Peter Attia· MD
when I finished residency my I don't I didn't measure free testosterone I only knew my total testosterone but it was 220 that was on a scale where 2 standard deviations below the mean was 350 yeah 2 standard deviations above the mean was 1,200 and I'm 220 yeah out of my hip replace when I was 49 that's where that's when I got on it yeah 49