Platelet-rich plasma (PRP) is prepared by centrifuging a sample of the patient's own blood to concentrate platelets and growth factors, which are then injected into the scalp.
Evidence Base
Systematic reviews and meta-analyses show PRP can increase hair thickness and density, particularly in female pattern androgenetic alopecia. However, protocols (preparation method, session frequency, platelet concentration) vary widely between clinics, which makes outcomes inconsistent.
Combination Therapies
Combining PRP with low-level laser therapy (LLLT) or topical minoxidil has been shown to produce greater density improvement than PRP alone.
Role in Hair Transplantation
PRP is not a stand-alone alternative to transplant surgery — it cannot replace follicles that are already gone. Some surgeons apply it during or after a transplant to support graft viability and speed healing.