Annatto, sometimes called roucou or achiote, is derived from the seeds of the achiote trees of tropical and subtropical regions around the world. The seeds are sourced to produce a carotenoid-based yellow to orange food coloring and flavor. Its scent is described as "slightly peppery with a hint of nutmeg" and flavor as "slightly nutty, sweet and peppery".

Annatto is commonly used in Latin American and Caribbean cuisines as both a coloring and flavoring agent. Central and South American natives use the seeds to make body paint and lipstick. For this reason, the achiote is sometimes called the "lipstick tree". Achiote originated in South America and has spread in popularity to many parts of Asia. It is also grown in other tropical or subtropical regions of the world, including Central America, Africa and Asia. The heart-shaped fruit are brown or reddish brown at maturity, and are covered with short, stiff hairs. When fully mature, the fruit splits open, exposing the numerous dark red seeds. The fruit itself is not edible, however the orange-red pulp that covers the seed is used to produce a yellow to orange food coloring. Achiote dye is prepared by grinding seeds or simmering the seeds in water or oil.

Health benefits

Annatto is a rich source of tocotrienols, antioxidants that are similar in structure and function to vitamin E. The tocotrienols from annatto and other sources like palm oil and rice bran are the subject of current nutritional and medical research since these compounds are thought to prevent cancer due to their anti-angiogenic effect. The annatto seed, unlike palm oil or rice bran, does not contain any tocopherols so it is a natural source of pure tocotrienol compounds.

In developing countries, particularly in Colombia, people with low income and less access to modern medicine resources use folk medicine and natural remedies for the treatment of common infections. Achiote is also among those herbs used in Colombian folk medicine to treat infections of microbial origin. In addition to the known health benefits exerted by xanthophylls, a bioactive sesquiterpene from achiote exhibited moderate antifungal activity. Norbixin isomers found in annatto extracts are responsible for the antimicrobial activity specific for Gram positive bacteria.