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Vitamin D supplementation improves symptoms of autism

In the first placebo-controlled study to measure the effects of vitamin D supplements on autism symptoms, 85 boys and 24 girls, age 3 to 10, took a placebo or up to 5,000 IU of vitamin D3 per day. Doctors defined normal vitamin D levels at or above 30 ng/ml; and deficiency below 20 ng/ml.

After four months, vitamin D levels had increased from 26 to 46 ng/ml in the vitamin D group, and from 27 to 28 ng/ml for placebo. Autism symptom scores decreased 17.7 percent for those taking vitamin D and 1.9 percent for placebo. The vitamin D group also improved in social responsiveness compared to placebo.

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