I can't hear you very well http://redtube.in.net/ red tub However, it's too soon to know whether the results apply to humans. For one, the mice that lived longer had blood levels of metformin that were 10 times higher than those seen in humans taking the drug to treat diabetes, the researchers said. And mice put on an even higher dose of metformin actually had a decreased life span, because the drug was toxic (it caused kidney failure). Mice were also fed a controlled diet for their whole life, which is not true of people, said study researcher Rafael de Cabo, a senior investigator at the National Institute on Aging.