"I wanted to go from good to great, and to get a bigger dick," he told Gizmodo. "I'm not going to lie, that's why guys without erectile dysfunction would do this."
"The point I want to make, not only with [the penis] experiment but with everything I do, is that I am constantly exploring cutting-edge, high-tech health solutions to optimize my body, mind and spirit," he elaborated on a recent Facebook post.
Greenfield had US Stem Cell take body fat cells and isolated the stem cells, ready for injection. The resulting stem cells were then injected into his shaft.
Stem cells have been effectively used to treat erectile dysfunction in men, however their effects on size, length and girth have never been tested, until now.
So, after all of the effort, did it work?
"I haven't taken out a ruler… [but] when inside of my wife, she can tell" he said. Greenfield went on to explain that he was "noticeably better hung."
While the procedure is relatively low risk, it’s still not approved, and the benefits when it comes to enhancing penis size are not verified.