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Doctors issue major warning over viral limitless pill used by celebrities as brain fuel

A once-obscure medical dye called methylene blue is trending as a so-called limitless pill, boosted by celebrity anecdotes, podcast chatter and biohacking culture. While influencers tout cognitive benefits and vitality, medical experts stress that research in humans is limited and risks, including serotonin syndrome are real. The substance has legitimate FDA-approved clinical uses, but its wellness hype remains far ahead of verified science.