Stems Cells and Neurodegenerative disease

Stem cell therapy cannot cure any neurodegenerative disease today. No stem cell product is approved to treat ALS, Alzheimer’s disease, multiple sclerosis (MS) or Parkinson’s disease. What is real is a fast-moving body of clinical research. Some trials have shown that stem cells are generally safe, a few have found encouraging signals, and several have failed. This guide explains, in plain language, how far the research on stem cells and neurodegenerative disease has got for each condition, what mesenchymal stem cells (MSCs) can and cannot do, and how to judge a clinic if you are considering treatment.

Stem Cell Therapy for Neurodegenerative Diseases: What It Means

Neurodegenerative diseases are conditions in which nerve cells in the brain, spinal cord or nerves are gradually damaged or lost. Current medicines mainly slow progression or ease symptoms, which is why many families look into stem cell therapy for neurodegenerative diseases.

Researchers are testing two very different approaches:

• Cell replacement. Laboratory-grown nerve cells, made from embryonic stem cells or induced pluripotent stem cells (iPSCs), are implanted into the brain by surgery to replace cells that have been lost. This is being tested mainly in Parkinson’s disease.

• Supportive or immune-modulating therapy. Cells such as MSCs, usually given by intravenous (IV) drip or into the spinal fluid, release signals that may calm inflammation and support surviving nerve cells. This is being tested in ALS, Alzheimer’s disease and MS.

Which Neurodegenerative Diseases Can Stem Cells Treat?

None of these conditions can yet be treated with stem cells as a proven therapy. The table below shows how far research has got for each one.

Our neuropathy guide covers nerve damage in the hands and feet in more detail.

How Do Stem Cells Help the Nervous System?

MSCs do not turn into new brain cells in any meaningful number. Researchers think they work mainly by releasing signals, including growth factors, anti-inflammatory molecules and tiny particles called exosomes. In the lab and in animal studies, these signals can:

• calm overactive immune cells, including microglia, the brain’s own immune cells

• support the survival of nerve cells that are under stress

• encourage repair of the protective coating around nerves, which matters in MS

• improve blood supply to damaged tissue

📌 If you’re interested in how MSCs calm overactive immune cells throughout the body, we have an interesting article that discusses mesenchymal stem cell therapy for immune modulation, which you can read via the internal link.

One point is often misunderstood. When MSCs are given by IV drip, most of them are caught in the lungs and other organs within hours, and few if any reach the brain. Any effect on the brain is thought to come from the signals they release into the blood, not from cells settling in the brain and rebuilding it.

Can Stem Cells Repair Brain Damage From Neurodegenerative Disease?

Not in the way most people hope. No human study has shown that stem cells rebuild brain tissue lost to Alzheimer’s disease, ALS or MS. The closest thing to “repair” is the Parkinson’s cell replacement research, where implanted cells have been shown on brain scans to survive and produce dopamine.

Mesenchymal Stem Cells for Neurodegenerative Diseases: What They Can and Cannot Do

What MSCs can do, based on current evidence:

• They are generally well tolerated. In published neurology trials, side effects have mostly been mild, such as fever, headache or tiredness after an infusion.

• They reduce inflammation in laboratory and animal models.

• In small trials, they have produced some encouraging signals, such as slower brain shrinkage in early Alzheimer’s disease.

What MSCs cannot do, based on current evidence:

• They cannot cure, stop or reverse any neurodegenerative disease.

• They cannot replace lost nerve cells.

• They cannot replace proven medicines, such as disease-modifying therapies for MS or dopamine medicines for Parkinson’s disease.

Umbilical Cord Stem Cells for Neurological Disorders

Umbilical cord MSCs (UC-MSCs) come from cord tissue donated after healthy births. They are young cells, they do not require a harvesting procedure, and they rarely trigger an immune reaction, which is why many clinics prefer cord-derived cells. However, most of the major neurology trials so far used MSCs from bone marrow, not umbilical cord. Results from one cell source cannot be assumed to apply to another, so the evidence for UC-MSCs in neurological disorders is still limited.

iPSC vs Mesenchymal Stem Cells for Neurodegenerative Disease

Stem Cell Therapy for Alzheimer’s

The most advanced MSC work in Alzheimer’s disease is the CLEAR MIND trial of laromestrocel (Lomecel-B), a donor MSC product made from bone marrow. In this randomized, placebo-controlled phase 2a trial, 49 people aged 60 to 85 with mild Alzheimer’s disease received IV infusions of the cells or a placebo. The trial met its main goal of safety. Over 39 weeks, people who received the cells also lost brain volume more slowly than those on placebo, and some groups scored better on a memory and thinking test.

These are early results from a small, company-funded study with about 12 people in each group. In March 2025, the U.S. FDA agreed a path for a larger pivotal phase 2/3 trial that could support an application for approval if the results are positive.

