Does PRP work for hair loss?

PRP for hair has a real signal of benefit in pattern hair loss, but the evidence is much weaker than the marketing suggests. A 2024 meta-analysis that pooled 13 randomized trials found an average difference in favor of PRP of about 27.55 hairs/cm² compared with control, but the variation between studies was very high (I²=95.99%) and the authors rated the evidence as low quality with signs of publication bias. So Dr. Yousef treats PRP as a possible add-on for pattern hair loss, not a guaranteed substitute for diagnosis or the right core treatments.

Key numbers

  • 431 patients — Patients in the review
  • +27.55 hairs/cm² — Difference in hair density
  • Very high (I² = 95.99%) — Variation between studies
  • Low — Quality of evidence

Who is most likely to benefit?

  • The best data are in pattern hair loss, not every type of shedding.
  • If the cause is acute telogen effluvium, iron deficiency or a thyroid problem, PRP does not treat the underlying cause.
  • Very advanced loss with clear follicle loss may respond less than a stage where miniaturized follicles remain.
  • Large differences in how PRP is prepared, platelet counts, centrifugation and sessions make a single universal protocol hard to give.

Does it also thicken each hair?

In the same meta-analysis, the average difference in hair diameter was 2.02 micrometers, but the confidence interval included no meaningful difference (-0.85 to 4.88 micrometers). So the strongest current signal is for density rather than a proven, consistent increase in thickness.

Key takeaways

  • PRP is not a myth, but it is not a guaranteed treatment; the evidence points to more density with low-quality evidence.
  • The pooled average of +27.55 hairs/cm² does not mean every patient will gain that number.
  • Diagnose the type of hair loss first, then decide whether PRP is worth adding.

PRP for Hair Loss: Does It Help, and for Whom?

Medical references