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In perhaps a hopeful bid to go where no old man has gone before — made biologically younger again — Star Trek star William Shatner has had tens of millions of umbilical cord stem cells injected into his 88-year-old body.

In doing so, and in sharing news of his personal “restorative” therapy with his 2.5 million Twitter followers, Shatner has become the latest celebrity to seemingly endorse a medical offering of dubious benefit, critics say.

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“Today I received restorative stem cells from my good friend Greg DiRienzo @ProGenaCell,” Shatner recently tweeted. “The stem cells were manufactured by Invitrx here in So Cal (Southern California). My friend Dr Mathi Senapathi gave the cells to me intravenously. Is it possible to turn back the clock? I will let you know.”

The tweet began with the hashtag #ad.

He got 60 million

Skeptics such as the University of Alberta’s Timothy Caulfield say there is no good evidence from human trials to support the idea that injecting stem cells has a global, anti-aging effect.