The following Mark's Daily Apple article was written by Mark Sisson, and is narrated by Tina Lehman.

Testosterone supplementation, my primal take.

After I turned 60, a routine checkup showed that I had lower than normal free testosterone levels.

I hadn't noticed anything that would have alerted me, no symptoms, no indication, everything worked well.

But it nagged at me.

I knew testosterone did much more for a man's health than just build muscle, which I had no real

interest in at this point.

So I decided to explore TRT, or testosterone replacement therapy.

I did a careful survey of the literature coming away pleasantly surprised.

The evidence was almost uniformly in favor, with the well-constructed

studies showing major benefits for TRT. This is TRT, mind you, not juicing, not steroid abuse.

Restoration of biologically appropriate levels of testosterone. Thus began my experiment.

In men with low testosterone levels, restoring those levels

with TRT reduces the risk of atrial fibrillation. In diabetic men aged 50 to 70, TRT improves muscle

mass, reduces fat mass, and increases physical function. In older men with low libido, TRT increases it.

In men with diabetes, TRT increases libido and erection quality.

In older Japanese men, 12 months of TRT improved waste circumference, triglycerides,

fasting blood sugar, body fat, and HBA1C.

Stepping back to look at the big picture, TRT starts looking even better.

36 months of TRT improves quality of life and sexual function while reducing anxiety.

In studies where TRT increases T levels to the normal range, all-caused mortality drops.

Not bad, right? Most people have a knee-jerk

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