Dietary supplements and specialized diets are sometimes used by people with ADHD with the intent to mitigate some or all of the symptoms. However a 2009 article in the "Harvard Mental Health Letter" states, "Although vitamin or mineral supplements may help children diagnosed with particular deficiencies, there is no evidence that they are helpful for all children with ADHD. Furthermore, megadoses of vitamins, which can be toxic, must be avoided." In the United States, no dietary supplement has been approved for the treatment for ADHD by the FDA.