Platelet-Rich Plasma (PRP) for Hair Restoration
What is Platelet-Rich Plasma (PRP) for hair loss?
PRP (platelet-rich plasma) is a clinic-based treatment. It involves drawing a small amount of blood, processing it in a centrifuge to concentrate the platelets, and injecting the resulting plasma into the scalp. Platelets contain growth factors that may stimulate hair follicle activity. PRP is not FDA-approved for hair loss. It is a medical procedure performed in a clinic by a trained practitioner. Results depend significantly on preparation protocol and technique, which vary substantially between clinics.
Does Platelet-Rich Plasma (PRP) work for hair loss?
Who it applies to
- Adults with pattern hair loss (androgenetic alopecia)
- Both men and women (trials included both)
- Clinic-based procedure only
Who it does not apply to
- People with alopecia areata (evidence is unclear for immune-related hair loss)
- People seeking a home treatment
- People unable to access a clinic offering PRP
What to look for when buying
Every spec brands use in marketing — and what the research actually says.
| What brands market | Research verdict | What to look for |
|---|---|---|
| Activated vs non-activated PRP | ✅ Matters | Anitua 2025 found activated PRP significantly outperformed non-activated and was associated with fewer adverse effects. |
| PRP vs placebo | ✅ Matters | Significant hair density increase vs placebo at 3 and 6 months across 9 RCTs (Zhang 2023). |
| PRP vs topical minoxidil | ⚠️ Unclear | A 2025 meta-analysis of 9 RCTs (451 patients) found no significant difference in hair density between PRP and topical minoxidil. |
| Preparation protocol | ⚠️ Unclear | No standardised protocol exists. Centrifuge speed, activation method, and injection technique vary between clinics and affect outcomes. |
| Evidence for alopecia areata | ⚠️ Unclear | Cruciani 2023 found evidence for alopecia areata was inconsistent. PRP is primarily evidenced for pattern hair loss. |
| FDA approval | ❌ Not researched | PRP is not FDA-approved for hair loss. |
What research cannot tell you
These questions are not answered by any qualified study in our database.
- Which specific preparation protocol produces the best results
- How long results last after a course of treatment
- How many sessions are needed and at what interval
- Whether PRP is more or less effective than minoxidil for your specific situation
- Whether combining PRP with minoxidil or other treatments adds further benefit
Research behind this page
All studies are independent systematic reviews or meta-analyses.
| Study | Score | Finding |
|---|---|---|
| PRP across 43 RCTs — 1,877 patients | 6/10 | Activated PRP significantly increased hair density and minimised recurrence vs placebo; non-activated PRP associated with more adverse effects |
| PRP for pattern hair loss — 9 RCTs | 6/10 | Significant hair density increase vs placebo at 3 and 6 months; high heterogeneity due to different protocols |
| PRP vs topical minoxidil — 9 RCTs | 5/10 | No significant difference in hair density between PRP and topical minoxidil across 451 patients |
| PRP for alopecia — 27 studies | 5/10 | Positive for pattern hair loss; unclear for alopecia areata; mostly low-quality evidence |
What the research says about common buyer questions
Is PRP as good as minoxidil?+
Based on the available evidence, results are similar. A 2025 meta-analysis of 9 head-to-head trials found no significant difference in hair density between PRP and topical minoxidil. PRP requires clinic visits and injections; minoxidil is an OTC daily home application. The choice depends on preference, access, and cost rather than evidence of superiority.
How many sessions do I need?+
Research cannot give a definitive answer. Trials have used varying numbers of sessions and intervals. Most positive studies used 3-4 sessions spaced 4-6 weeks apart. There is no standardised protocol supported by comparative evidence.
Does it matter which clinic I use?+
Yes, significantly. PRP preparation protocol (centrifuge settings, activation method) and technique vary substantially between clinics and affect outcomes. No standardised protocol exists. The variability across trials in the research reflects this real-world variation.
Does it work for patchy hair loss (alopecia areata)?+
Evidence is unclear. The 2023 Cruciani review found inconsistent results for alopecia areata. PRP is primarily evidenced for pattern hair loss caused by genetics and hormones, not for immune-related hair loss.