Cromwell,
have a look at Novogen (NRT)... I believe the prospects there are better and the downside protection is alot greater.
They have a proven anti-ageing cream they is likely to be a blockbuster cosmetic. Close to finishing clinical trials and subsequent commercialisation deal.
With PTD, watch for developments with patents. I believe the "easy" money has been made with the latest run from 70c to $2.
Good luck,
Munch.