Vitamin E is one of the first oral agents used for the treatment of PD. However, there is no convincing evidence that alone or in combination with other agents it is of any significant benefit. Its use advocated by generations of urologists without any real understanding of the medical literature. Recently, in older men and men with heart disease, vitamin E has been shown to worsened cardiac health. It is likely that vitamin E is a placebo and has not real benefit.
Stem cell research is a hot topic at the moment and it is only a matter of time before it will be used for PD. There are no studies ongoing at this time.