Microplastics Everywhere: How Bryan Johnson Cut His Blood Levels by 93%
Microplastics are in water, food, clothing and even IV bags, and the science on their harm is still emerging rather than settled. Bryan Johnson reports a 93% drop in the microplastic particles found in his blood after a year of measurement and simple swaps. The episode's core message: start with measurement, then apply an 80/20 approach at home instead of chasing perfection.
Overview
A French study made headlines by finding five to fifty times more microplastic particles in glass-bottled drinks than in their plastic or canned equivalents, and the team unpacks why the culprit turned out to be paint flakes from the metal crown caps rather than the glass itself. Dr. Mike Mallin explains what microplastics actually are, how they enter the body mostly through ingestion, and why the human evidence remains correlative rather than causal. The conversation separates two different problems that often get merged: mechanical particles lodging in tissue, and endocrine-disrupting chemicals leaching from heated or eaten-from plastic.
The team also shares their own test of a typical IV drip, which contained roughly 40,000 microplastic particles compared with about 3,300 a year from two litres of glass-bottled water daily. Mallin points to an under-discussed source: washing machines and synthetic clothing shedding fibres into the water system. Bryan Johnson walks through his own result, one particle in a blood sample and a 93% reduction, placing him below all but 1.6% of nearly 3,000 tests.
The likely contributors include reverse-osmosis filtered water, stainless steel storage, natural-fibre clothing, HEPA vacuuming, avoiding canned food and plastic tea bags, blood donation, and above all regular sauna, which produced dramatic drops in other industrial toxin markers. Kate Tolo keeps returning to the optimistic frame: these unsettling headlines exist only because demand for measurement has grown. The episode closes with the wider argument that microplastics are a commons problem, like air pollution, that no individual can solve alone.
Key quotes
5Our grandparents are full of lead, our parents are full of asbestos, and we are full of microplastics.
It's everywhere. It's in our drinking water. It's in our food. But nobody's really talking about where they're coming from.
Isn't it cool that it's actually measurement that leads us down this path?
It really begins with measurement. Science begins with counting.
You're not going to completely eliminate plastic from your life, so just do your best when you can.
Key ideas
9Glass bottles were never the safe haven
A French study found five to fifty times more microplastic particles in glass-bottled cola, lemonade, iced tea and beer than in plastic or canned versions. The glass itself is fine; the particles come from paint flakes on the metal crown caps.
A cleaning step changed everything
Untreated crown caps shed around 287 particles per litre. A simple air blast plus alcohol rinse cut that to 87, showing the problem is a manufacturing process, not the material.
What microplastics actually are
They are nanometre to micron scale plastic fragments that mostly enter through ingestion, sometimes inhalation. They circulate in blood and deposit in tissues, and have been detected across organs from arteries to the brain.
The evidence is emerging, not settled
There is no definitive human data proving these particles cause harm. Signals exist in animal studies and epidemiology, but the relationships remain correlative, which is why alarm is not the right response.
Particles and chemicals are two different problems
Microplastics act mainly as mechanical disruption of tissue. Endocrine-disrupting chemicals are a separate route, leaching out when plastic is heated or eaten from, as with canned soup or a microwaved container.
The IV drip result
A typical vitamin or NAD drip tested at roughly 40,000 microplastic particles. For context, drinking two litres of glass-bottled water a day amounts to about 3,300 particles a year.
Washing machines are a hidden source
One of the largest environmental sources at this particle size is laundry, as synthetic clothing sheds fibres into the water system. The lever is wearing and washing less plastic, not just filtering what you drink.
A 93% drop, and why it is hard to attribute
Bryan Johnson's blood sample came back with a single microplastic particle, down 93% and lower than all but 1.6% of nearly 3,000 tests. Because many changes ran in parallel, no single intervention can claim the result.
Sauna was the standout for toxin reduction
Across the interventions tried, regular sauna produced the most dramatic drops in industrial toxin markers, including a 65% fall in one and a 100% fall in another. The protocol described is a dry sauna at about 200°F for 20 minutes daily.
Practical takeaways
7- 1
Filter at home, carry stainless steel 22:10
Standard pitcher filters do not remove microplastics; reverse osmosis systems do, and entry-level units start in the low hundreds. Fill a stainless steel bottle at home rather than buying drinks on the go.
- 2
Rethink the kitchen basics 23:00
Swap plastic cutting boards for wood, avoid reheating food in plastic containers, skip non-stick cookware, and store food in food-grade stainless steel or ceramic.
- 3
Skip canned foods and plastic tea bags 23:40
A week of canned soup raised BPA levels roughly twentyfold compared with fresh soup in published studies, and mesh plastic tea bags release thousands of particles into hot water. Choose fresh food and paper tea bags.
- 4
Dress in natural fibres 24:00
Cotton, bamboo, hemp and wool shed no plastic in the wash, while polyester workout wear does. Cleaning out the wardrobe reduces both personal and environmental exposure.
- 5
Clean the air you live in 25:10
Vacuum with a HEPA filter to trap settled particles and upgrade the filter in your home ventilation system, staying within the rating the system is designed for.
- 6
Donating blood is a free, shared benefit 20:40
Giving blood has been shown to reduce plasma particles, costs nothing and helps someone else. It compares favourably to expensive plasma-exchange procedures whose own materials may reintroduce plastic.
- 7
Measure a baseline before chasing protocols 30:20
An at-home finger-prick blood spot test can quantify microplastic levels across three particle sizes. Use a metal lancet, as a plastic one contaminates the sample and skews the reading.
Topics & chapters
15A generational materials crisis
Lead, then asbestos, now microplastics. The episode opens with the promise of both bad news and a 93% reduction story.
The French glass bottle study
Five to fifty times more particles in glass-bottled drinks than plastic or cans, and why it tipped people over the edge.
Crown caps and a simple fix
Paint flakes on metal caps are the source, and a cleaning step cuts particles from 287 to 87 per litre.
What microplastics are and how they get in
Size, route of entry, and where they have been detected across human tissues.
Reading the evidence honestly
Why animal data and epidemiological signals are concerning but not proof of causation in humans.
Particles versus endocrine disruptors
Separating mechanical tissue disruption from chemicals that leach out of heated plastic.
Where they actually come from
Washing machines and synthetic clothing as one of the largest and least discussed sources.
Testing an IV drip
Roughly 40,000 particles in a single drip, and how that compares to a year of bottled water.
Measurement as the starting point
The argument that awareness of numbers is what makes systemic change possible.
Bryan's 93% result
One particle in a blood sample, and the honest uncertainty about which intervention deserves credit.
Plasma exchange versus blood donation
Why plasma exchange may reintroduce plastic, and why donating blood is the simpler option.
Water at home and on the road
Reverse osmosis, stainless steel bottles, and the awkward reality of airports and travel.
Kitchen, clothing and air swaps
Cans, cutting boards, tea bags, natural fibres, HEPA vacuuming and ventilation filters.
Sauna as the top performer
Dramatic drops in industrial toxin markers after repeated sessions, and the daily protocol used.
Testing, next experiments and closing
The finger-prick test, the metal lancet caveat, upcoming semen and sweat testing, and a hopeful sign-off.