New evidence suggests those with autism don’t have a normal
ability to produce cellular energy, which can damage cells and
impair cognitive function. L-carnitine works at the cellular
level to convert glucose to energy. In one study, 30 children
aged 2 to 8 with autism took 45 mg of L-carnitine per pound of
body weight, or a placebo. After six months, while the placebo
group had not improved, the L-carnitine group had better scores
in tests of verbal and non-verbal communication, using objects,
fear and nervousness, and interpersonal relations. Doctors said
L-carnitine was safe and significantly improved autism symptoms.