Melatonin ELISA kits are assays designed to detect the hormone melatonin, which is secreted by the pineal gland. It regulates circadian rhythm mainly through activation of melatonin receptors. It can act as an antioxidant and a stimulant of immune reactions. It is used as a medication for insomnia, to alter sleep cycles, and to overcome jet lag. Decreased levels of melatonin have been associated with depression, while melatonin suppression has been associated with a higher risk of infertility and certain cancers. Visit the supplier page for more information about detection target, range, origin and reactivity.