If you have looked into blood detox treatments, you have probably run into EBOO, short for Extracorporeal Blood Oxygenation and Ozonation. It is marketed heavily as a blood filtration or blood cleansing therapy, often with a photo of a cup full of frothy material presented as the toxins it supposedly pulled out of you.
Before I take it apart, I want to be clear about something. The people who look into EBOO are usually not careless. Many are living with chronic, draining illness, Long COVID, Lyme, autoimmune disease, the kinds of conditions conventional medicine often handles poorly, and they are reasonably looking for something that might finally help. I have real sympathy for that. But precisely because your health and your money are on the line, it is worth understanding what this machine does, and what it does not.
I perform therapeutic plasma exchange (TPE) for a living, and extracorporeal therapies, treatments that run your blood through a machine outside the body and return it, are my area of expertise. EBOO is one of them. Of all the claims made for EBOO, the word filtration is the one that does not survive contact with the actual machine. Once you understand how the device is plumbed, the rest of the story follows. So let me walk through exactly what it is.
What EBOO actually is
The heart of an EBOO rig is a standard hollow-fiber hemodialyzer, usually a cellulose triacetate (CTA) cartridge bought off the shelf, mounted on a pole and driven by a general-purpose laboratory peristaltic pump. Blood is drawn from one arm and returned to the other.
Here is the detail that matters, and it is easy to miss. The cartridge holds thousands of tiny hollow fibers, and it has two separate spaces: the lumen, meaning the hollow inside of those fibers, and the jacket, the space around the outside of them. In ordinary hemodialysis, blood flows through the lumen while dialysate, a cleansing solution, flows through the jacket. EBOO runs the same cartridge backwards. It sends the blood through the jacket, around the outside of the fibers, and the ozone-oxygen gas down the lumen, inside them. The port that a dialyzer uses as its blood outlet is repurposed as a waste drain.
The thing to notice is what is missing: there is no dialysate anywhere in an EBOO circuit. That is not a small detail. It is the difference between a device that removes things from blood and one that does not.
Why it is not dialysis, and not filtration either
A dialyzer can pull substances out of blood by only two routes, and EBOO blocks both.
The first is diffusion, the way real dialysis works. Solutes cross the membrane down a concentration gradient into a receiving fluid, the dialysate, which carries them away to the drain. Take the dialysate away and there is no sink for anything to move into. Gas cannot stand in for it, because the molecules people worry about, urea, uric acid, heavy metals, microplastics, are not volatile and do not evaporate into an oxygen stream. So in EBOO, diffusion removes nothing.
The second is convection, also called ultrafiltration. Pressure pushes plasma water across the membrane, dragging small dissolved solutes along with it. This one does happen in EBOO, because the pump pressurizes the blood in the jacket, and a little plasma water gets forced across the membrane into the gas-filled fibers and drains out the bottom as waste. So the device does remove something. The question is what.
And the answer is set by the size of the pores, which is where the marketing collapses. A hemodialysis membrane is a fine sieve, fine enough to hold back albumin, the spec sheet for these filters literally advertises "minimal albumin loss." Albumin is a small protein, about 3.5 nanometers. So anything bigger than albumin cannot cross. That includes the red cells, of course, but it also includes everything that actually matters for detox or plasma therapy: autoantibodies, immune complexes, LDL and other lipoproteins, protein-bound heavy metals and toxins, and certainly any particle as large as a microplastic.
The only things small enough to make it through are gas, water, and the smallest dissolved solutes, electrolytes, glucose, urea, a little uric acid. So the waste is a thin, non-selective trickle of salty water carrying small molecules at the same concentration they sit at in your blood. Everything from albumin upward stays in the jacket and goes right back into you.
Sit with what that means. A real detox filter would pull the toxins out and leave the useful small molecules in. EBOO does the reverse. The fine pores that keep your cells out of the waste keep every toxin in your body, and the only thing the device discards is a little of the harmless small-molecule fraction your body actually wants. It is not failing to filter toxins by accident. It is straining out the wrong end of the spectrum.
What is actually in the waste cup
EBOO providers often photograph the collection cup, a layer of pale yellow liquid under a head of white "pancake foam," and present it as toxins, uric acid, or microplastics pulled from the blood. Neither part is what it is claimed to be.
