Biohacker Bryan Johnson asserts he has significantly reduced the toxic microplastics in his body in under a year.

The 48-year-old, who claims his biological age is over a decade younger, shared on X that between November 2024 and July 2025, he decreased microplastics in his semen from 165 to 20 particles per milliliter, marking an impressive 88% reduction.

Similarly, he reported an 85% drop in microplastics present in his blood, seeing numbers fall from 70 particles per milliliter in October 2024 to just 10 by May 2025.

Microplastics, minuscule particles smaller than sand grains, leach into the bloodstream from everyday items like food containers, water bottles, children’s toys, and even face masks, a staple during the COVID pandemic. These particles can accumulate in vital organs such as the brain and heart, potentially leading to inflammation, infertility, and certain cancer types.

It’s a nearly universal issue, as virtually everyone harbors microplastics in their bodies, with estimates suggesting the average person consumes around 50,000 particles annually.

Though research is ongoing to pinpoint specific sources, experts recommend reducing exposure by avoiding plastic food containers, opting out of non-stick cookware, and considering a switch from toilet paper to bidets.

Johnson claims using a sauna every day for 20 minutes helped him sweat microplastics out of his body, as well as cutting out plastic microwavable containers and plastic cutting boards.

He also touted a reverse osmosis water system, a device that uses a high-pressure pump to force water through a barrier with extremely small pores that allows water to pass through but traps harmful contaminants. 

Biohacker Bryan Johnson, pictured here, claims he eliminated 85 percent of the microplastics in his body

However, the evidence surrounding the devices, which cost upwards of $600, is limited. 

Johnson wrote on X: ‘To our knowledge, this is the first report of any correlation (esp in the same person over two timepoints) between blood and semen microplastic levels, demonstrating successful microplastic detoxification in the semen following that in the blood.

‘My results offer a new sense of hope for the detoxification of microplastics from the testis and semen, especially after the concerns raised by a study last year.’ 

The study in question, published last May in the journal Toxicological Sciences, looked at microplastic levels in 23 testes from deceased men, as well as testicular tissue from deceased dogs. 

All of those tested showed detectable levels of 12 types of microplastics, which the researchers warned could lead to low sperm count and infertility. 

A recent meta-analysis of 36 studies, for example, found that microplastics induce oxidative stress in the male reproductive organs, leading to testicular inflammation, cell death, and reduced testosterone levels, sperm production and motility, which is how well sperm moves to fertilize an egg. 

Johnson said: ‘Microplastics in the testis and semen can disrupt sperm motility, hormones and fertility markers. The good news [is] this seems all reversible based on my results.’

Johnson claimed he uses a sauna set at 200 degrees Fahrenheit (93 degrees Celsius) for 20 minutes each day and then he puts ice on his testicles.

Pictured above are the levels of microplastics in Johnson’s blood and semen from October 2024 until July 2025

Nearly all Americans have been exposed to microplastics, which seep into vital organs and cause untold damage (stock image)

‘The therapy we think most responsible for this reduction is sauna as it also eliminated most environmental toxins in my body, including those linked to various plastics,’ he said. 

Saunas induce intense sweating, a process that may help filter chemicals found in microplastics, such as BPA and phthalates, out of the body. However, the relationship between saunas specifically and microplastics has not been studied. 

Icing the testicles after is thought to help protect against sperm damage caused by the intense heat. 

As for plastic kitchen tools, a study published in February found eating out of plastic containers regularly led to a 13 percent increased risk of developing heart failure due to microplastics damaging heart tissues. 

It’s unclear how exactly Johnson tested his microplastic blood and semen levels and if he has sustained that progress.