Plunge × Blueprint: Inside Bryan Johnson’s Sauna Protocol and Our New Partnership

Bryan Johnson doesn't do anything casually. The longevity pioneer who has spent years turning his own body into the world's most rigorously tracked health experiment doesn't adopt a new protocol without data. He doesn't endorse a product without testing it himself and certainly doesn't call something effective unless he can prove it. So when Bryan ran a 30-day sauna experiment—using the Plunge Sauna for daily 20-minute sessions at 200°F with full lab work before and after—and came out the other side calling it his #1 longevity protocol of 2025, we paid attention.

Today, we're announcing our partnership with Blueprint, the science-backed wellness platform Bryan built to make his protocols available to everyone. If you've been looking for a reason to take heat therapy seriously, his data is a pretty good place to start.

The World's Most Measured Human

Though he needs no introduction, Bryan Johnson is the founder of Braintree Venmo, which he sold to PayPal for $800 million, and the creator of Kernel, a company building devices to measure human brain activity at scale. Since 2021, Johnson has run Project Blueprint, a structured self-experimentation program measuring and intervening on his biological age across more than 70 biomarker systems. Publicly reported outcomes place him in the 98th percentile for muscle mass and body composition among all men and the 99th percentile for bone mineral density, fertility, and sexual function; his vascular function is consistent with that of a man in his late 20s, and his blood glucose and blood sugar control rank better than 99 percent of adults aged 18 to 25. Johnson currently ranks first on the Rejuvenation Olympics leaderboard, a tracked index of more than 5,000 participants measuring biological age metrics.

Blueprint is the platform that came out of that obsession. But it wasn't built for Bryan. It was built for everyone. The protocols are grounded in population-level research across diverse populations. Bryan's body is the testing ground, not the template. Every formulation is precision-dosed and third-party tested for toxins and heavy metals, with no unnecessary fillers. This isn't celebrity wellness or one man's biohacking experiment packaged for sale. Every ingredient fights for its life against the population-level evidence.

The Sauna Experiment: His #1 Longevity Protocol of 2025

Before Bryan integrated sauna into his protocol, he designed a study around it. Thirty days. Daily sessions at 200°F in the Plunge dry sauna. Full pre- and post-lab work to measure what actually changed. 

The results were the opposite of subtle.

After just 15 sessions, his urine toxin panel was the cleanest he'd ever recorded. Several previously elevated exposures dropped to undetectable levels. By the end of the experiment, his data showed an 85% reduction in microplastics across blood and ejaculate samples, 100% elimination of several environmental toxins including MEP and Perchlorate, and measurable improvements in vascular health equivalent to undoing roughly a decade of arterial aging.

His conclusion: "Sauna is one of the most efficacious longevity protocols I've ever done. It can improve your heart, metabolism, skin, and brain health."

More recently, Bryan has been pushing the envelope even further, with longer sessions designed to cross the heat shock protein threshold—the point at which core body temperature reaches 102.4°F and triggers a deeper cellular response. He calls it saunamaxxing, and the data is still coming in. But the direction of the evidence is clear: the ceiling on what heat therapy can do is higher than most people think.

Why The Plunge Sauna

Not all saunas are built for this kind of protocol. Bryan's experiment required a dry sauna capable of reaching and holding high temperatures consistently. The Plunge Sauna is built from premium, all-natural cedar with no off-gassing, which matters when you're sweating for 20 minutes a day and trying to reduce your toxic load rather than add to it. It reaches temperatures up to 230°F using a HUUM stone heater, and comes equipped with a WiFi-enabled app that lets you preheat remotely, track your sessions, and dial in your protocol with precision. (You can even follow Bryan’s exact protocol within the Plunge App.)

In Bryan's words: “Dry sauna sessions at high temperatures (≈80-100 °C) and longer sessions (>19 min) have the strongest and longest-running evidence for lowering resting blood pressure, improving arterial elasticity and, over decades, cutting cardiovascular and all-cause mortality. This is what makes dry sauna unique, and very likely superior to wet (steam bath) and infrared saunas.”

What We're Building Together

The partnership with Blueprint is a natural extension of what both brands are trying to do: make the highest-evidence health protocols accessible to people who are serious about their health and want tools that actually work.

As part of the partnership, Plunge customers now have access to Blueprint's recovery supplement line, formulated to work alongside heat sessions and support the cellular repair, muscle recovery, and longevity benefits that the sauna initiates. Heat breaks the body down. Blueprint's supplements—including the Recovery Stack and Recovery Duo—are designed to build it back up.

Get Started

Blueprint's Recovery Stack and Recovery Duo are available now. Use code PLUNGEVIP for 20% off your first Blueprint order—exclusively for Plunge customers.

And if you don't have a Plunge Sauna yet, Bryan's results are a reasonable argument for changing that.

*Offer is limited to new Blueprint customers only. Discount not valid on the 302 Laser Diode Cap. Discount valid for one purchase, per person. Cannot be combined with other offers or promotion.