Quercetin & Piperine - Well we've got our pretty sick post cycle therapy stack going here, but there poses one small problem, and that's absorption and bioavailability. Icariin and Resveratrol do not have the greatest bioavailablity in all the land so we gave them a little help with Quercetin and Piperine. Quercetin is used because it is the most potent natural inbitor of estrone sulfanase which degrades compounds like resveratrol. This makes aids in absorption. Piperine is another addition because it enhances the ability of your intestines to absorb nutrients and phytochemicals. Additionally, piperine may also inhibit the glucuronidase enzyme, another enzyme which degrades resveratrol.