Vitamin D and autism, what's new?

Area of Science:

• Neuroscience
• Endocrinology
• Developmental Pediatrics

Background:

• Vitamin D deficiency (25(OH)D < 40 ng/ml) during gestation and early childhood is increasingly implicated in autism spectrum disorder (ASD).
• Vitamin D acts as a neurosteroid crucial for brain development, influencing gene regulation, cellular processes, and neurotransmission.

Purpose of the Study:

• To evaluate the efficacy of vitamin D supplementation in treating core autism symptoms.
• To assess the potential of vitamin D in preventing autism in high-risk populations.

Main Methods:

• Review of open-label trials and a randomized controlled trial (RCT) investigating high-dose vitamin D (300 IU/kg/day, max 5000 IU/day) for autism treatment.
• Analysis of a small study on vitamin D supplementation (5000 IU/day pregnancy, 1000 IU/day infancy/childhood) for autism prevention in families with a history of ASD.

Main Results:

• Open-label trials and an RCT demonstrated significant improvement in core autism symptoms in approximately 75% of children receiving high-dose vitamin D.
• Preventive supplementation reduced autism incidence from 20% to 5% in a high-risk cohort.
• Vitamin D supplementation achieved recommended blood levels (25(OH)D) without significant toxicity.

Conclusions:

• High-dose vitamin D supplementation is a potentially effective treatment for core autism symptoms.
• Vitamin D supplementation during pregnancy and early childhood may significantly reduce autism incidence.
• Practitioners should consider vitamin D treatment for autism and preventive supplementation, monitoring 25(OH)D levels.