Bests & Worsts Reviews from Amazon

Unfortunately, the test results of this product by an independent laboratory called Consumer Labs showed high levels of unhydrolyzed quercetin which suggests a low quality ginkgo extract spiked with flavenols from another source. The company refuted this, but admits that the Chinese company that supplies the ginkgo extract is modifying it's process to start meeting USP requirements. I offered to give my unopened bottle back to Dr's Best but they did not want it. Also sad to say it's been more than a month since I bought this unopened bottle (I threw away my opened bottle). So I give it a negative review and will buy a better brand from now on.