Andrew Huberman's Sauna Fertility Tips: How to Protect Your Sperm

In Episode 108 of the Huberman Lab podcast, Dr. Andrew Huberman does something unusual for a health influencer: he tells his audience to stop doing something they like. Specifically, he tells men who want to conceive to stop using saunas, or, failing that, to sit in the sauna with a cooling pack between their legs.

The advice sounds eccentric. It isn't. The underlying science is some of the most well-replicated work in reproductive medicine. But Huberman's recommendation also glosses over a practical problem that the research has documented clearly, one that matters if you actually want the cooling strategy to work.

The Advice, Verbatim

Huberman's primary recommendation is blunt:

For men unwilling to give up their sauna routine entirely, he offers a workaround: use a cooling pack during the session to keep scrotal temperature down while the rest of the body heats up.

The 90-day window isn't arbitrary. Spermatogenesis (the full production cycle of a sperm cell) takes approximately 60–74 days. Huberman rounds up to 90 to build in a safety margin, which is sensible. Any heat damage you're doing today affects the sperm you'd be using two to three months from now.

Where the Science Backs Him Up

Huberman is right that heat measurably impairs sperm. The landmark study here is Garolla et al. (2013), published in Human Reproduction, which tracked 10 men through three months of twice-weekly Finnish sauna use.[1] The researchers found "strong impairment" of sperm count and motility (p < 0.001), along with significant drops in mitochondrial function and DNA packaging quality. All parameters returned to baseline within six months of stopping.

He's also right that the risk extends well beyond saunas. Hot tubs, heated car seats, laptops used on the lap, prolonged sitting in tight clothing. The literature documents fertility impacts from all of these. A 2022 meta-analysis covering over 6,500 men confirmed that heat exposure degrades essentially every sperm parameter.[3]

For a deeper look at the full body of research — including occupational studies, laptop heat data, and cooling trial results — see our comprehensive guide to heat and male fertility.

And the cooling suggestion has support too. A University of Toronto study published in Fertility and Sterility Reports in 2021 found that scrotal cooling devices improved sperm motility (25.4% → 29.0%) and vitality (64.8% → 71.7%) in men with abnormal semen parameters.[2] An earlier study from 2005 showed that nocturnal cooling significantly improved sperm concentration and total count in men with oligozoospermia after 8–12 weeks.

So the framework is solid: heat hurts, cooling helps, the effects are reversible.

The Part He Doesn't Address

Here's where Huberman's advice runs into reality. He suggests "using a cooling pack" as though the hard part is knowing you should do it. In practice, the hard part is doing it consistently, and the research shows most men don't.

That same 2021 University of Toronto study found that 76.9% of participants used their cooling devices less than recommended.[2] Nearly a third found them uncomfortable. A fifth said they got in the way of daily activities. And 14.3% said the devices simply didn't stay cool long enough to matter.

This is a critical gap. Huberman presents cooling as a solved problem: grab an ice pack and go. But grabbing a generic gel pack and sitting on it in a 90°C sauna is a recipe for giving up after two sessions. The pack melts in minutes. It's awkward to position. It doesn't contour to the body. And there's the very reasonable concern about whether the materials in a cheap gel pack are safe when heated to extreme temperatures.

The science on cooling works in the lab because the lab controls compliance. In real life, compliance is the bottleneck.

The Sauna Trade-Off Is Real

This is where it gets complicated, and why Huberman's advice resonates. Saunas have real health benefits. The case for regular use is strong and getting stronger.

A 20-year Finnish study tracking over 2,300 men found that those who used the sauna 4–7 times per week had a 40% lower risk of all-cause mortality compared to once-a-week users.[3] The cardiovascular benefits, the recovery effects, the mental health upside. This is epidemiology, not wellness content.

So the question for men who sauna regularly and are thinking about fertility isn't "should I stop?" It's "can I keep the benefits while protecting against the downside?" That's the real value of Huberman's cooling suggestion: a way to avoid choosing between two things that both matter.

Making It Actually Work

If you're going to follow Huberman's advice, the details matter. A cooling solution for sauna use needs to hold temperature for the duration of a 15–20 minute session in extreme heat. It needs to be shaped to sit comfortably against the body without constant adjustment. The materials need to be non-toxic at high temperatures. Not all gel packs are designed for environments above room temperature, let alone 80–90°C.

And it needs to be easy enough to use that you'll actually do it every time, not just the first two times you're feeling motivated. The compliance data is clear on this point: if it's a hassle, people stop. The intervention only works if the experience doesn't get in the way.

Start by freezing the pack well in advance — at least two hours before your session, ideally overnight. When you enter the sauna, place it before you sit down so it's already in position. The goal isn't to make yourself uncomfortably cold; it's to keep scrotal temperature within the 33–35°C range where spermatogenesis functions normally, even while ambient temperature climbs to 80–90°C.

Material matters more than most people realize. Standard pharmacy gel packs are designed to soothe a sprained ankle at room temperature, not to maintain cooling capacity in extreme heat. Phase-change materials — the kind used in industrial cooling applications — hold their temperature significantly longer because they absorb heat at a fixed point rather than warming gradually. This is the difference between a pack that works for five minutes and one that lasts an entire session.

Consistency trumps intensity. A moderate cooling pack used every session will do more for your sperm parameters than an aggressive ice pack used twice and then abandoned because it was uncomfortable. The research consistently shows that duration of the intervention — weeks and months of regular use — drives the results, not the degree of cooling in any single session.

The Bottom Line

Huberman gets the fundamentals right. Heat damages sperm. Cooling can protect against it. The effects are reversible if you act within a reasonable timeframe. His 90-day recommendation for men trying to conceive is well-calibrated to the biology.

Where the advice needs supplementing is on execution. "Use a cooling pack" is easy to say on a podcast. Making it work in a real sauna, session after session, requires a purpose-built solution, not a Ziploc bag of ice. The science is only as good as the follow-through.