Stem Cell Treatment vs. Proven Medicine: Here’s What Researchers Say the Evidence Actually Shows
Tens of thousands of patients are boarding planes each year for stem cell treatment that no major medical body has cleared as safe or effective for what’s being sold. The clinics are charging tens of thousands of dollars per procedure. The marketing is slick. The science, in nearly every case outside of certain blood cancers, isn’t there — and a recent U.S. court fight over who gets to regulate this industry has only sharpened the stakes for people considering it.
That gap between what’s promised and what’s proven is the heart of what researchers call “stem cell tourism,” and it’s reshaping how doctors talk to patients about hope, risk and what counts as medicine.
How Stem Cell Treatment Actually Works
The first stem cell transplant took place more than 60 years ago. Since then, research has shown that stem cell transplantation can be a safe and effective treatment for blood cancers — leukemia, lymphoma and myeloma — and certain non-cancerous blood disorders.
“A stem cell transplant – sometimes called hematopoietic stem cell transplantation – is a complex medical procedure that can be used to treat blood cancers,” according to City of Hope.
The mechanism is straightforward: patients with blood cancers receive chemotherapy, sometimes combined with radiation, to kill cancer cells. A stem cell transplant then replaces the destroyed cells with new, healthy ones. Bone marrow transplantation is the only stem cell treatment that is not considered experimental. Cancer is the only disease category for which there is published, scientifically valid evidence that stem cell therapy may help.
Why Stem Cell Tourism Is Booming
An increasing number of clinics worldwide are advertising stem cell transplants as a way to treat — or even cure — a sweeping list of health conditions without any science to back up those claims. Hundreds, if not thousands, of clinics now market unapproved procedures for everything from common sports injuries to neurological diseases.
The trend was the subject of a panel hosted by the Harvard Stem Cell Institute. Timothy A. Caulfield, the Canada Research chair in health, law, and policy at the University of Alberta, said the phenomenon “hurts the legitimacy of the entire field” of stem cell science and medicine.
In December 2025, the FDA approved a gene-based stem cell therapy for Wiskott-Aldrich syndrome, a rare and life-threatening genetic disease. But that standard of evidence — and FDA approval itself — are not the norm for the broader market patients encounter online.
What the Science Says About Unproven Stem Cell Treatment
George Daley, MD, PhD, a member of the Harvard Stem Cell Institute’s executive committee and past president of the International Society for Stem Cell Research, said legitimate clinical trials are growing, “but all such uses are experimental … and there is great skepticism as to whether we have” the scientific knowledge and basis even to “predict that these will be effective.” “It may,” he said, “take decades before there is certainty.”
The clinics selling stem cell therapy for a wide catalog of diseases are not offering patients spots in clinical trials. They are marketing what they claim are established treatments with proven results. Caulfield’s research found that “none of what is being offered matched what the scientific literature said.” He accused the clinics of “financial exploitation” of desperate people.
The Health Risks Patients Face
Studies have reported patients suffering short- and long-term side effects from unregulated procedures, including heart problems, neurological changes, accidental infection with hepatitis and urinary incontinence. Some patients have died from organ failure caused by unlicensed stem cell transplantation.
“I have seen patients over the years who had terrible diseases, like ALS, traveling to people who called themselves doctors and who were offering ‘stem cell therapies’ in unusual locations,” Stephen J. Forman, M.D., a blood cancers expert and director of the Hematologic Malignancies Research Institute at City of Hope Cancer Center, told City of Hope. He noted that travel risks and the financial burden can also be significant.
The FDA filed two lawsuits in 2018 against clinics promoting unapproved stem cell therapies and won a key court case in late 2024 confirming its authority to regulate them. In October 2025, the U.S. Supreme Court declined to reconsider the decision.
For more information: How to Tell if a Wellness Retreat Is Legit Before You Spend Thousands and Some Red Flags
Jill Lepore, PhD, chair of Harvard’s History and Literature Program, framed the cultural pull plainly: there is a kind of “faith in science that draws” some people to any promise of a cure, no matter how specious. What fuels false hope, she said, is “one of the most dangerous elements of our culture: that we have forgotten how to die.”
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