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Damiana leaf, also known as Tumera diffusa, is part of the species Turneraceae, which is composed mainly of tropical shrubs. Some of its common names include Mexican holly and oreganillo. Tumera diffusa is ordinarily found growing in warm climates such as those found in Central and South America, Mexico and the Caribbean. Our current supplier for these fantastic herbs is in Mexico. The shrub also produces small yellow fragrant flowers during the summer months. The leaves contain up to 1% volatile oil consisting of 1,8-cineole, p-cymene, alpha- and beta-pinene, thymol, alpha-copaene, and calamene among other chemicals. The dry matter of the leaf includes a characteristic brown, bitter substance called damianin as well as tannins, flavonoids, beta-sitosterol, and the glycosides gonzalitosin, arbutin, and tetraphyllin B.