N-acetylcystein (NAC), a specific antioxidant supplement, may be effective in easing irritability and repetitive behaviors in children with autism. The antioxidant effects and the modulation to the glutametergic system, are 2 mechanisms believed to be responsible for NACs effects in autism.

Biol Psychiatry 2012:71:956-961

Over the past 10 years, NaturoMedic.com has been using NAC effectively for autism.