The pale liquid is that ultrafiltrate, the plasma water squeezed across the membrane. It looks lighter than plasma for a revealing reason: plasma is yellow because of bilirubin, and bilirubin travels bound to albumin. Since the membrane holds albumin back, the bilirubin stays behind too, and the fluid that crosses comes out protein-poor and nearly colorless, further diluted by the saline used to prime the circuit. Its very paleness is proof the protein, and everything bound to it, never left the body.
The white foam is the same ultrafiltrate with gas blown through it. The ozone and oxygen running along the lumen side froth the thin, protein-poor filtrate into bubbles. It cannot be albumin, because albumin is held back on the blood side and never reaches the waste at all. It is not uric acid, a small dissolved molecule present in milligram amounts that cannot pile up as froth, and it is not microplastics, which are far too large to cross a membrane that retains albumin. It is aerated dilute filtrate, and that is the whole of it. The proof is in the assay: test that cup and it reads as dilute plasma water, not a concentrate of anything. If it did contain meaningful protein or pigment, that would point to the membrane leaking or red cells rupturing, which is a sign of harm, not of cleansing.
The clots in the filter
The waste cup is not the only prop. After a session, a provider may point to the clear cartridge itself and show you dark red strands, jelly-like mats, or stringy material clinging to the inside, and call it biofilm, heavy metals, or toxic sludge pulled from your tissues.
It is a clot. Blood is built to stay liquid inside your vessels, but the instant it meets a foreign surface the clotting cascade switches on. That is one of the most dependable reactions in all of medicine, and it is exactly why every blood circuit, including the ones I run, needs careful anticoagulation to work at all. An EBOO cartridge gives that reaction an enormous surface to seize on, thousands of fiber exteriors plus the housing wall. And because the blood is pushed through the jacket rather than the smooth fiber lumens the cartridge was built for, some of it moves slowly and pools in irregular corners. That is exactly where clots form most readily.
So those dark strands are fibrin, the protein mesh of a clot, woven through your own trapped red cells. They were not in your bloodstream before the session. They are not microclots being filtered out of you, which is the specific claim you will sometimes hear, they are clots the circuit formed from blood that was perfectly liquid when it left your arm and would have stayed that way inside you. Nothing was drawn out of your tissues. The machine took your blood, clotted it against its plastic, caught the clot on its walls, and showed you the clot as proof of detox. It is evidence that the device clots blood, which is a hazard in itself, not that it cleaned anything. It is also why the circuit cannot run without blood thinners, a problem I return to below.
What the ozone actually does
If the membrane is not removing toxins, the real mechanism is whatever the ozone does, and ozone is a powerful oxidizing agent. The original EBOO research recorded a four to five fold rise in markers of lipid peroxidation after a session, along with a drop in plasma protein thiols, the sulfur-containing chemical groups that do much of that protective work. Supporters frame this as hormesis, a small stress that prompts the body to strengthen its defenses.
Consider the cost of that trade. Albumin carries the largest share of your plasma's antioxidant capacity, scavenging free radicals and offering a sacrificial thiol group that shields other molecules. This is literally a protective mechanism. Ozone consumes those thiols. The measured drop in protein thiols after EBOO is direct evidence that the procedure is spending down your plasma's main antioxidant reserve. And because the membrane keeps albumin on the blood side, that oxidized, depleted albumin is not removed. It is handed back to you. This is the sharpest contrast with TPE, which removes aged, oxidized plasma and replaces it with fresh albumin that has its protective chemistry intact. On oxidative balance, the two procedures run in opposite directions.
The microplastics, mold, and bacteria claims
EBOO is often sold to people with chronic illness as a way to cleanse the blood of microplastics, environmental mold, or stubborn infections like Lyme. The size scale alone makes this impossible. Recall that the membrane holds back albumin, so its effective cutoff is around the size of albumin itself, about 3.5 nanometers. Line the targets up against that. A microplastic particle is enormous by comparison, far larger than any single protein. A typical bacterium runs on the order of 1,000 to 5,000 nanometers, and Borrelia, the Lyme spirochete, is a long coiled cell longer still. Mold spores are larger again, commonly 2,000 to 10,000 nanometers across. Every one of these is hundreds to thousands of times bigger than the pores. None of them can cross the membrane, so none of them can end up in the waste cup. They go into the jacket with the blood and come back to you with the blood.
