Imagine Viagra with a boost – that is what you may get in the future with chemical called tetrahydrobiopterin (BH4). This is the chemical in your body that helps nitric oxide relax blood vessels (a process that is supported by Viagra and similar drugs).
This line of research opens up a whole new field for treating ED, and is very promising. I’ve found one study (see THIS LINK for the PubMed citation) in which BH4 was studied in a small group of patients with good results, as reported in The Asian Journal of Andrology.
It is possible that BH4 deficiencies are what is causing ED in the first place. Lower levels of BH4 are seen in such conditions as diabetes, which is also associated with ED and other vascular (blood vessel) disorders.