Bryan Johnson· Author
Immotile (IM): This term describes the proportion of sperm in the semen sample that are not moving at all. A higher percentage of immotile sperm can indicate a male fertility issue.
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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.
Immotile (IM): This term describes the proportion of sperm in the semen sample that are not moving at all. A higher percentage of immotile sperm can indicate a male fertility issue.
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