We've done GLP-1s and peptides. Time for the one that's personal for me: is TRT actually safe for your heart? For years the answer was "we don't really know," and the internet filled that silence with both fearmongering and cheerleading. Then we finally got real data. Here's the honest version.
Deep Dive: Is TRT safe for your heart? The real answer.
For a decade, testosterone therapy carried a cardiovascular cloud. A couple of shaky studies in the early 2010s spooked everyone, the FDA slapped on a warning label, and the question just hung there. Then came TRAVERSE, the trial built specifically to answer it. 5,204 men, ages 45 to 80, all with low testosterone and either heart disease or high risk for it. Randomized, placebo-controlled, the real deal. Here's what it found, good and bad.
The reassuring headline. Testosterone did NOT increase major adverse cardiac events. Heart attack, stroke, cardiovascular death: no significant difference versus placebo over the study. 🟢 Strong evidence. For the central fear that's haunted TRT for ten years, that's a genuinely big result.
The fine print nobody puts in the headline. Three things did show up more often on testosterone: atrial fibrillation (3.5% vs 2.4% on placebo), acute kidney injury (2.3% vs 1.5%), and pulmonary embolism (0.9% vs 0.5%). 🟢 Strong evidence. None of these are nothing. A-fib in particular is worth knowing about if you're going on TRT, because it's the kind of thing you'd want your doctor watching for, not discovering by accident.
The hematocrit surprise. TRT reliably thickens your blood, raises your hematocrit. Everyone assumed that was the mechanism that would drive clots and cardiac events. TRAVERSE found that the raised hematocrit was NOT associated with increased cardiovascular risk in the trial. 🟡 Moderate evidence. That doesn't mean ignore it, the trial capped hematocrit at 54% and monitored it constantly, but it complicates the simple "thick blood equals heart attack" story.
How they actually ran it, because this is the real lesson. Doses were titrated to keep testosterone in the 350 to 750 ng/dL range, and hematocrit was checked at 2, 4, 12, and 26 weeks, then every several months. That's the point most people miss. The safety result came from monitored testosterone therapy, not from guys running grams of gear from a website and never drawing labs. The trial isn't a green light for cowboy dosing. It's evidence that supervised, in-range TRT with regular bloodwork is reasonably safe. 🟢 Strong evidence on the protocol, that's just how the study was designed.
My read: if you're hypogonadal and considering TRT, this is the most reassuring data we've ever had, with three specific things to keep an eye on. The headline isn't "TRT is safe." It's "monitored, in-range TRT is reasonably safe, and the monitoring is not optional." The guys who get hurt are almost always the ones skipping the labs.
Not medical advice. This is exactly the conversation to have with a doctor who runs your bloodwork.
Quick Hits
The cheapest longevity test you can do at home costs nothing. Grip strength is one of the strongest predictors of all-cause mortality we have, beating systolic blood pressure in some analyses. Each 5kg drop in grip is linked to about 16% higher all-cause mortality and 17% higher cardiovascular mortality. Below roughly 26kg (57 lbs) for a man is the danger zone; healthy for 40-something men runs 40kg+. Buy a $20 hand dynamometer and track it like a vital sign. 🟢 Strong evidence
The Finnish habit that halves cardiac death. In a 2,300-man cohort, guys who used a sauna 4-7 times a week had roughly 50% lower cardiovascular mortality than once-a-week users. Two to three times a week still cut it about 24%. Sessions of 15-20 minutes. It's observational, so not bulletproof causation, but the dose-response is striking and the downside is basically zero. 🟡 Moderate evidence
If you're on TRT, blood donation might be your most underrated tool. Since testosterone raises hematocrit, regular donation is a simple way to keep it in range, and you help someone else out. Talk to your doctor about cadence, but it's the kind of cheap, boring intervention that beats fancy supplements. 🟡 Moderate evidence
My Experience
Here's the part I don't love admitting: I put off fixing this for years because I was scared of a needle. A grown man who would later cheerfully inject all sorts of things, frozen by a single doctor-prescribed shot he actually needed. The irony is not lost on me.
About ten years ago it hit me. Exhausted no matter how I slept, no drive, a fog I couldn't think through. My family doctor's take, more than once, was "that's just getting older." But low testosterone isn't a vibe, it's a measurable thing that drags down energy, mood, motivation, and focus, because those systems literally run on it. I refused to accept that my forties came with a free fog machine.
So I researched it, found TRT, and chickened out. Three separate times. I even talked to a clinic and backed out. Meanwhile I'm sitting there feeling like a shell of myself, gatekept by my own nervous system and a one-inch needle.
When I finally got proper bloodwork, my testosterone was on the floor, nowhere near where a healthy man should sit. I started a twice-a-week protocol, and the first two weeks were almost embarrassing: energy back, head clear for the first time in years. I'd stalled the better part of a decade for a fix that kicked in within fourteen days.
Eight years in, here's what I'd actually tell you. Get bloodwork often early on, not once and forget it. Find a clinic that reads your labs line by line, I've been through eight, and plenty just glance and move on. Around year five my hematocrit started creeping up, which is expected: testosterone tells your body to make more red blood cells, so the blood literally gets thicker, and that's the one TRT side effect worth genuinely respecting. I started donating a couple times a year and it evened right out (bonus: free cookies, and somebody else gets the red cells). And the fertility question that used to be a hard either/or has more options now, because TRT on its own tells your body to stop making its own supply, so ask about that before you assume anything.
No regrets. I'd never go back. I just wish I'd started before the needle won three rounds.
My protocol, my body, my doctors. Not a template.
Next issue (Friday): the quiet stuff that wrecks your recovery. What a nightcap and a late-night meal are really doing to your sleep and your numbers. A subscriber asked for this one, and I'm taking more requests: just reply and tell me what you want me to dig into.
The 40+ Protocol is educational content, not medical advice. I'm a game designer reporting studies and my own n=1 experiments, not a doctor. Talk to yours before changing anything. No affiliate links in this issue.