From a tree native to Polynesia. It is reputed to have wondrous wound-healing properties, as well as being a cure-all for almost every skin ailment you can think of, from acne to eczema to psoriasis, but all of the miraculous claims are hinged on anecdotal, not scientific, evidence. There’s no harm in using this oil in skin care—like most oils, it is composed of phospholipids and glycolipids, and these are natural constituents of healthy skin and are good water-binding agents. Tamanu oil may have anti-inflammatory properties and there is some research showing it has anti-tumor properties, though this has not been proven in any direct research on skin.