Biogenx Basically, all they are is a set of nutrients that are VITAL for growth. The only time they occur naturally in the body is during puberty and this is because, at that time, the primary focus of the body is to get bigger (to turn you from a child to an adult). They work by Biogenx traveling in the bloodstream to areas that need growth - in particular, your penis. Once there, they attach themselves to the receptors that are already there and this stimulates the production of new cells. One puberty comes to an end, so does all of the growth - and that's why your manhood has not grown since.