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Stem cell therapy for Parkinson's.

Clinics sell drips of mesenchymal stem cells for Parkinson's. In the best trial, an early gain over placebo had disappeared by one year. Dopamine cells implanted in the brain are a different treatment, now conditionally approved in Japan.[1][2]

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Written by Eli McGarvie.

Clinics that treat Parkinson's.

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ClinicConditionsTreatmentsPrice from
Celltex MéxicoCancún, Mexico Parkinson'sMSDiabetesArthritis MesenchymalIV Not disclosed Panama Cell TherapiesPanama City, Panama Parkinson'sAutismALSMS MesenchymalInjections Not disclosed Vega Stem CellBangkok, Thailand Parkinson'sKneeArthritisAutism Umbilical cordMesenchymalIVInjections Not disclosed

Brain surgery in a trial, or a drip at a clinic

Dopamine cell implants

New dopamine-making cells, grown from stem cells, are placed deep in the brain by surgery. This is the version with a serious scientific record.[3][4] Japan gave one product, AMCHEPRY, a conditional approval in March 2026 based on a seven-patient trial, with seven years of monitoring before it can be fully approved.[2][5]

Clinic infusions

Mesenchymal cells from your own fat or marrow, or from donor cord, given into a vein, the spinal fluid or the nose.[6][7] The Michael J. Fox Foundation says these methods do not turn into the dopamine neurons Parkinson's destroys, or reach where they are needed.[6]

What to expect at a clinic

The procedure

An intravenous drip takes under 15 minutes, as trial participants describe it.[8]

When it works, and how long it lasts

In the best placebo-controlled drip trial, the effect lasted less than 32 weeks after the last infusion.[1] Patients who wanted to keep a benefit describe paying for repeat drips every three to five months.[8]

Who it suits, and who it doesn't

People with atypical parkinsonism showed no change in the one study that included them.[9] Brain implant trials exclude people with frequent falls, dementia or previous brain surgery.[10]

Risks

Drip side effects in trials were mostly mild and short-lived.[11][1] Brain implants carry the risks of neurosurgery and a year of immune-suppressing drugs, and in older fetal-tissue trials 56% of patients developed involuntary movements.[12][13]

Clinic drips: an early gain that disappeared

Does it work? For the drips clinics sell, no lasting benefit has been shown. For brain implants, it is not yet known: the only two blinded trials failed, and the first blinded phase 3 of a modern product does not report before 2027.[14][12][10]

9.3 to 0.47point advantage over placebo at week 20, shrinking to almost nothing by week 52, after repeated donor-cell dripsRandomised placebo-controlled trial, 60 people[1]
14.6 pointsgained by the placebo group in another randomised trial, where everyone improvedRandomised trial, 45 people[15]
4.3 pointsimprovement from sham surgery alone in earlier trials, against 9.5 to 23 points in open implant trials with no control groupPooled sham data; open-label trials[16][3][4]
0 of 11paid clinic patients and relatives who reported online described a lasting improvementOur review of patient accounts on Reddit and forums[8]

Where it is allowed

United States. No cell product is approved for Parkinson's.[17] The FDA has warned a company over stem cell products marketed for Parkinson's.[18]

Japan. AMCHEPRY has a conditional, time-limited approval for patients who respond poorly to existing drugs.[2]

Malaysia. Cultured or donor cells need a trial authorisation or full registration.[19]

Mexico. COFEPRIS has said stem cell treatments lack authorisation.[20]

Common questions

Can stem cells cure Parkinson's?

No. The Parkinson's Foundation says that at best stem cells will relieve movement symptoms, not slow or cure the disease.[21]

What does the Japanese approval mean for me?

It covers one brain-implant product, in Japan, on condition that it proves itself over seven years. It does not apply to drips sold elsewhere.[2][5]

Questions to ask a clinic

  1. Is this a drip, or cells implanted in the brain?
  2. What type of cells, and does the study you cite match what you sell?
  3. Am I being charged to join a trial? Genuine trials do not charge.
  4. How long did the benefit last in your patients, and what do repeat drips cost?
  5. Will my neurologist be involved?
  6. Will this rule me out of a brain implant trial later?

