Historically synthetic testosterone was created from the yam plant after discovering the hormonal structure of the yam plant was virtually identical to human testosterone. However, conclusive scientific data shows that the natural steroid Diosgenins of smilax attach to androgen receptors over 300% more efficiently than the yam, meaning more androgen receptors are occupied, thus allowing for much faster protein turnover. In addition to Hydroxylation, 17 Hydroxy-Mesterone has had two sugar molecules cleaved off to greatly reduce the production of Aromatase, which is the enzyme that converts testosterone into estrogen. If estrogen levels increase, hard lines disappear leaving a swollen bloated physique. As a result, 17 Hydroxy-Mesterone not only gets you extremely big... it also gets you extremely shredded as well!