Long COVID: cell-therapy evidence by therapy class
Across every stem-cell intervention, ClinicalTrials.gov holds 10 registered records for Long COVID — 2 recruiting, 1 at Phase 3 or 4, in 2 countries. Snapshot 2026-08-29.
The condition, and why cells are proposed
Long COVID is a heterogeneous post-viral syndrome spanning autonomic dysfunction, exercise intolerance and cognitive symptoms, with no accepted biomarker. Cell rationales target persistent inflammation and endothelial dysfunction. Heterogeneity is the central research problem: several distinct conditions are probably being studied under one label.
Therapy classes side by side
| Therapy class | Registered | Recruiting | Phase 3/4 | Countries |
|---|---|---|---|---|
| MSC | 8 | 1 | 0 | 2 |
| HSCT | 0 | 0 | 0 | 0 |
| exosomes | 1 | 0 | 0 | 1 |
| PRP | 0 | 0 | 0 | 0 |
Counts come from separate registry queries per class; a study testing two interventions can appear in more than one row, so rows do not sum to the all-interventions total.
Geography of the research
United States accounts for about 62% of country mentions among sampled studies; 2 countries host at least one site.
| Country | Studies with a site there |
|---|---|
| United States | 5 |
| China | 3 |
The largest registered studies
Sorted by planned enrolment — size is not quality, but a 300-participant trial can answer questions a 12-participant series cannot.
| Study | Phase | Status | Planned n | Lead sponsor | Start |
|---|---|---|---|---|---|
| NCT06441955 — Covid-19 Long Haul Preventative and Health Promotion Care Clinical Trial Acceleration Program. | Phase 4 | Recruiting | 100 | Well- Konnect Healthcare Services and Research Firm | 2024-03-01 |
| NCT05808400 — Safety and Efficacy of Umbilical Cord Mesenchymal Stem Cell Exosomes in Treating Chronic Cough After COVID-19 | Early Phase 1 | Unknown | 80 | Huazhong University of Science and Technology | 2023-02-15 |
| NCT05126563 — Randomized Double-Blind Phase 2 Study of Allogeneic HB-adMSCs for the Treatment of Chronic Post-COVID-19 Syndrome | Phase 2 | Completed | 79 | Hope Biosciences Research Foundation | 2022-02-02 |
| NCT06492798 — Effectiveness and Safety of Mesenchymal Stem Cell Therapy in Long COVID Patients | Phase 1, Phase 2 | Recruiting | 76 | Changhai Hospital | 2023-09-01 |
| NCT05669261 — Treatment of Long COVID Symptoms Utilizing Autologous Stem Cells Following COVID-19 Infection | Phase 1 | Unknown | 20 | American CryoStem Corporation | 2023-08-01 |
| NCT06156241 — Stem Cell Study for Long COVID-19 Neurological Symptoms | Phase 1 | Unknown | 12 | Charles Cox | 2024-01 |
Most recently registered
| Study | Phase | Status | Planned n | Lead sponsor | Start |
|---|---|---|---|---|---|
| NCT05116761 — ExoFlo™ Infusion for Post-Acute COVID-19 and Chronic Post-COVID-19 Syndrome | n/a | Withdrawn | n/a | Direct Biologics, LLC | 2024-11 |
| NCT06441955 — Covid-19 Long Haul Preventative and Health Promotion Care Clinical Trial Acceleration Program. | n/a | Recruiting | n/a | Well- Konnect Healthcare Services and Research Firm | 2024-03-01 |
| NCT06156241 — Stem Cell Study for Long COVID-19 Neurological Symptoms | n/a | Unknown | n/a | Charles Cox | 2024-01 |
| NCT06492798 — Effectiveness and Safety of Mesenchymal Stem Cell Therapy in Long COVID Patients | n/a | Recruiting | n/a | Changhai Hospital | 2023-09-01 |
| NCT05669261 — Treatment of Long COVID Symptoms Utilizing Autologous Stem Cells Following COVID-19 Infection | n/a | Unknown | n/a | American CryoStem Corporation | 2023-08-01 |
Reading this honestly
A registry is a plan repository. Counting entries tells you what people intended to study, which is a weaker thing than what they found. For Long COVID specifically, the practical question is which registered study — if any — matches the product a provider is offering, and what its outcome measures actually are.
Frequently asked
How many stem-cell trials exist for Long COVID?
10 registered records mention a stem-cell intervention for this condition (2026-08-29 snapshot), of which 2 were recruiting.
Which therapy class is furthest along for Long COVID?
Ranked by Phase 3/4 records: MSC (0), HSCT (0), exosomes (0), PRP (0).
Does a recruiting trial mean I can be treated?
No. Trials have eligibility criteria, and joining one is not the same as buying a treatment. Paying a clinic for an unproven intervention outside a registered study gives you neither the protections nor the data collection of a trial.
Registry and literature counts retrieved 2026-08-29 (ClinicalTrials.gov API v2; PubMed E-utilities). Registration or publication volume measures research activity, not effectiveness or approval. Educational information — not medical advice; verify product, indication, legal pathway and evidence with an independent qualified physician. Page generated 2026-08-29. See our editorial standards.
Download the query data
Query totals are full API matches; status, phase and country counts describe the first up to 400 returned records per query. Query classes overlap and must not be summed as unique trials. Counts are not treatment outcomes. Snapshot: 2026-08-29. Methods and field definitions.