Bryan Johnson Claims 85% Reduction In Microplastics From His Semen, Here’s How He Did

Longevity enthusiast Bryan Johnson says he cut 85% of microplastics from his semen through lifestyle changes and detox steps. Find out how he did and why it matters for reproductive health.

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Written By: Muskan Gupta | Published : October 30, 2025 5:01 PM IST

Bryan Johnson is an entrepreneur and tech investor who self-identifies as a longevity enthusiast. He owns a business known as Blueprint and spends a significant amount of money monitoring his health data, nutrition, and testing treatments. Johnson reportedly stated that his semen microplastic particle count had dropped by around 85 per cent in a time span of about eight months

Bryan Johnson Eliminated 85% of Microplastics Fom His Semen

Bryan Johnson had decreased his concentration of microplastic particles in his semen to roughly 20 particles per millilitre, as compared to when the concentration of the microplastic particles in his semen was approximately 165 particles per millilitre. He explains this outcome by the combination of lifestyle modifications, reduced exposure to environmental elements and certain biohacks.

https://twitter.com/bryan_johnson/status/1980693126391218482

What Are Microplastics?

Microplastics refer to small pieces of plastic (usually less than 5 mm in diameter) which are ubiquitous in food, water, and air, as well as in the human body. They have been detected in human blood, semen, tissues and breast milk. Although all its effects remain to be completely studied, initial research points to potential relationships with inflammation, hormonal imbalance and reproductive influences.

How Bryan Johnson Reportedly Did It?

The principal tactics which, according to Johnson, were used are as follows:

Saunas and Groin Cooling

According to Johnson, he would receive a 200 F dry sauna daily for about 20 minutes and simultaneously put ice packs over his groin area to prevent heat damage to his testes. In his opinion, it is this combination that contributed to the reduction of microplastics.

However, high testicular heat has been known to harm the well-being of sperm, even though saunas may facilitate detoxification through the process of sweating. The given method of groin cooling is not a well-researched one.

Reducing Plastic Exposure

He stopped warming food in plastic bags, had dropped using plastic cutting boards and had switched to a reverse osmosis water-filtration system. The activities minimise the ingestion and drainage of plastic components/chemicals.

Testing and Tracking

Johnson monitored levels by use of microplastic tests (through a finger-prick blood test that his company sells) and semen tests. Measurement and tracking are things that he focuses on as part of the protocol.

Tips to Avoid Using Plastics

You will probably not copy the entire program used by Johnson, but the following are accessible and science-backed habits to pay attention to:

  1. Always use glass or stainless-steel containers rather than plastic containers, particularly in the heat treatment of food.
  2. Do not microwave in plastic or use really mangled plastic boards/pans.
  3. Use filtered water (drink high-grade filter/reverse osmosis filter) as much as possible.
  4. Wear favourable dresses and other materials, fabricated out of natural fibres as opposed to synthetic plastics.
  5. Healthy sleep, well-balanced nutrition with high levels of antioxidants, physical activity, limited tobacco use, and alcohol use, all for the benefit of reproductive and general health.

At present, taking the practical steps to minimise exposure to plastic appears to be a rather reasonable decision, although we might wait for stronger scientific evidence about the long-term advantages.