Bryan Johnson's 2026 Sperm Results Are In — Scrotal Cooling Delivers 411 Million Motile Sperm

What Bryan Johnson Discovered About Sauna and Fertility

Bryan Johnson — the tech entrepreneur behind the Blueprint anti-aging protocol — has been one of the most vocal advocates for testicular cooling during sauna sessions. In May 2026, he published his most dramatic results yet.

Johnson has been using sauna sessions as part of his longevity protocol for years. But he noticed something alarming: his fertility markers were tanking after unprotected sauna exposure. So he started experimenting with scrotal cooling — applying ice packs to his testicles during sauna sessions — and tracking the results with the same obsessive precision he applies to everything.

The Numbers: With vs. Without Scrotal Cooling

Johnson's self-experimentation produced a stark contrast:

For context, the WHO threshold for natural fertility is approximately 39 million total motile sperm. Johnson's peak of 411 million puts him at more than 10× the minimum — and in the 99.6th percentile for men of all ages, including those under 25.

The Science Behind Scrotal Cooling

This isn't just biohacker n=1 experimentation. The science is well-established:

• Optimal sperm production occurs at 34°C (about 3-4°C below core body temperature). This is why testicles are located outside the body.
• Sauna temperatures range from 70-100°C, raising scrotal temperature well above the fertility-safe zone within minutes.
• The Garolla 2013 study (Journal of Human Reproductive Sciences) found that men who used saunas twice weekly for 3 months had significantly impaired sperm parameters — effects that reversed only after discontinuing sauna use.
• A 2025 review in the European Journal of Endocrinology confirmed that chronic heat exposure negatively impacts testosterone production in addition to sperm quality.

The biological mechanism is straightforward: heat damages spermatogenesis (sperm production) at the cellular level. Sperm cells are produced through a process that takes approximately 72 days, which is why damage from heat exposure can persist for months.

Bryan Johnson's Microplastics Discovery

In addition to the fertility results, Johnson reported an unexpected finding: an 85% reduction in microplastics found in his ejaculate and blood following his sauna protocol with testicular cooling. He even claimed to have achieved a complete reduction to zero microplastics in his semen — though he acknowledges that controlled clinical trials are needed to confirm causality.

While the microplastics angle requires more research, it adds another dimension to the case for sauna use with proper protection.

The Problem with Johnson's Approach

Here's the thing about Bryan Johnson's scrotal cooling method: he essentially uses a makeshift ice pack setup. It works, but it's not elegant, it's not comfortable, and it's not designed for the specific anatomy of the male groin area.

Most men who try to replicate Johnson's protocol end up using one of these DIY methods:

• Regular ice packs held in place with towels (awkward, messy)
• Frozen peas wrapped in cloth (not reusable, not sanitary)
• Generic gel packs (wrong shape, don't stay in place)

None of these solutions are designed for the sauna. They're improvised workarounds.

How IcedBallz Solves This

IcedBallz was designed specifically to solve this exact problem — comfortable, anatomically shaped scrotal cooling for sauna use:

• Anatomically shaped ice pack that fits the body naturally — no DIY workarounds
• Premium cotton underwear with a built-in pocket to hold the ice pack securely
• 45-60 minutes of cooling — enough for even the longest sauna sessions
• Reusable forever — freeze, use, refreeze. Hundreds of cycles
• One size fits all — no guessing about sizing
• $69 one-time — a fraction of what fertility treatments cost

Why This Matters for Every Sauna User

You don't need to be Bryan Johnson to care about this. If you use a sauna regularly — even once a week — you're exposing your testicles to temperatures that science has repeatedly shown are harmful to fertility and hormone production.

The question isn't whether scrotal cooling works. Bryan Johnson's 2026 results, combined with decades of research, have answered that definitively. The question is: what's the most convenient way to do it?

For most men, the answer is IcedBallz — because it's designed for this exact use case, it's comfortable, and it costs less than a month of gym membership.

Key Takeaways

1. Bryan Johnson's May 2026 sperm results are his best ever — 411M motile sperm, 99.6th percentile — achieved with scrotal cooling during sauna
2. Without cooling, sauna use caused a 56% drop in total motile sperm and 50% drop in motility
3. With cooling, motility increased by 57% and concentration reached 212M/mL
4. The science is settled: sauna heat damages sperm production. Cooling protects it.
5. IcedBallz makes it easy: $69, anatomically shaped, 45-60 min cooling, designed for sauna use