Stem cell therapy is legal in the U.S., but only in limited cases. A small number of products are FDA-approved, while most stem cell injections marketed for joint problems, pain, or anti-aging are not.
Even so, clinics can offer many of these procedures because of a narrow tissue exemption and slow enforcement. Before you pay, it’s important to understand that “for sale” does not mean “approved.”
This hub breaks down the law in plain English. It explains what the U.S. Food and Drug Administration has actually cleared, what clinics offer under an exemption, and what can happen when the FDA takes action.
The law in plain English
You can legally receive some stem cell procedures in the US, but “legal to offer” is not the same as “proven or approved.” Three tiers explain almost every situation you will meet.
Tier 1: FDA-approved products. These have passed clinical trials and carry an approved use. They cover blood and immune disorders, not orthopedic pain.
Tier 2: Products sold under the 361 tissue exemption. These skip pre-market approval if they meet strict rules. The FDA says most joint and systemic uses do not qualify.
Tier 3: Unapproved products. These are sold anyway. The FDA can issue warning letters, seek injunctions, or refer for prosecution, but it does not catch every clinic.
Most clinics selling knee, hip, or anti-aging injections sit in Tier 2 or Tier 3. That is the core of the confusion.
What the FDA has approved
The FDA has approved blood-forming stem cell transplants and a small number of cell products. Hematopoietic stem cell transplants, using cells from bone marrow or cord blood, are the oldest approved use. They treat leukemia, lymphoma, sickle cell disease, and other blood and immune conditions.
The agency has also approved a few named products. Ryoncil (remestemcel-L), cleared in late 2024, treats steroid-refractory graft-versus-host disease in children. In June 2026, the FDA approved Tregzi, a cell therapy used with matched-donor transplants. Cord-blood products for blood reconstitution are approved too.
None of these are for knee arthritis, back pain, or general “anti-aging.” Our FDA status guide lists the full approved set and what each one is for.
The 361 exemption in plain English
The 361 exemption lets a clinic skip FDA approval only if the cells meet four strict tests. The rule comes from Section 361 of the Public Health Service Act and the tissue regulations in 21 CFR Part 1271. To qualify, the product must be all of the following.
- Minimally manipulated. The processing must not change the cells’ basic biological features.
- Homologous use only. The cells must do the same job they did in the body they came from.
- Not combined with another drug or device, with narrow exceptions.
- No systemic effect that depends on the cells being alive, except for certain uses.
Most orthopedic and IV stem cell products fail at least one test. Culturing cells to grow more of them counts as more than minimal manipulation. Injecting fat or cord cells into a joint to fix cartilage is often not homologous use. When a product fails these tests, the FDA treats it as an unapproved drug.
State laws on unapproved stem cell therapy
Federal FDA rules apply nationwide, so a state law does not turn an unapproved cell product into an approved one. Several states have passed laws that give local clinicians room to offer investigational or unapproved stem cell procedures under state statute. These state rules alter local medical practice boundaries, but they do not substitute for federal market clearance or prove a treatment works.
Texas enacted House Bill 810, known as Charlie’s Law, effective September 1, 2017. The law allows patients with severe chronic diseases or terminal illnesses to access investigational adult stem cell treatments that are currently in a clinical trial and not approved by the FDA for general use. Patients must provide written informed consent, which a parent, guardian, or conservator may sign for minors or patients lacking capacity.
Utah passed Senate Bill 199, effective May 1, 2024, becoming the first state to explicitly cover placental and cord blood derived products under this type of statute. Providers whose scope includes stem cell therapy may offer treatments not approved by the FDA if they give patients written notice of that unapproved status and encourage them to speak with a primary care provider. The International Society for Cell & Gene Therapy criticized the Utah law, stating it undermines FDA authority and risks legitimizing unproven interventions.
Florida enacted Senate Bill 1768, effective July 1, 2025, permitting licensed medical doctors and osteopathic physicians to administer stem cell therapies not approved by the FDA for orthopedics, wound care, or pain management. The Florida statute requires:
- Signed informed consent and prior written notice stating the therapy is not FDA-approved.
- Facility accreditation covering how cells are retrieved, manufactured, stored, and used.
- Compliance with a total ban on stem cells derived from aborted fetuses, backed by criminal penalties.
If you are considering a clinic in one of these states, check whether the procedure is part of a legitimate study or a direct-to-consumer cash offering. You can compare the differences in our guide on clinical trials vs cash clinics and verify the therapy against our FDA status guide before signing consent forms.
Enforcement: what actually happens
Enforcement exists but is uneven, so an unapproved product can stay on the market for years. The FDA ended its regenerative-medicine grace period in May 2021. Since 2017 it has sent roughly 400 letters to clinics and manufacturers and issued dozens of formal warning and untitled letters.
The agency has also won court action against some larger operators. Still, the FDA cannot inspect every clinic, and a warning letter is not an instant shutdown. Some clinics change wording, some keep selling, and some close only after a patient is harmed.
For you, the takeaway is direct. A clinic operating today does not mean its product is legal or approved. It may mean it has not been reviewed yet.
Legal to sell vs safe to buy
A treatment can be legal to sell and still be a poor choice, so separate the two questions. Legality tells you whether the FDA has cleared or tolerated a product. It says nothing about whether the therapy is proven, or whether one specific clinic is competent.
That is why this hub pairs with our safety work. The most useful thing you can do is check a clinic against known red flags before you pay a deposit. Our guide on how to vet a clinic turns the law above into concrete questions to ask.
Going abroad: still a legal choice
Traveling overseas for an unapproved stem cell therapy is legal for US patients. Nothing in US law stops you from getting a treatment abroad that the FDA has not approved. Many patients go to Mexico or other countries for lower prices and faster access.
The trade is oversight. Foreign regulators such as Mexico’s COFEPRIS set their own rules, and quality varies by clinic, not just by country. Our comparison of the best countries for stem cell therapy weighs regulation, cost, and access, without making any claim about whether the treatments work.
The bottom line on US legality
Is stem cell therapy legal in the US? A few approved products are fully legal, but most joint, pain, and anti-aging injections are unapproved and sold under an exemption the FDA disputes. Legal availability is not proof of approval, safety, or benefit. Learn what the FDA has cleared, understand the 361 exemption, and vet any clinic hard before you spend a dollar. An informed decision starts with the real legal status, not the marketing.
Frequently asked questions
Is stem cell therapy legal in the United States?
Offering some stem cell procedures is legal, but most joint, pain, and anti-aging stem cell products are not FDA-approved. A handful of blood and immune therapies are approved. Everything else is sold either inside a narrow tissue exemption or as an unapproved product the FDA can act against.
Can a US clinic legally inject stem cells into my knee?
It depends on the product. A same-day procedure using your own minimally processed tissue may fall under a tissue rule, but many cultured or donor-cell knee injections are unapproved drugs. The FDA has sent hundreds of letters to clinics marketing these for orthopedic use.
What stem cell treatments has the FDA actually approved?
The FDA has approved blood-forming stem cell transplants and a small set of cell products such as Ryoncil for pediatric graft-versus-host disease and cord-blood products. See our FDA status guide for the full approved list.
Is it legal to go to Mexico for stem cell therapy?
Yes. You can legally travel abroad for stem cell therapy that is not approved in the US. Mexico regulates clinics through COFEPRIS, but oversight and quality vary. See our Mexico guide before you book.
Why do so many clinics operate if the treatments are not approved?
Many clinics rely on a tissue exemption meant for minimally manipulated cells used for the same purpose they came from. The FDA says most joint and systemic uses fall outside that exemption, but enforcement is limited and slow, so clinics keep operating.
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.