Ozone injections are a form of medical ozone therapy in which a mixture of oxygen and ozone gas is delivered into or around a specific area of the body to reduce pain, inflammation, or disc volume. The practice is used most commonly for joint pain, herniated discs, and soft tissue injuries, though it remains controversial. The FDA has not approved ozone for any medical application, and insurance rarely covers it, but a growing number of clinics offer it as an alternative or complementary treatment.
How Ozone Injections Work
Medical ozone is created by passing pure oxygen through an electrical charge, converting some of the oxygen (O₂) into ozone (O₃). This unstable third oxygen atom is highly reactive, and that reactivity is the basis of the therapy. When injected into tissue, ozone interacts with cells and fluids in ways that are thought to stimulate the body’s own anti-inflammatory and healing responses, including the release of natural antioxidants and improved local oxygen supply.
For herniated discs specifically, the mechanism is more direct. Ozone injected into the disc causes dehydration and chemical breakdown of the gel-like center (the nucleus pulposus), which shrinks the disc and reduces pressure on nearby nerves. This process is sometimes called chemonucleolysis. A trial published in The Spine Journal compared intradiscal ozone injections to surgical microdiscectomy for lumbar disc herniations and found the injection approach was not inferior to surgery for pain relief from nerve compression.
What Ozone Injections Treat
The most common targets are musculoskeletal conditions. Infiltrated ozone at clinical concentrations is used for arthritis, tendonitis, nerve inflammation, and soft tissue pain syndromes. Knee osteoarthritis has received the most research attention. In a double-blinded, placebo-controlled study published in PLOS ONE, patients who received intra-articular ozone injections into the knee showed statistically significant improvements in pain scores, joint stiffness, and physical function compared to placebo after eight weeks of treatment.
Beyond joints and discs, some practitioners use ozone therapy for chronic wounds, infections, and broader inflammatory conditions, though the evidence base for these uses is considerably thinner.
Types of Ozone Therapy
Ozone injections are one form within a broader category that includes three main approaches: topical, infiltrative, and systemic.
- Infiltrative (injections): Ozone gas is injected directly into a joint, around a tendon, into a disc, or into the tissue surrounding a painful area. This is what most people mean by “ozone injections.”
- Topical: Ozone is applied to the skin’s surface using sealed bags, ozonated water, or ozonated oils. This takes advantage of ozone’s germ-killing properties and is used mainly for wounds and skin conditions.
- Systemic (autohemotherapy): A quantity of blood is drawn, mixed with ozone in a closed circuit so the gas dissolves and reacts within seconds, then reinfused into the body. A second systemic route involves rectal insufflation, where ozone gas is administered through the rectum and reacts with the mucous lining.
For pain conditions, infiltrative injections are the most common choice. Systemic methods like autohemotherapy are used by practitioners treating broader inflammatory or immune-related conditions.
What a Session Looks Like
A typical ozone injection session lasts between 15 and 45 minutes, depending on the method and the area being treated. For joint injections, the experience is similar to a cortisone shot: the skin is cleaned, a needle is inserted into or near the joint, and the ozone-oxygen mixture is delivered. Some patients feel a sensation of pressure or mild discomfort as the gas enters the tissue.
Treatment schedules vary by condition. Acute problems like a recent injury or flare-up typically call for two to three sessions per week over two to four weeks. Chronic conditions such as long-standing osteoarthritis usually involve one to two sessions per week over a longer course of four to eight weeks. Your practitioner will adjust this based on your response.
Risks and Side Effects
The most serious risk of ozone therapy is air embolism, where gas bubbles enter a vein or artery during intravenous administration. This can block blood flow and potentially cause a stroke or heart attack. This risk applies primarily to systemic (IV) ozone therapy rather than localized joint injections, but it underscores the importance of proper technique.
Localized injections can cause temporary pain, swelling, or bruising at the injection site. Rectal insufflation sometimes produces cramping and discomfort. The single most dangerous scenario involves inhaling ozone, which can cause severe and permanent lung damage even in small amounts. This is a particular concern with at-home or self-administered ozone, where accidental inhalation is more likely.
Certain people should avoid ozone therapy entirely. It is contraindicated in pregnancy, in people with a genetic enzyme deficiency called G6PD deficiency (also associated with a condition called favism), in uncontrolled hyperthyroidism, and in people with significant respiratory conditions.
FDA Regulatory Status
The FDA’s position is unambiguous: it classifies ozone as “a toxic gas with no known useful medical application in specific, adjunctive, or preventive therapy.” Federal regulations state that any device generating ozone for use in a medical condition “for which there is no proof of safety and effectiveness” may be considered adulterated or misbranded. The FDA also notes that for ozone to work as a germicide, it would need to be present at concentrations far higher than what humans can safely tolerate.
This doesn’t mean ozone injections are illegal. Practitioners in the U.S. can offer them, and several states have laws protecting the practice. But the lack of FDA approval means there is no standardized protocol, no required training, and no federal oversight of how the therapy is delivered. The quality and safety of treatment depends heavily on the individual practitioner and clinic.
Cost and Insurance Coverage
Because ozone therapy lacks FDA approval, insurance almost never covers it. It is a cash-only expense. Prices in the U.S. range widely, from about $250 for a single session to $6,000 for multi-session packages. A single-pass IV autohemotherapy session might cost around $250, while a more intensive 10-pass session can run $750. Packages of multiple 10-pass sessions range from roughly $2,000 to $6,000 depending on the number of treatments.
For joint injections, individual sessions tend to fall at the lower end of that range, but costs add up quickly across a multi-week treatment course. When comparing clinics, ask specifically what’s included in the quoted price: the ozone generation, the injection itself, any imaging guidance, and follow-up visits.
What the Evidence Actually Shows
The evidence for ozone injections is mixed but growing. For knee osteoarthritis, randomized controlled trials show meaningful improvements in pain and function compared to placebo. For herniated discs, at least one non-inferiority trial suggests ozone injections can produce results comparable to surgery in selected patients. These are encouraging findings, but the total body of research is still relatively small, and many studies have limitations in size or design.
For other conditions, including chronic fatigue, immune disorders, and infections, the evidence is largely anecdotal or limited to small, uncontrolled studies. The gap between what some clinics claim ozone can do and what rigorous trials have demonstrated remains substantial.