Originally Posted by mrsD

These complex biological entities are very difficult to handle, and prove worth.

http://www.ncbi.nlm.nih.gov/pubmed/1...&ordinalpos=17

For example, how would doctors control this factor, select out only one effect when it has many?

When one sees these research articles it can give false hopes. Even when something is on a fast track it can take 10 yrs or longer before coming to the patients. Right now there is huge controversy over treatment of Parkinson's disease, since nothing new is being offered them, even with all the research coming out. It is very frustrating all around, and I understand your question, and don't have an answer for you.

You can click on PubMed at the top right of the page here, and type in Neurotropin-3 to search and see what I mean. The research papers are listed there.