Steroids are widely distributed in the biosphere of a large class of cyclopentylated polyhydrogenated phenanthrene derivatives. It include cholesterol, rumen sterols, sitosterol, stigmasterol, ergosterol, bile acids and bile alcohols.

The hormones form include adrenocorticotropic hormone, androgen, estrogen, insect ecdysone, Cardiac glycosides and saponins and toad poison, etc.

In addition, there are synthetic steroids such as antiinflammatory agents (hydrogenated prednisone, dexamethasone), steroid drugs that promote protein synthesis, and oral contraceptives.

Steroid compounds are free of bound fatty acids and are non-saponified lipids. These compounds are areoprenoid and are produced by triterpene cyclization and by molecular internal recombination and chemical modification.

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