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Coleus forskohlii

Proposed Uses: Allergies; Asthma; Bladder Infections (pain relief); Eczema; Glaucoma; Hypertension; Irritable Bowel Syndrome (Spastic Colon); Menstrual Cramps; Weight Loss; Psoriasis

A member of the mint family, Coleus forskohlii grows wild on the mountain slopes of Nepal, India, and Thailand. In traditional Asian systems of medicine, it was used for a variety of purposes, including treating skin rashes, asthma, bronchitis, insomnia, epilepsy, and angina.  

Research has found that the rootstock of Coleus forskohlii could lower blood pressure and decrease muscle spasms. Intensive study identified a substance named forskolin that appeared to be responsible for much of this effect.

Forskolin increases the levels of a fundamental natural compound known as cyclic AMP.1,2 Cyclic AMP plays a major role in many cellular functions, and some drugs that affect it relax the muscles around the bronchial tubes found to help those with asthma.

The scientific evidence for the herb Coleus forskohlii as a treatment for any disease is weak. What is known relates to the substance forskolin rather than the whole herb.
Preliminary controlled studies have found that oral forskolin may be beneficial for treatment of asthma.  Forskolin may work by stabilizing the cells that release histamine and other inflammatory compounds. as well as by relaxing smooth muscle tissue.

Based on these apparent effects forskolin, Coleus forskohlii has been suggested as a useful treatment for asthma, eczema, and other allergic conditions, dysmenorrhea angina, irritable bowel syndrome, crampy bladder pain, and hypertension. However, there is no direct evidence that it works.

A double-blind study indicates that a concentrated forskolin extract might increase the rate of "fat burning," thereby potentially enhancing weight loss.  In addition, forskolin eyedrops have shown promise in improving glaucoma.  Coleus forskohlii has also been proposed as a treatment for psoriasis, because that disease appears to be at least partly related to low levels of cyclic AMP in skin cells.

Dosage
A common dosage recommendation is 50 mg 2 or 3 times a day of an extract standardized to contain 18% forskolin. However, because such an extract provides significant levels of forskolin, a drug with wide-ranging properties, we recommend that Coleus forskohlii extracts be taken only with a doctor's supervision.

Safety Issues
The safety of Coleus forskohlii has not been fully evaluated, although few significant risks have been noted in studies performed thus far. Caution should be exercised when combining this herb with blood-pressure medications and "blood thinners."  Safety in young children, pregnant or nursing women, or those with severe liver or kidney disease has not been established.

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