Stem cell therapy uses cells that can develop into other cell types. The goal is to reduce inflammation or support the body’s natural repair process. Doctors inject or infuse these cells into a joint, the bloodstream, or another part of the body. Clinics use the terms “stem cell treatment” and “stem cell therapy” to mean the same thing. Although the idea has been around for years, the evidence remains unsettled for most treatments offered by US clinics today.
This page covers how stem cell therapy works, the types of cells involved, the conditions clinics target, and the current regulatory landscape. It does not claim that these treatments work, heal, or cure. Instead, it looks at their status, cost, and supporting evidence, with links to more detailed guides on each topic.
What stem cells actually are
Stem cells are unspecialized cells that can copy themselves and turn into more specialized cells. That ability is why researchers study them for repair. Not every stem cell can become every tissue.
Two traits matter for any therapy claim. First, potency: how many cell types the stem cell can become. Second, source: where the cells come from, which changes both cost and risk.
The cells used in clinics are usually adult stem cells, not embryonic ones. Adult stem cells are limited in what they can become. That limit is important when a clinic implies one injection can rebuild a joint.
The main cell types used
Clinics use two broad groups of cells, distinct from platelet-rich plasma (PRP), and the label on the brochure often hides which one you are getting.
Mesenchymal stem cells (MSCs) are the type most clinics market for joints and pain. They come from bone marrow, fat, or donated umbilical cord tissue. Research focuses on their anti-inflammatory signals more than true tissue regrowth. Our MSC explainer covers this in depth.
Hematopoietic (blood-forming) stem cells are the type behind FDA-approved bone marrow and cord blood transplants for blood cancers. These are a separate, well-established use and are not what a pain clinic sells.
Autologous vs donor (allogeneic) cells
The bigger split is where the cells come from.
| Feature | Autologous (your own) | Donor / allogeneic (umbilical, amniotic) |
|---|---|---|
| Source | Your bone marrow or fat, same day | Donated cord or amniotic tissue |
| Immune rejection risk | Very low | Low but present |
| Infection/contamination risk | Lower | Higher; depends on processing |
| Living cell content | Variable | Often low; some products have few live cells |
| Typical marketing | “Uses your own cells” | “Young, potent cells” |
The FDA warns that many umbilical or amniotic products sold as “stem cell injections” contain no live stem cells, only cellular debris, proteins, or growth factors. A confident label is not proof of live cells.
What conditions clinics target
Clinics most often market stem cells for orthopedic and cosmetic uses, none of which are FDA approved. The most common pitches are knee, hip, shoulder, and back pain, plus arthritis and hair loss.
Our condition guides cover the cost and logistics angle for knees, back pain, arthritis, and hair loss. We frame them around price and recovery, never around a cure.
Some clinics go further and advertise stem cells for autism, macular degeneration, multiple sclerosis, diabetes, neuropathy, a “stem cell facelift”, or general “anti-aging.” The FDA has not approved stem cells for any of these. It has issued a consumer alert after patients were harmed, including three women who lost vision after an eye injection at a Florida clinic.
The regulatory reality
Stem cells are FDA approved to treat a short, specific list of diseases: certain blood cancers and lymphomas, plus one rare immune condition in children. As of 2026, the full approved list includes:
- Cord blood transplants for leukemia, lymphoma, and other blood disorders.
- Ryoncil (remestemcel-L), approved in December 2024, the first mesenchymal cell drug, for a graft-versus-host condition in children.
Everything else, including every joint injection, is either an unapproved product or a treatment offered under a research exemption. No approval means no standard dose, no required efficacy proof, and no insurance code. Our legality hub explains where this leaves US patients, and how to vet a clinic shows the red flags.
What the evidence does and does not show
In summary, safety in early trials looks reasonable, but proof that the treatment works is still limited. Reviews of stem cells for knee osteoarthritis, including a Cochrane review, find uncertain benefit and note short follow-up and high risk of bias.
That does not mean the treatment is useless. It means the strong claims some clinics make are ahead of the data. Our success rate guide explains why clinic “success” numbers are unreliable.
