After being encouraged for 2.5 years that Neumune was in the competitive range, on March 9, 2007, the RFP was canceled by HHS.
5-Androstenediol, a steroid androgen which is an endogenous precursor for testosterone
Patrick Arnold holds a 1999 patent on "Use of 4-androstenediol to increase testosterone levels in humans".
4-Androstenediol, a steroid androgen which acts as a prodrug to testosterone