Is PRP hair treatment safe? The risks, the contraindications and the honest limits

For a healthy adult, PRP is one of the lower-risk procedures done in a hair clinic, because the material injected into your scalp is drawn from your own arm minutes earlier. That removes the two things patients ask about first, allergy and rejection, and leaves a shorter list of real risks: tenderness, swelling, bruising at the injection points and, rarely, an infection where a needle went in. What it is not is universally suitable. Certain blood conditions, certain medication and an active problem on the scalp are reasons to postpone or to decline, and those are decided at the consultation rather than at the appointment.

What it is

Your own blood, spun in a centrifuge so the platelet-rich fraction can be injected back into the scalp

Where the material comes from

A blood sample taken from your arm in the same appointment; nothing donated, nothing synthetic

The common effects

Tenderness for a day or two, some swelling, small bruises at the injection points

The uncommon risks

Infection at an injection site, and a sample that was poorly handled and therefore does nothing

What is not a risk

An allergic reaction to the material, or rejection of it, because it is yours

Price

From €150 per session, quoted on its own and not one of the items inside the transplant package

Number of sessions

A clinical decision based on your scalp and your response, not a fixed course sold in advance

Why allergy and rejection are not on the list

PRP is autologous, which is the medical word for coming from the same person it goes back into. Blood is drawn, spun so that the plasma carrying a high concentration of platelets separates from the red cells, and that fraction is injected into the scalp in the same visit. There is no donor material, no animal product and no manufactured active ingredient, so the immune reactions that make people nervous about injectables have nothing to react against.

That is a genuine safety advantage and it is worth stating precisely, because it is also the sentence that gets overstated into something else. Autologous does not mean consequence-free. Every needle that crosses skin carries a small risk of infection and a certain amount of discomfort, and a blood draw has its own small list, including the possibility of feeling faint. These are the risks of an injection procedure, which is what PRP is.

The risks that are real

Tenderness and swelling. The scalp is injected at many points, so it feels sore for a day or two, and some people get mild swelling on the forehead or around the eyes for a similar period. It settles on its own.

Bruising and pinpoint bleeding. Small bruises at the injection sites are common, more so in anyone whose blood clots slowly or who takes something that thins it.

Headache or a tight scalp. Reported for the first day by some patients and usually manageable with the simple painkiller you are told to use rather than the ones that thin blood.

Infection. Uncommon, and the reason sterile single-use kits and a clean field exist. Any warmth, spreading redness or pus after an injection appointment is something to report the same day rather than wait out.

A sample that does nothing. The quieter risk, and it is about quality control rather than harm. Blood that sits too long, is spun at the wrong settings or is handled in an open system can yield a preparation with little of what makes it worth injecting. The patient is not hurt; the session is simply wasted. This is why preparation and injection happen in one appointment, and why what is being spun matters more than the brand of the machine.

Who should not have PRP, and who needs a conversation first

Some of these are absolute, some are a matter of timing, and the distinction is the point.

• Platelet and clotting disorders, and low platelet counts: a treatment built on platelets does not make sense when the platelets are the problem. This is a no rather than a delay.
• Anticoagulants and daily aspirin: not an automatic refusal, but nothing is done until the doctor who prescribed the medication has had their say. Stopping a blood thinner for a cosmetic appointment is not a decision a hair clinic gets to make.
• Active infection or inflammation on the scalp: treated first, then reassessed. Injecting through infected skin spreads it.
• Blood-borne cancers and some cancer treatments: declined or deferred to your oncology team, without exception.
• Poorly controlled diabetes or uncontrolled high blood pressure: managed first, because healing and infection risk both follow control.
• Pregnancy and breastfeeding: elective scalp injections wait.

So list your conditions and your medication in your first message, because that is the part of the assessment that decides the answer. The same list, with what happens in each case, runs through health conditions and medication before surgery for the surgical side.

What PRP can and cannot do

This is where honesty is worth more than enthusiasm. PRP works on follicles that are still alive and producing hair, however thin that hair has become. It does not create follicles, so scalp that has been smooth for years is not a target for it: that is what surgery is for, and the techniques are set out on the PRP treatment page alongside where it fits.

Where it is used, it is used for three things. In early or moderate thinning, as support for hair that is miniaturising. Around a transplant, on the recipient and donor areas, with healing and the early growth phase in mind. And as maintenance for someone already stable who wants to keep what medication and surgery have achieved. Any improvement is gradual and it is measured in photographs over months, not felt in a week. It also holds only while it is kept up, which is why it belongs in a plan rather than being bought as a one-off.

What it does not do is replace the two things with the strongest evidence behind them. Medication protects native hair, and that conversation belongs with a doctor where you live: see finasteride and minoxidil. Surgery moves follicles that are not sensitive into areas that have gone. PRP sits alongside both and substitutes for neither.

How a course is decided, and what it costs

A session is from €150, and the reason no fixed number of sessions is published on this page is that a fixed number would be a sales figure rather than a clinical one. How many, how far apart and whether they are worth repeating depends on what your scalp shows at the start, what the photographs show later, and whether you are also on medication. The surgeon who will treat you decides that with you, and the honest version of the conversation includes the possibility that PRP is not what your case needs.

If you are having surgery, whether PRP is added and when is decided as part of your plan rather than sold at the door. What your recovery involves either way is on the aftercare instructions, and the complications specific to the operation itself are on risks and complications.

FAQ

Is PRP safe for hair loss?

For a healthy adult, yes, with the qualifications on this page. The injected material is your own, so allergy and rejection are not concerns, and the recognised effects are local and short-lived: soreness, swelling and small bruises. The uncommon risk is infection at an injection site, which is managed with sterile technique and treated quickly if it happens. It is not suitable for anyone with a platelet or clotting disorder, an active scalp infection or certain cancers, and it needs a prescriber’s input if you take a blood thinner.

Does PRP hurt?

It is uncomfortable rather than agonising, and it is over quickly. The blood draw feels like any other, and the scalp injections sting, most noticeably along the hairline. Tenderness for a day or two afterwards is normal, as is mild swelling. You are told which painkillers to use, and the reason it matters is that the ones which thin blood are not the right choice around this procedure.

Can I have PRP if I take aspirin or a blood thinner?

Not without input from the doctor who prescribed it. Aspirin and anticoagulants affect platelet behaviour and bleeding, which touches both the risk of bruising and the point of the treatment. Some patients proceed after that conversation, some are advised to leave it, and nobody at a hair clinic should be telling you to pause cardiac medication for a scalp appointment. Bring the prescription details to the consultation and the answer comes from the right place.

Is PRP safe soon after a hair transplant?

It is commonly used around surgery, but the timing is a clinical judgement rather than a rule you can read online. A newly grafted scalp is healing and is handled as little as possible in the first days, so anything added is scheduled to fit that, not the other way round. If PRP is part of your plan you will be given the date along with the rest of the aftercare, and if it is not part of your plan, nobody will add it at the last minute.

Will PRP regrow hair on a bald crown?

No. Once an area has been smooth for years the follicles are no longer there to stimulate, and no injection brings back what is gone. PRP is aimed at follicles that are still working but producing finer, weaker hair, which is why it suits early and moderate thinning and disappoints anyone expecting it to replace a transplant. If your photographs show a bald area rather than a thinning one, the useful conversation is a surgical one.

Clinically reviewed by the treating surgeon. Last reviewed 25 September 2026.