My natropathic doc put me on Progesterone for my awful awful PMS, and I've found that Smoky Mountain Naturals' is the best I've tried so far. On my most recent order, though, I accidentally ordered estrogen. Even though it was my fault, when I contacted them they replied promptly to let me know a replacement jar had been shipped. Fantastic product and above-and-beyond with the customer service. Wish more companies were so attentive to quality and customer service...the world might be a different place!