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.

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

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