Do Testosterone Boosters Actually Work?

Hormone boosters are a huge market, from testosterone products to growth hormone peptides and injectable HGH. The pitch is always the same: swallow or inject this and your hormones climb. So do they actually work? Andrew Huberman has spent hours on the science of testosterone and growth hormone, and his answers are more useful, and more cautious, than any label.

This post gathers the concrete claims Huberman and Joe Rogan made about growth hormone and testosterone on the record, with the timestamp for each clip so you can hear the source. Hormones are powerful and individual, and none of this is medical advice, so talk to your doctor before touching any booster, peptide, or injection.

Start with the good news, because some boosters genuinely move the numbers. Huberman points to a sauna protocol of two hours a day that produced a 16-fold increase in growth hormone on the first day. Exercise works too: about 60 minutes of resistance or endurance training can raise growth hormone 300 to 500 percent, both right away and the following night.

Even a plain amino acid can do it. Huberman says arginine, taken by mouth or vein, can boost growth hormone 400 to 600 percent above baseline. On paper these are enormous swings, far bigger than most bottled supplements claim, which is exactly why the next part matters so much.

The catch is that your body adapts. Huberman notes that the giant sauna effect shrank dramatically with repetition, dropping to roughly a 3 to 4 fold increase by the third day. The same happens with arginine: more than about 9 grams actually blunts the effect rather than adding to it, and combining arginine with exercise does not stack, so growth hormone stays clamped around 300 to 500 percent instead of piling up.

Food matters just as much as dose. High blood glucose or insulin blunts growth hormone release, according to Huberman, which is why he says a sugary sports drink during exercise immediately flatlined growth hormone in studies, and why he prefers doing sauna fasted. The lesson is that a booster is not a switch you can hold down. Push too hard, or eat at the wrong time, and the response collapses.

If you want one lever that reliably raises growth hormone, Huberman keeps returning to sleep. The largest pulse of growth hormone occurs roughly between 10 p.m. and 2 a.m., released in the early part of the night during deep slow-wave sleep. That timing is the whole point of an early bedtime.

Miss the window and you cannot buy it back. Huberman cites sleep researcher Gina Poe's finding that going to bed later than usual makes you miss the first-cycle bolus of growth hormone entirely, because your circadian clock has already moved on. Testosterone follows a related logic on the training side: Huberman explains that testosterone release is driven by both intensity and volume of exercise, while growth hormone is driven mainly by intensity.

This is where the honest answer turns sharp. Huberman does not just theorize about peptides, he has used them and backed away. He says sermorelin spiked his PSA, a prostate marker, so he stopped it immediately, and in another episode he explains he took sermorelin on and off for a couple of years but quit because it deepened his early-night sleep while depleting his REM sleep.

The bigger concerns are structural. Huberman warns that augmenting growth hormone, directly or through peptides, increases tumor and cancer risk because growth hormone and IGF-1 are indiscriminate about which tissues they grow, and that too-high growth hormone enlarges everything including the heart, lungs, liver, and spleen. He also notes that injecting growth hormone triggers negative feedback that can shut down your own natural release, that one growth hormone peptide, CJC-1295, had a death in a clinical trial tied to cardiovascular dysfunction, and that ghrelin-based peptides increase hunger and somewhat increase anxiety.

Some boosters are famous for the wrong reasons. Huberman points out that androstenedione was the purported performance-enhancing drug at the center of the 1990s and 2000s Major League Baseball scandals, a reminder that hormone shortcuts have a long and messy sporting history.

Pharmaceutical growth hormone has its own legend. On his podcast, Joe Rogan recounted the claim that Lionel Messi was supplied pharmaceutical growth hormone as a child to avoid remaining very short, eventually reaching about five feet seven. That is a medical use under supervision for a diagnosed condition, which is a different universe from an adult buying a booster to feel younger.

Does a booster even fill a real gap? Huberman says growth hormone release drops by roughly 15 percent per decade after about age 30, and that nightly output can fall two to three fold between 30 and 40. The striking part is his claim that exercise and sleep habits can fully offset that decline, which puts a lot of the natural boosting back in your own hands.

There is one more wrinkle that should make anyone humble about hormone products. Huberman describes a placebo study in which, after two days of a real drug, a saline injection alone raised growth hormone and lowered cortisol, even when subjects were told it would do the opposite. Belief itself moved the hormone. Between that, the tolerance effects, and the risks of the strong stuff, the honest verdict is that the boosters that reliably work are mostly the free ones.

Does exercise increase testosterone and growth hormone?

According to Andrew Huberman, yes. He says testosterone release is driven by both the intensity and volume of exercise, while growth hormone is driven mainly by intensity, and about 60 minutes of training can raise growth hormone 300 to 500 percent immediately and again the following night.

Are growth hormone peptides like sermorelin safe?

Huberman treats them with caution and has used them himself with mixed results. He says sermorelin spiked his PSA so he stopped it, and warns that boosting growth hormone raises tumor and cancer risk because growth hormone and IGF-1 grow tissue indiscriminately. This is a conversation for a doctor, not a purchase decision.

What is the best free way to raise growth hormone?

Huberman keeps pointing to sleep and exercise. The largest growth hormone pulse comes in early deep sleep between roughly 10 p.m. and 2 a.m., and he says consistent exercise and sleep can fully offset the age-related decline, no injection required.

So do testosterone and HGH boosters actually work? The recorded answer from Huberman is nuanced: sauna, exercise, arginine, and above all sleep can genuinely spike growth hormone, but the body adapts fast and the strongest injectable boosters carry risks he personally chose to avoid. If there is a takeaway, it is that the reliable boosters are the ones that cost nothing, and the powerful ones belong in a doctor's hands. Talk to yours before you start anything on this list.