I have researched the Corydalis Extract and the Phenibut Free Acid and they have exceeded my expectations in purity and quality. Liftmode's stellar reputation in the industry is well merited! Liftmode's customer service is what has impressed me most, apart from the quality of the products themselves. I've dealt with many of Liftmode's customer service representatives and they have all been professional and courteous. They have not disappointed me in resolving issues during any of my communications, particularly when I needed to process a return. In fact, they go above and beyond to make things right. Thank you LiftMode! I am pleased to have this opportunity give my feedback!