EBO2 (EBOO) therapy, explained: how it works, what the research shows, and what clinics charge.

EBO2, also called EBOO, is a form of ozone therapy offered by some US wellness clinics. During a session, blood flows from a line in the arm through a filter, where it meets oxygen and ozone, and back through a second line.

We gather the published studies, what regulators have said, and what clinics state on their own pages, with a link to every source, so you can read it all in one place.

Where things stand

FDA status

No EBO2 device or protocol is FDA-approved to treat any condition.

What the FDA has said

The research so far

We track 6 published papers on EBOO as given to people; 4 of them describe a single patient or a small series.

The studies, annotated

Safety

Any treatment that routes blood outside the body has known risks, which studies and regulators have recorded.

Side effects and safety

Does EBO2 (EBOO) Work? The Evidence, Study by Study

Every study in our EBO2 (EBOO) library in one place: design, size, what was measured and found, its limits, and a check for any study a clinic cites.

Read the guide

What 163 clinics say on their own pages

We read the EBO2 pages of 163 of the 177 listed clinics and recorded what each states, with the exact words and the page's address; clinics whose pages we could not read are left out of these counts. The latest reading was on September 28, 2026. These are counts of statements, not findings about any clinic.

What happens in a session

A clinic places two IV lines. A machine moves blood through a filter, where it meets a mix of oxygen and ozone across a membrane, and returns it. Clinics most often say a session takes 60 to 90 minutes.

What to expect, step by step, and who should not have it.

The EBO2 (EBOO) circuit Blood leaves a vein in the arm, receives an anticoagulant, is pumped through a filter where it meets an oxygen and ozone mix across a membrane, and returns to the arm through a second line. arm 1 2 3 4
  1. Blood is drawn from a vein in the arm.
  2. An anticoagulant and a pump keep it flowing without clotting.
  3. A filter exposes the blood to an oxygen and ozone mix across a membrane.
  4. Blood returns to the arm through a second line.
Figure 1. The EBO2 circuit, simplified. The arrows on the lines show which way the blood flows.

Questions people ask first

Every guide cites its sources and names the limits of each study.

All 28 guides

How this site works

Read our editorial policy and medical review process.