Ok, not getting any answers here other than folks saying it works. So I am doing my own research. Here's one link I found that supports the 1 person who replied so far...
YUCK
"Sellers and consumers refer to these products as “prohormones” or “andro”. They include, among other substances, Androstenedione, Androstenediol, Norandrostenedione, and Norandrostenediol.
Although prohormones have been around for some time, the demand for these products exploded in 1998 after they were found in the locker of leading baseball player, Mark McGwire. Although McGwire later claimed that he had stopped using these products and criticized their use, it was too late. A small industry multiplied overnight to satisfy an exploding demand.
According to the lawsuit, leading manufacturers sell nearly $100 million a year of these products, mostly to young adults and others who can least afford it, by making false claims that the products safely promote muscle growth. In fact, a survey conducted by researchers at the Harvard Medical School reported that 18% of male gym-goers had used these products and 56% of self-described male bodybuilders had used them within the last two years. The study’s authors speculated that 1.5 million American men could regularly be using these sports supplements.
Despite their widespread use and exorbitant cost, study after study concludes that these sports supplements don't perform as advertised. According to the lawsuit, the defendants have known for years that these supplements do not help users gain muscle mass and strength. To keep the public interested, and to continue to boost sales, sellers continuously formulate and market "new and improved" versions of these sports supplements, often ridiculing older products. As consumers become increasingly aware of the ineffective nature of one product, new products appear overnight to capitalize on users' hopes and dreams. The defendants currently include such popular brands as EAS, Weider, Met-Rx, Twinlab, Pinnacle, Muscletech, Cytodyne, GEN, GNC, AST, Klein-Becker USA, NutraSport, Prolab Nutrition, VPX, Pharmalogic, Impact Nutrition, Kaizen, Mass Quantities, Vitamin Shoppe Industries and Vitamin World."
I don't know if natural sterol complex falls into this category. What has puzzles me is that this stuff pumped me up and held the pump for days after..measureable results, not mind..why?