Advanced Ultra-Concentrated Anabolic Formula Mass and Density Enhancer Increase Peak Performance What It Is Designed for serious training programs, Natural Sterol Complex contains a comprehensive formulation of the most powerful anabolic sterols, phytonutrients, EFAs, mass and density enhancers and much more. Who We Are Universal Nutrition has been providing cutting edge and staple nutritional supplements to bodybuilders and hard training athletes the world over since 1977. As time passes, certain ideals never go out of style. Honesty. Integrity. Respect. These are the values we uphold and are the bedrock upon which we built our business.