melatonin, a dietary supplement, also known as N-acetyl-5-methoxytryptamine. ▪ INDICATIONS: It is used for jet lag and insomnia, for cancer protection, and as an oral contraceptive. Melatonin is effective for treating jet lag and has shown benefit when used in combination therapy for various cancers. It is not very effective for insomnia. There are insufficient data related to its efficacy for other uses. ▪ CONTRAINDICATIONS: It is not recommended during pregnancy and lactation, in children, or in those with autoimmune disease or known hypersensitivity to this product.