PRP or Medical Treatment for Hair Loss? What the Evidence Actually Shows

In short: the real difference between these two options is not how well they work — it is how much evidence exists behind each, and how good that evidence is. The trial programme behind oral medical therapy for male pattern hair loss enrolled 1,553 men across two randomised, double-blind, placebo-controlled studies, with 1,215 continuing into a second year. The most methodologically rigorous systematic review of PRP in male androgenetic alopecia, published in 2024, found nine studies in total, 291 participants combined, and rated the quality of the evidence as low. PRP is also not a registered medicine for hair loss anywhere — it is a procedure, which is why its protocol is not standardised between clinics. None of that means PRP does not work. It means there is not yet evidence strong enough to put it in place of first-line treatment, and it means you should know who wrote the answer you are reading.

If you have searched in English for whether PRP works for hair loss, you have almost certainly landed on one of two kinds of page: a clinic that performs PRP, or a content site that refers people to clinics that perform PRP. Both will tell you yes. Neither will tell you how many men have been studied in total.

That is not dishonesty. It is just that neither is a neutral party to the question. Here is the same question, the way a clinician looks at it.

What is PRP, and how is it meant to work?

PRP — platelet-rich plasma — is a procedure in which your blood is drawn, spun in a centrifuge to separate a plasma fraction with a high platelet concentration, and injected back into the scalp. The rationale is that platelets release growth factors that may support follicle activity and extend the growth phase of the hair cycle.

Note what that description does not include. PRP does not act on the hormonal mechanism that causes male pattern hair loss in the first place. Androgenetic alopecia is driven by an inherited follicular sensitivity to DHT, which causes progressive miniaturisation — each growth cycle produces a finer, shorter hair than the last. Evidence-based medical therapy targets that process directly: the oral route reduces DHT production, and the topical route acts on the follicle's growth cycle. PRP attempts to support the follicle without changing what is thinning it.

That is why almost everyone who works seriously in this area — including some of the clinics that sell it — presents PRP as an adjunct rather than a replacement.

How many men have actually been studied in each?

This is the question that separates the two, and it is one you can answer with numbers.

	Oral medical therapy	Topical medical therapy	PRP
Principal evidence base	1,553 men across two 1-year trials; 1,215 continued into year two	393 men in a 48-week multicentre trial	9 studies in total, 291 participants combined
Study design	Randomised, double-blind, placebo-controlled	Randomised, double-blind, placebo-controlled	8 randomised trials plus 1 prospective cohort
Assessed evidence quality	High	High	Rated low; 7 of 9 at moderate risk of bias
Protocol standardisation	Fixed, defined dose	Fixed, defined concentration	Not standardised — spin time, platelet concentration and session count vary between clinics
Regulatory status	Registered prescription medicine	Registered preparation	A procedure. Not a registered medicine for hair loss
Ongoing use required	Yes — stopping resumes the process	Yes	Yes — maintenance sessions
Source	PubMed 9777765	PubMed 12196747	PubMed 38284294 · 32295047

That gap is not a nuance. A single trial programme for oral therapy studied more than five times as many men as the entire randomised literature on PRP for male pattern hair loss combined.

So why does everyone quote "84% of studies showed improvement"?

Because it is true, and because it does not mean what it sounds like.

That figure comes from a 2020 systematic review of PRP in androgenetic alopecia (PubMed 32295047). It is worth reading in full. Of 163 articles initially identified, only 12 clinical trials met the criteria for analysis. Of those, 84% reported a positive effect — but only 50% demonstrated a statistically significant improvement using objective measures, and 34% reported improvements in hair density and thickness with no p value or statistical analysis described at all.

In other words, roughly a third of the studies counted inside that 84% reported an improvement without showing it was not chance. That is not fraud or spin — it is simply a young and inconsistent research literature. But quoting one number out of it gives a very different impression from the one the review itself describes.

The more recent and more rigorous 2024 systematic review restricted itself to randomised trials and prospective cohort studies in men. It found eight randomised trials and one cohort study, 291 participants in total; six reported a statistically significant increase in hair density; and seven of the nine were judged to be at moderate risk of bias. Its conclusion was that PRP demonstrated some therapeutic potential, but that the low quality of evidence, moderate risk of bias and high heterogeneity between studies limit the inferences that can be drawn (PubMed 38284294).

