A recent article1 focused attention on the proliferation of unregulated clinics in the U.S. that promise stem cell cures. The term “stem cell” used to have meaning only to scientists. It referred to cells that can both make new copies of themselves and turn into different types of mature cells.

Stem cell is a fitting term for the cells in bone marrow that are transplanted to people in an attempt to save them from leukemia. Bone marrow transplants require killing a patient’s own cancerous bone marrow and replacing it with cells that produce all the types of blood cells found in the body. A bone marrow transplant to replace the blood system is the only stem cell therapy that is FDA approved as being safe and effective.

But investments like California’s $3 billion for stem cell research in 2004 and similar efforts worldwide have added stem cell to the vocabulary of a growing number of people. Positive press from funding agencies has raised not only the public’s expectations for miraculous stem cell cures, but also a geographic and institutional bidding war for scientists pursuing cures for the most intractable diseases.

Enter the opportunists. The Wikipedia description of the grifters who peddled snake oil in the early 1900s has a troubling similarity to the marketing by the unregulated stem cell clinics of today. “ …a ‘doctor’ with dubious credentials, selling fake medicines with boisterous marketing hype, often supported by pseudo-scientific evidence. To increase sales, an accomplice in the crowd (a shill) would often attest to the value of the product in an effort to provoke buying enthusiasm.”

Like snake oil salesmen, clinics claiming astonishing curative results from stem cell treatments often do not have licensed physicians administrating the treatments, no scientific evidence supporting their work, and they rely on testimonials for advertising and promoting the value of their product.

The first stem cell clinics started in countries where the regulatory climate was less rigorous than that of the U.S. These clinics emerged in China, Mexico, the Bahamas, and even in European countries where loopholes in regulations allowed the clinics to operate. In 2011, a large clinic in Germany was closed after the death of an 18-month-old boy who received an injection of cells into his brain.2 The clinic’s director was not prosecuted and soon established another stem cell clinic in Beirut, Lebanon, where new loopholes in regulation could be exploited.

Like a money-making franchise, stem cell clinics have begun to spread to the U.S. Anyone who visits or lives in Florida or California will have noticed billboards and full-page advertisements for U.S. clinics offering stem cell therapies that have not been confirmed to be safe and effective.

The websites are typically strong on mission statements but short on specifics. They claim that their treatments are noninvasive and preferable to surgery. They emphasize the miracle of the customer’s own cells being used to treat their condition.

What’s wrong with using someone’s own cells? What is wrong is that the cells used by these clinics are not useful for therapy. The cells are either an extract of fat tissue that is removed from the patient by liposuction or cells from bone marrow. These cells are simply incapable of turning into any of the cell types that are damaged by Alzheimer’s disease, Parkinson’s disease, diabetes, multiple sclerosis, COPD, ALS, cerebral palsy, autism, spinal cord injury, or traumatic brain injury.

In fact, cells taken from one source like fat, and put somewhere else, like the bloodstream, do not even survive beyond a few hours. They have no demonstrated medical benefit.

The clinics offer no functional rationale for their treatments. Instead, they seek legitimacy by association. One strategy is to link their websites to scientific publications that relate to the given condition and stem cells. To give an example, there are reports that show that stem cell transplants can restore short-term memory to mice that have some characteristics of Alzheimer’s disease. As a preclinical investigation the work has real value. But this does not mean that such a therapy is likely to work in humans, and a great deal more research is required before any legitimate medical practitioner would consider trying it on people.