On this page
- The trial in neuropathy itself
- The related evidence in foot ulcers
- Nerve pain is the hardest symptom to study
- Whether damaged nerves can recover
- Causes other than diabetes
- What established treatment offers
- How nerve damage is measured
- Realistic expectations
- Questions worth asking
- Frequently asked questions
- Requesting a medical evaluation
Peripheral neuropathy — burning, numbness and pain in the feet and hands — affects millions of people with diabetes and is poorly served by existing drugs. Stem cell therapy for neuropathy has been tested in a randomised phase 2a trial, which makes it better evidenced than most of what is sold alongside it.
The trial in neuropathy itself
A phase 2a randomised controlled study examined a placenta-derived cell product in diabetic peripheral neuropathy — Phase 2a randomized controlled study investigating the safety and efficacy of PDA-002 in diabetic peripheral neuropathy.
Phase 2a is early-stage: small, safety-focused, designed to decide whether to continue rather than to establish benefit.
That a controlled trial was run at all is meaningful. Nerve symptoms respond strongly to expectation, and uncontrolled studies in this area are worthless for that reason.
The related evidence in foot ulcers
A randomised controlled study tested cord-derived cell injection in diabetic foot ulcers — Prospective, Randomized, and Controlled Study of a Human Umbilical Cord Mesenchymal Stem Cell Injection for Treating Diabetic Foot Ulcers.
A phase 2 multi-centre randomised double-blind placebo-controlled trial studied the same placenta-derived product in foot ulcers — Human Placenta-Derived Cells (PDA-002) in Diabetic Foot Ulcer Patients With and Without Peripheral Artery Disease: A Phase 2 Multi-Center, Randomised, Double-Blind, Placebo-Controlled Trial.
Ulcers and neuropathy are connected — numb feet get injured without being noticed — but healing a wound and restoring nerve function are different outcomes. Diabetic foot ulcer covers that evidence directly.
Nerve pain is the hardest symptom to study
Neuropathic pain responds to placebo at rates among the highest in medicine. Trials of established drugs routinely show forty per cent or more of placebo patients reporting meaningful pain reduction.
It also fluctuates with sleep, mood, temperature and blood glucose, none of which stays constant across a treatment trip.
This is why a controlled trial matters more here than almost anywhere else, and why testimonials from this group should carry no weight at all in a decision.
Whether damaged nerves can recover
Peripheral nerves can regrow, unlike nerves in the brain and spinal cord, but slowly — roughly a millimetre a day — and only if the underlying cause stops.
In diabetic neuropathy, the underlying cause is ongoing metabolic damage. Without glucose control, nerves keep being damaged faster than they recover, and no injected cell changes that arithmetic.
Compression neuropathies are a different matter entirely. A trapped nerve at the wrist or elbow is a mechanical problem with a surgical answer, and treating it as a candidate for infusion is a diagnostic failure rather than a treatment choice.
Causes other than diabetes
Neuropathy also follows chemotherapy, alcohol excess, B12 deficiency, thyroid disease, kidney failure, several infections, and a list of inherited and autoimmune conditions.
Some of those are treatable in ways that improve the nerves, and identifying them matters far more than any regenerative option.
A substantial proportion of neuropathy remains idiopathic after full investigation. Honest care includes saying so rather than offering a treatment to fill the gap.
What established treatment offers
Glucose control, which is the only intervention shown to slow progression in diabetic neuropathy.
Drugs for the pain — several classes with randomised evidence, all with meaningful side effects and none reliably effective for everyone.
Foot care and protection, which prevents the ulceration and amputation that represent the serious end of this condition. That is unglamorous and it is where the demonstrated benefit is.
Physiotherapy and balance work matter too, because numb feet make falls more likely and a fall in an older patient carries consequences well beyond the neuropathy itself.
Alpha-lipoic acid and several other supplements have been studied with mixed results, and are at least inexpensive. That is a low bar, and it is a higher one than most of what is sold alongside cell therapy clears.
How nerve damage is measured
Nerve conduction studies measure how fast and how strongly signals travel along the larger nerves, and they are objective and repeatable.
They also miss small-fibre neuropathy, which is what causes burning pain in many patients and needs skin biopsy or specialised testing to demonstrate. Someone can have severe symptoms and entirely normal conduction studies.
Symptom questionnaires and sensation testing with monofilaments fill the gap and are more subjective. The practical point is that if a treatment is proposed, the tests done before it determine whether anyone can say afterwards what changed.
Asking what baseline testing will be performed is therefore not a technicality. Without it, the only available measure of success is how you feel on the day you are asked.
Realistic expectations
Possible improvement in symptoms, on early trial evidence, with durability unknown.
No basis for expecting restored sensation in feet with long-standing severe numbness, and no trial reporting it.
If the cause is untreated, the progression continues regardless. Type 2 diabetes covers the underlying condition and what the evidence there looks like.
Where symptoms do settle, it is worth knowing whether that reflects nerve recovery or better pain modulation. They feel the same to the patient and mean different things for what happens next.
Questions worth asking
- What is the cause of my neuropathy, and has it been fully investigated?
- Is my glucose control where it should be?
- Could this be a compression problem with a surgical answer?
- Which trial supports the proposed treatment, and at what stage was it?
- How will effect be measured — sensation testing, or how I feel?
Adverse events covers documented harms, and the patient journey describes what assessment involves.
Frequently asked questions
Can damaged nerves regrow?
Peripheral nerves can, at roughly a millimetre a day, and only if the underlying cause stops. In diabetes, that means glucose control.
Is there a real trial?
A randomised phase 2a trial in diabetic peripheral neuropathy, which is early-stage work designed to decide whether to continue.
Why are testimonials unreliable here?
Neuropathic pain has one of the highest placebo response rates in medicine — often forty per cent or more in drug trials.
What if my neuropathy is not from diabetes?
Then the cause needs identifying. Chemotherapy, alcohol, B12 deficiency, thyroid and kidney disease all cause it, and some are treatable.
Will feeling come back in my feet?
No trial has reported restored sensation in long-standing severe numbness. That should not be presented as an expected outcome.
What about carpal tunnel?
That is a trapped nerve with a surgical answer. Treating it as a candidate for infusion is a diagnostic failure.
Requesting a medical evaluation
Nothing on this page establishes whether any treatment is appropriate for you. That needs your history, your imaging and your current medications read by a clinician. If you would like that review, send your records and we will tell you honestly whether there is anything worth discussing — including when the answer is no.
This page is general information, not medical advice, and does not create a doctor–patient relationship. Regenerative treatments discussed here are in most cases investigational. Discuss any treatment with a clinician who knows your history.