Twinlab has taken out the MaHuang (ephedra) from our thermogenic diet formula for all those dieters who prefer not to take this ingredient. Metabolift MaHuang Free has an herbal blend of natural metabolic boosters, formulated to help your body utilize fat for needed energy (when used as directed as part of a calorie controlled diet and exercise program). So not only do you slim down, but also you enjoy an increase in vitality. This natural, thermogenic diet formula is a fast-acting combination of Guarana Seed Extract (a natural form of caffeine), Chromium Picolinate and L-Phenylalanine. It supports increased metabolism, which is important to weight loss.