Thought this was interesting seven time more powerful than resveratrol.. Not sure if it can be translated the same for human use.
Recently (2008), in an experience presented in a program of Portuguese television (RTP - ABciência - elixir da imortalidade), it was demonstrated, for the first time, that it is possible to immortalize yeast cells thanks to the effect of a vegetable extract. The plant biomolecules protect the cells in fatal conditions of oxidative and thermal stresses. This vegetable extract is seven times more powerful than resveratrol in the extension of the yeast chronological lifespan.
http://en.wikipedia..../Life_extension