Short answer: The warning signs below come from the International Society for Stem Cell Research (ISSCR), the US Food and Drug Administration (FDA), two peer-reviewed articles and Thai legal and news sources, all read on 7 November 2026. Each one has a one-line reason and the source it comes from. A single sign means ask more questions. Several together mean walk away or wait. We do not rate or name any clinic here.
The ISSCR says to ask many questions about any unproven stem cell "treatment" and to get a second opinion from a trusted, qualified physician. It also says you should not be rushed or financially enticed to decide. The eight signs below are ways that advice gets ignored in practice.
1. Promised results or a permanent fix
Why it matters: The ISSCR lists "claims that there is no risk" as a warning sign and says there is always risk involved with treatment. Under Thai law, as Tilleke & Gibbins describe it, an advertisement for a medical facility may not carry false, exaggerated or misleading statements, and the risky examples they give include promising specific results or suggesting a treatment gives a permanent result. On 5 August 2026 a Thai civil court held a clinic liable over ads that claimed a treatment "allegedly using stem cell technology" could permanently remove acne scars.
2. One treatment for many unrelated conditions
Why it matters: The ISSCR says stem cell treatments are not "one-size-fits-all" and that different diseases would be expected to need different cell types. Rodeo (2024) calls claims of efficacy for an implausibly wide range of different conditions perhaps the most common red flag. Cook and colleagues found that the businesses they studied offered treatments for many different conditions.
3. Pressure to book fast, discounts, and early payment
Why it matters: The ISSCR says you should not be "rushed or financially enticed" into a decision. Rodeo gives a real promotional email as an example: "End of Year Blowout Sale: 3 for 1 on Exosomes or Whartons Jelly." A request for a deposit before a doctor has seen your records is our own addition to this list. We did not find a source that addresses deposits directly, so treat it as our suggestion based on the ISSCR advice.
4. No named doctor and no license number
Why it matters: Pattaya Mail (29 April 2026) reports the Medical Council's secretary-general advising the public to check that clinics clearly display their name, license number and attending physician. It also reports the Council warning that unregistered or expired facilities may pose serious safety and legal risks. The ISSCR says the doctors involved should specialize in your disease or condition. Ask for the doctor's full name and license number in writing.
5. No written product information and no lab report
Why it matters: The ISSCR lists, as a warning sign, a source of cells or a method of treatment that is not clearly documented. It says this should be explained in a consent form and that you should be able to ask for the protocol. It also asks whether the clinic and the facility that processes the cells have credible independent oversight or accreditation. Nation Thailand (27 May 2026) reports that cell products grown in a lab need Thai FDA registration, and that expanded MSC and NK cell preparations need batch-release testing. Ask what you are receiving and who prepared it.
6. Testimonials as the main evidence
Why it matters: The ISSCR lists claims based on patient testimonials as a warning sign and notes that patients can sometimes see a perceived benefit that is not caused by the treatment itself. Cook and colleagues found that 42 of 59 businesses (71 percent) used testimonials, which they described as almost exclusively cherry-picked. Of 261 articles cited by 21 businesses, only 2 percent directly supported the treatment on offer.
7. "FDA approved" or "registered" used as if it meant approved
Why it matters: Cook and colleagues found two businesses that explicitly claimed their stem cell products were FDA-approved, which is the kind of claim this guide warns about. The FDA says it has not approved regenerative medicine therapies for any orthopedic condition. It also says that being in the ClinicalTrials.gov database, or a firm registering with the FDA, does not mean a product is legally marketed. These are US statements. For Thailand, ask for the product's Thai registration number or the research protocol's ethics approval, and see Is stem cell therapy legal in Thailand?. A claim of approval that you cannot check on paper is itself the warning sign.
8. No plan for complications
Why it matters: The ISSCR lists high or hidden costs as a warning sign, including the cost of emergency medical care if something goes wrong, particularly outside your own country. The FDA says it has received reports of blindness, tumor formation and infections linked to unapproved products. If a clinic cannot tell you in writing who treats a complication and who pays, you would carry that risk alone.
A related sign: paying to join a "trial"
The ISSCR says it is not customary to pay to be in a clinical trial. Rodeo (2024) makes a similar point about patients asked to pay to enter a so-called trial, where in standard trials the sponsor covers treatment costs. If a clinic calls its treatment research and also charges you for it, ask who approved the protocol and when that approval expires.
What to do next
Send the clinic our 10 questions in writing and keep the replies. Read Who should not have stem cell treatment before you travel. For prices, see what stem cell therapy costs in Thailand. Whatever you decide, talk it through with your own doctor first.
More on stem cell therapy in Bangkok: published prices and five questions to ask any clinic.
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Frequently asked questions
Does one red flag mean a clinic is a scam?
No. A single warning sign is a reason to ask for more information in writing. The ISSCR describes these signs as things to be wary of in a company advertising an unproven treatment. They are not a verdict on any one clinic.
Is a clinic trustworthy if it says its lab is FDA-registered?
Not on that fact alone. Rodeo (2024) gives the example of a company describing its product as made in an FDA-registered, cGMP-compliant, ISO-certified lab, and notes that registration or inspection does not mean the product is approved for use. Ask for the product's own registration or research approval instead.
What if a clinic shows me a clinical trial listing?
The US FDA says that being in the ClinicalTrials.gov database, or a firm being registered with the FDA, does not mean a product is legally marketed. The FDA also says patients are often referred to that database in misleading ways. Ask who approved the trial protocol and when that approval expires, as the ISSCR advises.
What should I do if I notice a red flag?
Stop and ask for answers in writing. Our checklist of 10 questions to ask a stem cell clinic covers the doctor, the license, the product, the lab report, the quote and the follow-up. Then discuss the answers with your own doctor.
Sources
- The ISSCR Guide to Stem Cell Treatments
- Important Patient and Consumer Information About Regenerative Medicine Therapies
- Marketing of Unproven and Unapproved Regenerative Medicine Therapies
- Weighing up the evidence used by direct-to-consumer stem cell businesses
- Court Judgment Reaffirms Rules On Advertising Of Medical Facilities In Thailand
- Thailand urges public to check clinic licenses online to avoid illegal treatment risks
- Thailand Makes History With Landmark Stem Cell Decree
You pay us nothing. Once clinics join, they cover our costs, which can include a referral fee. This means we will have a financial interest in you going ahead with a clinic we suggest.
A patient referral service, not a medical provider. This page is general information and does not replace advice from a doctor who knows your case. For most conditions named here, stem cell therapy is not standard treatment in Thailand, and results vary.