A common failure mode: a patient reads a clinic’s “90% satisfaction” figure and assumes it equals a proven cure. That figure usually comes from the clinic’s own unpublished survey, not a controlled trial. The two are not the same evidence.
What to do before you commit
Treat a stem cell decision like any major purchase with weak guarantees. Ask what cells you are getting, whether they are living, and what published evidence supports that exact use for your condition.
Then price your alternatives. Physical therapy or a cortisone shot may cost a fraction of the price and is often covered. Our cost hub helps you build the real number before you call a clinic.
The bottom line
Stem cell therapy is a real field of medicine with a few proven, FDA-approved uses and a much larger market of unproven ones. Knowing what stem cell therapy is means separating the approved blood treatments from the joint injections that clinics sell without approval. Use the guides below to check the cells, the cost, the legality, and the evidence before you decide anything.
Frequently asked questions
What is stem cell therapy in simple terms?
Stem cell therapy uses cells that can turn into other cell types, injected or infused to try to reduce inflammation or support repair. Most versions sold in US clinics for joints, pain, or anti-aging are not FDA-approved and are still experimental. A small set of blood and immune treatments are approved and well established.
Is stem cell therapy FDA approved?
Only a narrow set of stem cell products are FDA approved, mainly blood-forming cells from cord blood for leukemia and lymphoma, plus one mesenchymal cell drug (Ryoncil) for a graft-versus-host condition in children. The FDA has not approved stem cell injections for knees, backs, arthritis, or anti-aging. See our FDA status guide.
What conditions do clinics use stem cells for?
Clinics most often market stem cells for knee, hip, shoulder, and back pain, arthritis, and cosmetic uses like hair loss. These uses are not FDA approved and the evidence is mixed. The FDA warns against products sold for autism, macular degeneration, and chronic disease.
What is the difference between your own cells and donor cells?
Autologous cells come from your own body, usually bone marrow or fat, drawn the same day. Donor or allogeneic cells come from another person's umbilical cord or amniotic tissue. Donor products carry a small extra infection and immune risk, and some contain few or no living cells.
How much does stem cell therapy cost?
Stem cell therapy usually costs about $5,000 to $25,000 or more in the US, paid out of pocket rather than through Medicare or private insurance. A single joint injection runs roughly $3,000 to $8,000. See our cost guide for the full breakdown.
What happens if stem cell therapy doesn't work?
If stem cell therapy does not bring the improvement a patient expected, most clinics offer no refund and no guaranteed follow-up care. The product is unapproved, so there is no required efficacy standard to enforce. Insurance will not step in to cover a second procedure or a different treatment, because the original injection was never a covered benefit. The typical fallback is to pay out of pocket again for a conventional option such as physical therapy, medication, or surgery.
Who is not a good candidate for stem cell therapy?
People with active cancer, an uncontrolled infection, a bleeding disorder, or a pregnancy are generally excluded from stem cell therapy. Clinics also turn away anyone on blood thinners they cannot safely pause, or whose autoimmune disease is in an active flare, since an injection can add inflammation. Beyond the medical screen, someone expecting a guaranteed cure, or someone who cannot afford the same cost again if it fails, is a poor fit. No FDA-approved efficacy data backs the treatment yet.
Why are people against stem cell therapy?
People push back on stem cell therapy mainly because clinics oversell an unapproved product. Critics point to the gap between confident marketing and the FDA's own warnings, plus the lack of insurance coverage or a refund if it fails. They also cite documented harm cases, like the vision loss the FDA has flagged. A smaller objection targets donor-tissue sourcing for umbilical and amniotic products, separate from the older embryonic stem cell debate. None of that proves the biology is fake. It means the oversight and the evidence have not caught up to the sales pitch.
Medical disclaimer. Medical Frontier is an independent educational resource. This page is for general information only and is not medical advice, diagnosis, or treatment, and does not create a doctor–patient relationship. Most regenerative therapies discussed here are not FDA-approved for the uses described and may be offered under limited exemptions or in clinical trials only. Always consult a licensed physician before making any treatment decision.