Dr William Grant. By William Grant and John Cannell.
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