Prolozone is an injection-based therapy that combines ozone gas with a mix of nutrients and a local anesthetic, delivered directly into painful or damaged joints. Developed by Dr. Frank Shallenberger, it blends principles from three older treatments: neural therapy, prolotherapy, and ozone therapy. The goal is to reduce pain and improve function in joints affected by degeneration, injury, or chronic inflammation.
What Goes Into a Prolozone Injection
A prolozone injection isn’t a single substance. It’s a cocktail that typically includes procaine (a local anesthetic), B vitamins like methylcobalamin, folic acid, and pyridoxine, along with magnesium, niacin, anti-inflammatory compounds, and finally a mixture of ozone and oxygen gas. The procaine numbs the area and, according to proponents, helps restore normal electrical signaling across cell membranes. The vitamins and minerals are included because they play roles in how cells use oxygen, and damaged tissues may be deficient in them.
The ozone/oxygen gas is injected last, after the nutrient mixture has been delivered. Shallenberger’s reasoning was that ozone improves how tissues utilize oxygen, and the added nutrients give cells the raw materials to take advantage of that boost. Some practitioners also include homeopathic anti-inflammatory preparations in the mix.
How Ozone Works at the Cellular Level
Ozone doesn’t act directly on tissues for very long. It reacts almost instantly with fatty acids and antioxidants in the body, producing secondary molecules (mainly hydrogen peroxide and certain lipid byproducts) that serve as chemical messengers. These messengers trigger a chain of cellular responses.
One key response involves activating a protein called Nrf2, which turns on the body’s antioxidant defense system. This ramps up production of protective enzymes that help cells cope with oxidative stress and use oxygen more efficiently. Research on blood cells treated with ozone has shown measurable increases in their maximum oxygen consumption rate and their reserve capacity, meaning cells could handle greater energy demands after treatment. The idea behind prolozone is that this improved oxygen metabolism helps damaged joint tissue heal.
Conditions Typically Treated
Prolozone is used primarily for musculoskeletal pain. The most common targets include osteoarthritis (especially in the knee and shoulder), degenerative disc disease, chronic lower back pain, tendon injuries from overuse, and fibromyalgia. Practitioners also use it for general joint degeneration and soft tissue injuries that haven’t responded well to conventional treatments.
Knee osteoarthritis is by far the most studied application. Intra-articular ozone-oxygen injections for the knee and shoulder have shown relevance in both acute and chronic joint pain in clinical trials, though the overall body of evidence remains limited compared to mainstream orthopedic treatments.
What a Treatment Course Looks Like
A typical prolozone protocol involves 3 to 6 sessions spaced about 4 to 6 weeks apart. In some clinical trials, sessions were scheduled at shorter intervals of about 10 days. The number of sessions you need depends on the severity of the condition and how your body responds to the initial injections. Some people report improvement after the first or second session, while others need the full course before noticing meaningful changes.
The injections themselves are relatively quick. The procaine provides local numbing, so most patients tolerate the procedure without significant discomfort. Soreness at the injection site for a day or two afterward is common.
How It Compares to Traditional Prolotherapy
Traditional prolotherapy uses a concentrated sugar solution (hypertonic dextrose) to provoke a mild inflammatory response, which theoretically stimulates the body’s healing process. Prolozone replaces or supplements this with ozone gas and the nutrient mixture described above.
A randomized clinical trial comparing the two approaches in 80 patients with mild to moderate knee osteoarthritis found that both worked equally well. Pain scores dropped from around 7.6-8.1 (on a 10-point scale) before treatment to about 2.8-3.0 three months after injections. Functional scores improved significantly in both groups as well. The difference between the two treatments was not statistically significant, suggesting that for knee osteoarthritis at least, prolozone and dextrose prolotherapy produce comparable results.
The practical difference patients often notice is that prolozone tends to cause less post-injection soreness than dextrose prolotherapy. Traditional prolotherapy deliberately triggers inflammation, which can mean several days of increased pain before improvement begins. Prolozone, with its anti-inflammatory components and anesthetic, generally produces a milder immediate reaction.
What the Evidence Actually Shows
The clinical evidence for prolozone is still in early stages. Several small trials, particularly for knee osteoarthritis, show meaningful reductions in pain and improvements in joint function. But most of these studies are small, and large-scale, long-term trials are lacking. The underlying science of medical ozone has stronger footing: ozone’s effects on cellular oxygen metabolism and antioxidant pathways are well documented in laboratory and blood cell studies. The gap is in translating those cellular findings into proven clinical outcomes for joint disease specifically.
It’s also worth noting that many prolozone practitioners report high success rates in their clinical experience, but practitioner-reported outcomes without controlled comparison groups carry inherent bias. The treatment shows promise, but “promising” and “proven” are different categories.
Regulatory Status in the United States
Medical ozone occupies a complicated regulatory space. The FDA has not approved ozone as a treatment for any medical condition. Ozone-generating devices marketed for therapeutic use have been flagged by the FDA as adulterated and misbranded when they lack proper premarket approval. As recently as July 2025, the FDA issued a warning letter to a company selling ozone devices, ordering them to cease distribution.
This doesn’t mean prolozone is illegal to administer. Physicians can use treatments off-label within the scope of their medical license. Prolozone is offered primarily by practitioners of integrative, naturopathic, or functional medicine. It is not typically covered by insurance, and costs generally run a few hundred dollars per session depending on the joint being treated and the practitioner’s location.