COLEUS, FORSKOLIN Dr. Jared Grantham, has identified a bizarre substance within the cysts of massively enlarged PKD kidneys. Dr. Grantham, a Distinguished Professor at the University of Kansas Medical Center, found that PKD kidneys accumulated a highly potent fatty-like substance with the capacity to stimulate growth, but it's taken more than 12 years to discover what this fatty-like chemical is~ Coleus forskohlii.