2X Formula 1 Shake MixOverview This 2x Formula 1 pack is a great way to ensure a long time supply of healthy meals for yourself. If you are using the shakes by yourself, 2 tubs will last you approximately 1 months (if you are on a weight loss program). Your best friend when it comes to weight loss. 1 minute preparation, low calories, high in proteins, nutrients and vitamins. The Herbalife Formula 1 shake has been the mainstay of the company and of countless successful