PRP for hair loss: does platelet-rich plasma work?

How PRP works

A small amount of your blood is drawn and spun in a centrifuge to concentrate the platelets. That platelet-rich plasma is then injected into thinning areas of the scalp. Platelets release growth factors, and the theory is that these can prolong the growth phase of follicles and improve hair thickness.

What studies show

Many small trials and several reviews report improvements in hair density and thickness in androgenetic alopecia, but results vary widely between studies (PubMed reviews). One reason is that there's no standard protocol: preparation methods, platelet concentration, number of sessions and injection technique differ from clinic to clinic. PRP isn't a cure, and benefits usually need maintenance sessions.

Who may benefit

• People with early to moderate thinning, where follicles are still present
• People looking for an option alongside medical treatment
• Some surgeons use it around hair transplant surgery, though evidence for that use is still developing

PRP doesn't regrow hair on areas that have been bald for a long time, and it's not suitable for people with certain blood disorders or on some medications.

What treatment looks like

Protocols commonly involve an initial series of sessions about a month apart, followed by maintenance every several months. Expect mild soreness, redness or swelling for a day or two. Infection and other complications are uncommon but possible, so choose a licensed medical provider.

Questions to ask a provider

• How is the PRP prepared, and what platelet concentration do you aim for?
• How many sessions, and what does maintenance cost?
• How will we measure results (standardized photos, trichoscopy)?
• Do you recommend combining PRP with medical treatment?

Compare other approaches in our guide to hair restoration options, or find a specialist.

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