PRP After Hair Transplant: What the Evidence Really Shows

PRP (platelet-rich plasma) after a hair transplant may help grafts grow faster and survive better, but the evidence is thin. A 2025 systematic review found only three controlled studies with 217 people in total. All reported some benefit, but they used different methods, none used standardized measuring tools, and the authors called for better trials (Cureus, 2025). PRP is not FDA-cleared for hair growth; its use for hair is off-label (International Society of Hair Restoration Surgery).

What PRP is

PRP is made from your own blood. A small amount is drawn and spun in a centrifuge to separate the layers. The layer with concentrated platelets is collected. Platelets carry growth factors, proteins that signal tissues to heal and grow. The PRP is then injected into the scalp (ISHRS).

With a transplant, PRP is used in two main ways:

• During surgery: injected into the area where grafts are placed (Garg 2016), or added to the solution that holds grafts before they go in (Thuangtong 2023).
• After surgery: as a series of scalp injections in the months that follow, to support growth of both new and existing hair.

What the evidence shows

PRP added to a transplant

Sources: Garg 2016, Xue 2025, Sindhusen 2025.

A lab study tested whether adding PRP to the solution grafts sit in before placement helps them grow. Over 7 days, grafts stored with PRP did not grow differently from grafts without it, though one marker of follicle health was higher. Storage temperature and solution type mattered more (International Journal of Trichology, 2023).

PRP for hair loss in general

There is more research on PRP for male and female pattern hair loss without surgery, but it is also mixed. A 2023 meta-analysis of 9 randomized trials with 238 patients found that PRP increased hair density at 3 and 6 months compared with placebo. It did not significantly improve hair count or hair thickness compared with placebo. No serious side effects were reported (Journal of Cutaneous Medicine and Surgery, 2023). The ISHRS page on PRP, written by a hair surgeon, says plainly that some studies show benefit and others do not, and that some patients get no benefit at all (ISHRS).

Why results vary so much

• No standard recipe. There are dozens of ways to collect, spin and inject PRP, and no standard has been accepted (ISHRS).
• Platelet counts differ. Normal platelet levels vary about threefold between people, so some PRP has far more growth factors than others (ISHRS).
• Unknown mechanism. PRP contains at least six growth factors and about 30 other substances. Exactly how it affects hair is unknown (ISHRS).

What the evidence does not show

• It does not show that PRP is necessary. The studies are too small and too varied to say how much difference it makes for a typical patient.
• It does not show long-term benefit. The transplant studies followed patients for months, not years.
• It does not tell us the best timing, dose or number of sessions after a transplant.
• It does not show that PRP prevents shock loss. For what is known about shedding after surgery, see our article on hair transplant shock loss.

What a PRP session is like

The ISHRS page describes a typical visit (ISHRS):

1. You sign a consent form, and blood is drawn. The amount depends on the system the office uses.
2. The blood is spun once or twice. The goal is a platelet level 2 to 6 times higher than in normal blood, but there is no agreed ideal.
3. The scalp may be numbed. PRP is injected in tiny amounts, as little as 0.05 ml each, at up to about 120 spots.
4. Some offices add microneedling, and some add a stabilizer made from pig tissue. Ask about this if you avoid pork products for religious or personal reasons.

Who is most likely to benefit

For hair loss in general, the best candidates are people with thinning hair rather than complete baldness, and with more recent hair loss. People with naturally higher platelet counts may get more growth factors per treatment (ISHRS). Grafts in a bald area are a different situation, which is one reason transplant studies need to be judged on their own.

Safety, sessions and cost

PRP is considered very safe because it comes from your own blood. The main risk is temporary pain at the injection sites. Infection risk is low if the procedure is done cleanly (ISHRS).

For hair loss in general, PRP must be repeated to keep working, and there is no standard schedule. A common plan is one session a month for three months, then a booster every six months. The ISHRS page also advises avoiding anti-inflammatory painkillers such as ibuprofen and aspirin for up to 14 days after a session, as they may blunt the effect (ISHRS). Ask your surgeon how this fits with any medicines you take after a transplant.

In the U.S., PRP can cost from about $400 to $1,500 or more per session, according to the ISHRS page (ISHRS). For transplant prices, see our hair transplant cost guide.

Cheaper proven options come first

The author of the ISHRS PRP page, an experienced hair surgeon, says he uses PRP only after patients have tried minoxidil and finasteride, which can cost about $10 a month and have stronger evidence. He also warns that some providers push PRP as an easy profit, and advises caution if only expensive treatments are offered (ISHRS).

The bottom line

PRP is low-risk and may give a modest boost, especially in the first months after surgery. But the transplant studies are small, short and not standardized, and results for hair loss in general are mixed. If it is included at little or no extra cost, there is little downside for most people. If it adds a large cost, the evidence does not clearly justify it. Either way, it does not replace good surgery or proven medicines.

PRP in transplant packages abroad

If a clinic abroad includes PRP in the package, that can be a reasonable extra, but it should not drive your choice of clinic. The surgeon's skill and the care of your grafts matter far more. Ask:

1. When is PRP given: during surgery, after, or both?
2. How is it prepared? Single or double spin, and do you measure the platelet count?
3. If I need more sessions after I go home, who will give them, and with what system?
4. Is the PRP included in the price, or does it replace something else, such as follow-up care?

Our questions to ask a hair transplant clinic list covers the bigger picture, and our hair transplant recovery timeline explains what is normal month by month.

Related reading: Finasteride After Hair Transplant: Benefits, Risks, FDA Label, Hair Transplant for Women: Who Qualifies and What to Expect.