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Sulforaphane treatment of autism spectrum disorder (ASD)

Kanwaljit Singh, Susan L Connors, Eric A Macklin, Kirby D Smith, Jed W Fahey, Paul Talalay, Andrew W Zimmerman
Proceedings of the National Academy of Sciences of the United States of America 2014 111(43):15550-15555

Bibliography

PubMed
PMID 25313065
PubMed Central
PMC4217462
Funding
Supported by gifts from the Nancy Lurie Marks Family Foundation, Hussman Foundation, Lewis B. and Dorothy Cullman Foundation, Agnes Gund Foundation, N of One Foundation, and Brassica Foundation for Chemoprotection Research.
Competing interests
Johns Hopkins University filed U.S. patent applications with inventors K.D. Smith, Paul Talalay and Andrew W. Zimmerman; Talalay and Zimmerman divested potential financial benefits. Johns Hopkins licensed glucosinolate-rich broccoli sprouts/seeds to Brassica Protection Products LLC, whose CEO was Talalay's son. The tested sulforaphane-rich extract itself was not a commercial product.

Study snapshot

DesignRandomized double-blind placebo-controlled clinical trial
ModelMales aged 13-27 years with moderate to severe autism spectrum disorder
Sample44 participants (29 sulforaphane, 15 placebo)
InterventionBroccoli-sprout-derived sulforaphane 50-150 µmol daily versus placebo.
Duration18 weeks treatment plus 4-week washout
EndpointsAberrant Behavior Checklist (ABC); Social Responsiveness Scale (SRS); Clinical Global Impression-Improvement (CGI-I); Post-withdrawal change

What the study showed, in plain terms

This small randomized trial tested broccoli-sprout-derived sulforaphane for 18 weeks in adolescent and young adult males with moderate to severe autism spectrum disorder.

Key findings

Compared with placebo, the sulforaphane group improved on ABC and SRS scores and showed more CGI-I improvement in several domains. After treatment stopped, scores moved back toward pretreatment values.

What this study can and cannot tell us

The sample was small, exclusively male and limited to ages 13-27. Behavioral outcomes included caregiver and clinician ratings, and the findings required replication in larger and broader populations.

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