Sources

21 references
  1. ClinicalTrials.gov, US National Library of Medicine. A Randomized, Double-Blind, Single Center, Phase 2, Efficacy and Safety Study of Allogeneic HB-adMSCs vs Placebo for the Treatment of Patients With Parkinson's Disease. 2026. Link
  2. Sumitomo Pharma Co., Ltd. Announcement on the Approval for Manufacturing and Marketing Authorization of the Allogeneic iPS Cell-Derived Dopaminergic Neural Progenitor Cell Product "AMCHEPRY" in Japan. 2026. Link
  3. Tabar V, et al. Phase I trial of hES cell-derived dopaminergic neurons for Parkinson's disease. Nature, 2025. Link
  4. Sawamoto N, et al. Phase I/II trial of iPS-cell-derived dopaminergic cells for Parkinson's disease. Nature, 2025. Link
  5. Parkinson's UK. Stem cell treatment for Parkinson's approved in Japan. 2026. Link
  6. The Michael J. Fox Foundation for Parkinson's Research. Stem Cells and Parkinson's: Clinical Trials Hold Promise; Stem Cell Clinics Warrant Caution. 2021. Link
  7. Parkinson's UK. Stem cell therapy for Parkinson's: Are we getting closer? 2026. Link
  8. StemFinder review of first-hand patient accounts on Reddit and patient forums, 2026. Method
  9. Venkataramana NK, et al. Bilateral transplantation of allogenic adult human bone marrow-derived mesenchymal stem cells into the subventricular zone of Parkinson's disease: a pilot clinical study. Stem Cells International, 2012. Link
  10. ClinicalTrials.gov, US National Library of Medicine. exPDite-2: A Phase 3 Study to Assess the Efficacy and Safety of Midbrain Dopaminergic Neuronal Cell Therapy (Bemdaneprocel) for Participants With Parkinson's Disease. 2026. Link
  11. Schiess M, et al. Allogeneic Bone Marrow-Derived Mesenchymal Stem Cell Safety in Idiopathic Parkinson's Disease. Movement Disorders, 2021. Link
  12. Olanow CW, et al. A double-blind controlled trial of bilateral fetal nigral transplantation in Parkinson's disease. Annals of Neurology, 2003. Link
  13. Mamaril-Davis JC, et al. Procedure-Related Complications in Sham Surgeries for Parkinson's Clinical Trials: A Meta-analysis. Movement Disorders, 2023. Link
  14. Freed CR, et al. Transplantation of embryonic dopamine neurons for severe Parkinson's disease. The New England Journal of Medicine, 2001. Link
  15. Schiess MC, et al. Allogeneic Bone Marrow-Derived Mesenchymal Stem Cells for Parkinson's Disease: A Randomized Trial. Movement Disorders, 2025. Link
  16. Polgar S, et al. The Placebo Response in Double-Blind Randomised Trials Evaluating Regenerative Therapies for Parkinson's Disease: A Systematic Review and Meta-Analysis. Journal of Parkinson's Disease, 2022. Link
  17. U.S. Food and Drug Administration. Approved Cellular and Gene Therapy Products. U.S. Food and Drug Administration, Center for Biologics Evaluation and Research, 2026. Link
  18. US Food and Drug Administration. FDA puts company on notice for marketing unapproved stem cell products for treating serious conditions. 2019. Link
  19. National Pharmaceutical Regulatory Agency, Ministry of Health Malaysia. Guidance Document and Guidelines for Registration of Cell and Gene Therapy Products (CGTPs) in Malaysia, Second Edition (September 2025). 2025. Link
  20. Comision Federal para la Proteccion contra Riesgos Sanitarios. La COFEPRIS suspendio clinica del D.F. que ofrecia tratamientos con Celulas Madre sin aval cientifico. Comision Federal para la Proteccion contra Riesgos Sanitarios, Secretaria de Salud, Gobierno de Mexico, 2015. Link
  21. Parkinson's Foundation. Two New Trials Explore Stem-Cell Therapy for Parkinson's. 2025. Link

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