L-carnitine is used for treating primary L-carnitine deficiency, secondary L-carnitine deficiency due to inborn errors of metabolism, and L-carnitine deficiency in people requiring hemodialysis. It is also used orally for treating drug-induced L-carnitine deficiency and for treating valproate-induced toxicity. L-carnitine is also used orally for myopathies associated with zidovudine and isotretinoin, myocarditis associated with diphtheria, male infertility, Rett Syndrome, chronic stable angina pectoris, congestive heart failure (CHF), and myocardial infarction. It is also used orally as a supplement in low birth weight and preterm infants, in strict vegetarians or vegans, and in dieters. L-carnitine is also used for anorexia, chronic fatigue syndrome, diabetes, hyperlipidemia, hyperthyroidism, attention deficit-hyperactivity disorder (ADHD), peripheral vascular disease and intermittent claudication, leg ulcers, and Lyme disease.