How Does Jelqing Work?
The theory behind jelqing is that blood is forced into the penile tissue and the resulting pressure forces them to expand beyond their normal limits. When this happens, it stimulates the production of proteins that serve to build-up the tissue. In a way, this would explain why vacuum pumping doesn’t build tissue. For the growth factor chemicals to work they need to be circulated. When the penis is erect there is very little circulation of blood. Because jelqing is performed when the penis is merely tumescent, there should be an increased blood flow to the tissues affected. Is this theory valid? Who knows. Science has yet to seriously explore how jelqing affects the biomechanics of tissue growth.