"Calm Child" Anyone have experience with this?

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First off, I do plan on discussing this with my sons doctor before trying it, but I wanted to see if anyone here has any experience or information on it that might be worth adding to the discussion. I have a 9 year old son who has Autism. He's on the Ritalin patch, and it has done wonders for his behavior, but it's not great. He still has some issues. His dad sent me a link for an herbal product called "Calm Child" which is supposed to help, and i'm looking into it, but I was wondering if anyone has any experience with it, and what kind of a reaction there was.