Wu-Yi Source Premium Blend Natural Weight Loss Tea. Best before date: May 1st, 2011. This Organic Wu-Yi Tea Weight Loss System is specifically designed to help cleanse the body of harmful fats and disease causing free radicals while promoting healthy weight loss. The Wu-Yi Oolong Tea Weight Loss System is the total weight loss program complete with 100% all natural and organic weight loss product. Feel young and energized again with a healthy weight loss solution that works. Natural flavor. 60 count box.