Stem Cell Clinical Trials for Alzheimer’s

If you or a family member want to take part in research, search ClinicalTrials.gov for “Alzheimer’s” and “mesenchymal”. A genuine trial has a registration number and ethics approval, and does not charge a full treatment price.

Stem Cell Therapy for ALS

ALS (also called motor neurone disease) has been a major focus of stem cell research, with disappointing results so far. The best-known product, NurOwn, uses a patient’s own MSCs that are treated in the lab to release more growth factors and then injected into the spinal fluid. In a phase 3 trial of 189 patients, it did not meet its main goal of slowing the disease compared with placebo. In 2023, an FDA advisory committee voted that the evidence did not show it was effective, and the company withdrew its application. A new placebo-controlled phase 3b trial has been designed but, as of March 2026, was still awaiting funding.

Can Stem Cells Cure ALS?

No. No stem cell treatment has been shown to cure ALS or to slow it in a large controlled trial. Patients should continue approved ALS medicines and consider stem cells only within a registered trial.

Stem Cell Therapy for Multiple Sclerosis

MS is different from the other conditions here, because one type of stem cell treatment already has strong evidence. Autologous haematopoietic stem cell transplantation (aHSCT) uses the patient’s own blood stem cells after high-dose chemotherapy to “reset” the immune system. In a randomized trial of 110 people with relapsing-remitting MS, far fewer people who had aHSCT got worse than those who stayed on drug treatment. aHSCT is an intensive hospital treatment with serious risks, and it is offered by specialist MS and transplant centres, not as a clinic infusion.

MSCs have shown mixed results in MS. In a 48-patient trial in progressive MS, bone marrow MSCs led to fewer cases of worsening than a sham treatment, especially when given into the spinal fluid. However, a larger international trial of 144 patients found that IV bone marrow MSCs did not reduce new brain lesions compared with placebo. Approved disease-modifying medicines remain the foundation of MS care.

Stem Cells and Parkinson’s Disease

Parkinson’s disease is where cell replacement has made the most progress. In 2025, two small early trials in Nature reported that dopamine-producing cells made from embryonic stem cells and from iPSCs survived after being implanted, with no major safety concerns, and a phase 3 trial has since begun. For a full picture, see our guide on what Parkinson’s stem cell trial research really shows.

Are Stem Cell Treatments for Neurological Diseases Safe?

In well-run clinical trials, MSC infusions have generally been well tolerated. Common short-term effects include fever, headache and tiredness. Injections into the spinal fluid can cause headache, back pain and short-lived nerve irritation.

The biggest risks come from unregulated providers. Reported harms include infections, blindness and tumours that grew from injected cells. Ask for a certificate of analysis showing cell count, sterility and the percentage of living cells in your dose.

📌 If you’re interested in why the percentage of living cells matters so much at the time of treatment, we have an interesting article that discusses the importance of cell viability in UC-MSC stem cell therapy, which you can read via the internal link.

Stem Cell Therapy for Neurodegenerative Diseases in Thailand

In Thailand, routine stem cell treatment is permitted only for a short list of blood disorders. Any other use, including for neurological conditions, must take place within a research protocol approved by the Medical Council of Thailand and an ethics committee. Before booking, ask any clinic in Thailand for:

• the approval number of its research protocol

• the licence and GMP certification of the laboratory that grows the cells

• the name and specialty of the doctor in charge, ideally a neurologist

• a certificate of analysis for your batch of cells, including surface markers such as CD73, CD90 and CD105

• a written, itemised quote, so you can compare treatment costs in Thailand fairly

📌 If you’re planning treatment in Thailand and want a practical checklist for choosing a safe clinic, we have an interesting article that discusses whether stem cell therapy is safe in Thailand, which you can read via the internal link.

A clinic that promises a cure, cannot show these documents, or suggests stopping your current medicines is a warning sign.

Frequently Asked Questions

Can stem cells cure ALS, Alzheimer’s, MS or Parkinson’s disease?

No. No stem cell treatment can cure any of these conditions. Some are being tested in clinical trials, and a few have shown early promise, but none is an approved treatment.

Which neurodegenerative diseases can stem cells treat?

None as a proven, approved therapy. Research is most advanced in Parkinson’s disease (cell replacement) and early Alzheimer’s disease (MSCs). For MS, blood stem cell transplant (aHSCT) has strong evidence for some patients with active relapsing disease.

Are stem cell treatments for neurological diseases safe?

In regulated trials, MSC infusions have generally been well tolerated, with mostly mild short-term side effects. Serious harms have been reported from unregulated clinics, so the provider and laboratory matter a great deal.

Is stem cell therapy for neurodegenerative diseases available in Thailand?

In Thailand, stem cell use for neurological conditions must take place within research approved by the Medical Council of Thailand. Ask any provider for its protocol approval number before you book.