Bryan Johnson· Author
Levels approaching 100 ng/mL can carry potential benefits. Beyond that is not ideal.
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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.
Levels approaching 100 ng/mL can carry potential benefits. Beyond that is not ideal.
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The threshold of toxicity sits around 150 ng/mL
The other thing that came back high was my vitamin D levels. So I've been hovering around like 40 50 range for the past couple years. It's been stubbornly there. And no matter how much vitamin D I take, I just cannot move it. And so it over the past 90 days, it shot up to 134. So over a 100 is getting to be excessively high.