Acetylcarnitine, also spelled as acetyl-l carniitne, may help with attention deficit hyperactivity disorder (ADHD) in children with the genetic disorder known as fragile X syndrome. Fragile X syndrome results from an inherited genetic defect on the X chromosome. It is associated with  mental retardation and may also cause autism and ADHD. Italian researchers gave acetylcarnitine supplements to boys between 6 and 13 years old for a period one year and compared them to a group who took placebo pills. Those who took acetylcarnitine had a much better outcome. See and
I have not seen any studies regarding the use of acetyl l carnitine in children with ADHD who do not have fragile X syndrome, but I think the use of an acetyl l-carnitine supplement is a safer option to  prescription stimulants and is certainly worth a try. I am not sure what the ideal dosage of acetyl carnitine for long term treatment would be in children, but a dosage of 5 to 10 mg per kilo is a reasonable one to begin with This dosage can be adjusted higher or lower as needed. For a 30 kg child, (66 pounds), this would be about 200 to 300 mg per day. Inform your child's doctor about this study and both of you can agree on an appropriate dosage.

Disclaimer: People should be taking the least amount of prescription drugs that provide adequate treatment, and to regularly monitor and review what is being taken and how much. This applies to most supplements, too. Please do not make any changes in your treatment without first discussing it with your health care provider. Statements made, or products sold through this website, have not been evaluated by the United States Food and Drug Administration. They are not intended to diagnose, treat, cure or prevent any disease.

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