He hit the button for a tub of the white, slightly sweet powder.

Elias looked at his hands. They were steady, but his muscles felt like lead. He didn't want to "biohack" his way to a miracle; he just wanted to finish a Saturday morning session without needing a four-hour nap afterward. He wanted to be able to hike with his daughter in the afternoon without his calves screaming in protest.

He clicked a link to a supplement site. The reviews were a mix of marathon runners and people managing chronic fatigue. “Like putting high-octane fuel in a car with an empty tank,” one user wrote.

He sat on a bench in the locker room, staring at his phone. He had a browser tab open to a health forum where the phrase was highlighted in a dozen different threads.

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