High-dose vitamin D During pregnancy Fails to Reduce Autism and ADHD risk in kids

Denmark: Researchers from the University of Copenhagen reported in their original research article that their study revealed a reduced risk of autism, a lower load of autistic symptoms, and a decreased risk of ADHD diagnosis for mothers with higher levels of 25(OH)D before starting the intervention. However, high-dose vitamin D3 supplementation during pregnancy had no impact on the risk of autism or ADHD.

This investigation is published in the American Journal of Clinical Nutrition.

During pregnancy, a deficiency of vitamin D may lead to a higher likelihood of developing autism or attention deficit hyperactivity disorder (ADHD).

This study aimed to determine the impact of vitamin D3 supplementation during pregnancy on the risk of developing autism and ADHD.

This randomized clinical trial was conducted as part of the COPSYCH project, which is nested within the COPSAC2010 cohort, a population-based sample of 700 healthy mother-child pairs (enrolled at week 24 of pregnancy). The maternal 25-hydroxy-vitamin D (25(OH)D) levels were measured, and 623 mothers were randomly assigned to receive either high-dose (2800 IU/d) or standard-dose (400 IU/d) vitamin D3 until one week after giving birth (315 received high-dose, 308 received standard-dose). When the children reached the age of 10, the diagnoses and symptom load of autism and ADHD were assessed using the Kiddie Schedule for Affective Disorders and Schizophrenia for School-Age Children-Present and Lifetime Version (K-SADS-PL).