Ecdysterone supplements are sweeping the fitness world by storm, and if you look at the potential health benefits, it's easy to see why. The supporters of ecdysterone claim that it's a 'natural steroid' that boosts muscle growth with none of the side effects of man-made anabolic steroids. Every so often, a new class of supplements come along that surpasses all expectations, and phytoecdysteroids appear to be one of them.