PRP vs Stem Cell Therapy: Which Is Right for You?
This comparison rarely appears on clinic websites, because for several common conditions it does not favour the more expensive option.
What each one is
PRP (platelet-rich plasma). Your blood is drawn, spun in a centrifuge, and the platelet-rich fraction is injected. Platelets contain growth factors. No stem cells are involved. The whole process takes under an hour.
Stem cell therapy. Mesenchymal stromal cells from bone marrow, fat, or donated cord tissue, injected or infused. Requires a harvest procedure or a purchased donor product.
Side by side
| PRP | Stem cell injection | |
|---|---|---|
| Source | Your own blood | Bone marrow, fat, or donor cord tissue |
| Procedure | Blood draw, ~45 minutes | Harvest surgery or donor product |
| Typical cost | $500–$2,000 per session | $5,000–$25,000 |
| Evidence for knee OA | Moderate — multiple RCTs, meta-analyses | Low certainty, mostly placebo-attributable |
| Evidence for tendinopathy | Reasonable for some tendons | Limited |
| Evidence for hair loss | Best in its category | Preliminary |
| FDA approved | No — but device-based, less regulatory exposure | No |
| Repeat sessions | Common and affordable | Rarely affordable |
| Risk | Very low | Low but higher; harvest and contamination risks |
The honest comparison
For knee osteoarthritis, PRP has been studied in more randomised trials than stem cell injection, and meta-analyses generally support modest improvements in pain and function against placebo or hyaluronic acid. Stem cell injection has less certain evidence, with the best available meta-analysis attributing most measured benefit to contextual effects.
PRP costs roughly a tenth as much.
For tendinopathy — tennis elbow, patellar tendinopathy — PRP has reasonable evidence for some tendons and disappointing results for others. Stem cell therapy has little controlled evidence here at all.
For hair loss, PRP is the best-evidenced injectable option, and much of what is sold as "stem cell hair restoration" is in fact PRP.
For acute muscle and ligament injury, evidence for both is weak.
What this means practically
If a clinic offers you both and steers you firmly toward the more expensive one, it is worth asking why — specifically, what evidence supports that recommendation for your condition. For several common indications, the cheaper option is the better-evidenced one.
The caveat that cuts both ways
PRP preparations vary enormously. Platelet concentration, leukocyte content, activation method and injection protocol all differ between clinics, and trials use different preparations — which is part of why results are inconsistent across studies. "PRP" is a category, not a standardised product.
The same criticism applies to stem cell treatment, more severely.
A sensible sequence for knee osteoarthritis
- Exercise therapy and weight management — first-line in every guideline
- Corticosteroid injection — cheap, covered, effective short-term
- PRP or hyaluronic acid — moderate evidence, moderate cost
- Stem cell injection — optional, unproven, expensive
- Joint replacement when justified
Most people arrive at step four having skipped steps one and two. That is the most common and most costly mistake in this field.
What about combining them?
Some clinics offer PRP alongside stem cell treatment, sometimes as a "booster." There is no reliable evidence that the combination outperforms either alone for the conditions typically treated. It does reliably increase the price.
Sources
- Systematic reviews and meta-analyses of platelet-rich plasma for knee osteoarthritis and androgenetic alopecia.
- Contextual effects of mesenchymal stem cell injections for knee osteoarthritis: systematic review and meta-analysis of RCTs. Frontiers in Medicine, 2025.
- American Academy of Orthopaedic Surgeons — clinical practice guideline on management of knee osteoarthritis.
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Medical disclaimer
This article is for general information and is not medical advice. We are not a healthcare provider and do not diagnose or treat any condition. Most stem cell treatments discussed here are not FDA approved for these uses, outcomes vary, and no result is guaranteed. Always speak with a licensed physician who knows your history. See our medical disclaimer and how we make money.