Forskolin is a chemical found in the roots of the plant Plectranthus barbatus (Coleus forskohliiIndian Coleus). Forskolin has a very wide range of therapeutic applications. Forskolin in combination with rolipram inhibits colon cancer cell growth. It is also a very good vasodilator. It is used as a bodybuilding supplement. It increases the tanning response of the skin when applied topically.