There is a further problem with the infection version of this pitch. If you truly had live bacteria or fungi circulating in your bloodstream, that is not a wellness issue, it is a medical emergency, bacteremia or fungemia, the kind of thing that progresses to sepsis and puts people in an ICU on intravenous antibiotics or antifungals. The organisms are far too large for the membrane to filter out, and a partial, unmonitored pass through an ozone circuit is not a treatment for a bloodstream infection.
This is worth contrasting directly, because plasma exchange is being studied for the microplastics question specifically. A 2026 study in the Journal of Clinical Apheresis (Weinstein and colleagues) reported the first demonstration that TPE can lower the circulating burden of microplastics in human patients, clearest at higher starting levels, with the honest caveat that plastic tubing can shed some particles back into the circuit. The principle holds because TPE actually removes plasma and what is suspended in it. You can read more in my overview of plasma exchange and microplastics. EBOO offers no comparable mechanism and no comparable data.
The evidence, the regulators, and the safety problem
The published clinical evidence for EBOO comes almost entirely from a single Italian group, whose strongest result is a 28-patient trial in peripheral artery disease from 2005 that has never been independently replicated. That is the high-water mark in the peer-reviewed literature.
Let me be direct about the regulatory status, because it is often blurred. There is no FDA clearance for EBOO as a treatment. The FDA classifies ozone as a toxic gas with no recognized medical use. The dialyzer cartridges are cleared only for hemodialysis, and they are being used for something they were never evaluated for. The agency has acted on this, including a 2025 warning letter to a manufacturer assembling kits from off-the-shelf dialyzer filters and veterinary-grade pumps with no quality controls. An EBOO clinic is not running an approved device off-label. It is running an unapproved, unregulated assembly.
That absence of regulation shows up in the hardware, and this is the part that should concern you most. A real dialysis or apheresis machine is built around safety systems, above all an air detector that stops the pump the instant it senses a bubble. That protection matters enormously here, because EBOO deliberately drives gas into blood. Many of these rigs, a lab pump, a dialyzer, and an ozone generator on a pole, have no air or bubble detection at all. Gas in the bloodstream is an air embolism, and an air embolism can be fatal. Any of that gas that comes out of solution as bubbles in the blood being returned to you is exactly what those missing sensors exist to catch.
Anticoagulation is a second problem. The clotting described earlier is why these circuits cannot run without blood thinners, and managing that is a tightrope. Some setups under-anticoagulate and risk returning clots to the patient. Those that do it properly generally rely on systemic heparin, which carries its own real risks, including bleeding and heparin-induced thrombocytopenia. Hospital apheresis units handle this with strict monitoring protocols that an unregulated clinic is under no obligation to follow. There is no version of this that is free of hazard.
It is worth naming why the model has spread, because it is not the evidence. A dialyzer, a peristaltic pump, and an ozone generator are inexpensive, and with no FDA pathway and no mandated safety systems, there is little cost or oversight involved in offering it. A treatment that is cheap to assemble and unregulated to run is an easy thing to add to a clinic's menu, and that economics, more than any clinical case, helps explain why EBOO is now so widely available.
By contrast, therapeutic plasma exchange runs on FDA-cleared apheresis devices with built-in safety monitoring, carries guideline-categorized indications from the American Society for Apheresis, and is backed by decades of use, up to and including the AMBAR trial in Alzheimer's disease.
The bottom line
EBOO and TPE are not two versions of the same idea. Therapeutic plasma exchange separates and removes your plasma, with its antibodies, inflammatory mediators, oxidized proteins, and dissolved contents, and replaces it with fresh albumin. EBOO is a hemodialysis filter run backwards as a makeshift oxygenator, with no dialysate, that returns your cells and proteins to you while bleeding off a thin trickle of salty water, then introduces an oxidizing gas that draws down your antioxidant reserve. It is not a gentler form of filtration, because it is not filtration at all. Look at the name: Extracorporeal Blood Oxygenation and Ozonation. Filtration is not in it, and there is no filter in the circuit. The only thing EBOO does is exactly what it is named for, oxygenate and ozonate your blood, and that, the oxidizing, is the part most likely to harm you.
If you are weighing blood-based therapies, the questions to ask any provider are simple: What is the FDA status of the device? What is the actual mechanism, and what evidence supports it for my condition? A treatment that cannot answer those plainly is telling you something.
This article is general educational information and not medical advice. Decisions about any treatment should be made with a qualified physician who knows your situation.
If you have questions about therapeutic plasma exchange and whether it may be right for you, you can schedule a free consultation through Global Apheresis.