Endogenous agonist at orexin receptors (Ki values are 20 and 38 nM for OX1 and OX2 receptors respectively). Stimulates feeding following central administration and may be involved in the control of sleep-wake cycle and other hypothalamic functions.

左叶酸钙是亚叶酸的钙盐，在癌症化疗中用作佐剂。

Nemifitide (diTFA) is is a synthetic pentapeptide antidepressant with a potential for rapid onset of action. Nemifitide (diTFA) is a peptide analog of melanocyte-inhibiting factor (MIF).