Bryan Johnson· Author
While the body can tolerate brief CO₂ shifts in free diving or breathing exercises, that reflects adaptation, not benefit.
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The headline is broadly defensible, but the qualifications matter. Effect sizes vary by population, the strongest claims rest on shorter trials, and credible voices push back on how it's typically framed.
While the body can tolerate brief CO₂ shifts in free diving or breathing exercises, that reflects adaptation, not benefit.
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