Can PRP replace medical treatment?

On the current evidence, there is no basis for replacement. There is a reasonable basis for combination.

The clinical logic is simple. Medical therapy targets the mechanism driving the hair loss; PRP attempts to support the follicles that are already there. If you stop the treatment that targets the mechanism, the mechanism carries on — regardless of how many PRP sessions you have had. It is the same point that explains why most men continue medical therapy after a hair transplant.

There is also a practical consideration. PRP protocols are not standardised: spin time, number of spins, final platelet concentration, whether the plasma is activated, and how many sessions are given all vary from clinic to clinic. So even where a particular study reported a good result, the protocol you are offered may not be the protocol that was studied. With a registered medicine, the dose and concentration are the same everywhere.

Who might PRP suit?

The group for which the evidence is least weak is men with early-to-moderate loss who still have active follicles in the treated area, and as an addition to medical therapy rather than instead of it. In an area that is already completely smooth — where the follicles are no longer active — PRP has nothing to act on, exactly as medical therapy does not.

One more consideration. PRP is a relatively invasive treatment requiring in-person visits, a series of sessions and ongoing maintenance. Some men prefer that to taking a daily medicine, and that is a legitimate preference worth raising with a clinician. But it should be presented as a preference, not as an upgrade.

What should you ask a clinic offering PRP?

• The exact protocol — how many sessions, at what interval, and what maintenance is expected afterwards.
• Whether standardised photography or density measurement is done before and after, and under what conditions — or whether assessment will be by impression alone.
• What they recommend regarding concurrent medical therapy, and if the recommendation is against it, on what basis.
• Whether anyone has confirmed that your hair loss is in fact androgenetic and not something else requiring investigation.

That last question matters more than it sounds. Hair loss can have non-hereditary causes, some of which need medical investigation before any treatment is started — cosmetic or pharmacological.

Frequently asked questions

Does PRP replace medical treatment for hair loss?

Not on the current evidence. Systematic reviews present PRP as a treatment with potential, primarily as an adjunct. Medical therapy is what targets the hormonal mechanism causing the loss, so stopping it allows the process to resume regardless of any PRP received.

What does "low quality of evidence" actually mean?

It is a technical grading, not an insult. It means the available studies are small, methodologically different from one another, and some are at risk of bias — so firm conclusions cannot be drawn from them. It does not mean the treatment does not work; it means how much it works, and for whom, is not yet established.

Is PRP safe?

The plasma comes from your own blood, so the risk of an allergic reaction is low, and the systematic reviews report no major adverse effects. As with any injection, local pain, redness and swelling are possible. It remains a medical procedure and should be performed in an appropriate setting.

How long does it take to see a change from PRP?

This varies considerably between individuals and between protocols, so there is no single figure worth quoting. Even across the published studies, measurement points and follow-up durations differ. That inconsistency is one of the reasons comparing PRP studies is so difficult.

Is PRP covered by the health funds in Israel?

PRP for hair loss is offered privately in Israel, generally in an aesthetic setting. Check directly with your kupat holim what is covered and under what conditions, rather than relying on what a provider's own website says.

If I am already on medical treatment, is there any point adding PRP?

That is a question for a clinician, because the answer depends on the stage of loss, how fast it is progressing and what has been achieved so far. The logic of adding it exists; the size of the benefit is precisely what the current evidence does not yet quantify well.

The bottom line

There is no winner and loser here. There is a difference in how mature the evidence is. Medical therapy has been tested in thousands of men in randomised, placebo-controlled trials, at a defined dose, as a registered medicine. PRP has been tested in 291 participants in total, in studies graded as low quality, using a protocol that is not standardised, without registration as a treatment for hair loss.

That is a good reason to start from the stronger evidence base and consider adding to it later — not the other way round. And either way the decision is a clinical one rather than a consumer one: it depends on your stage of loss, how fast it is progressing, and confidence that the loss is androgenetic and not something else.

Medical disclaimer: The information on this page is general medical information and is not personal medical advice, a diagnosis, or a recommendation to undergo any treatment. Suitability varies between individuals and is determined by a clinician after assessment. Prescription medicines in Israel require evaluation by a licensed physician. Do not start, change or stop any treatment on the basis of this content.

Sources: Kaufman KD et al. Finasteride in the treatment of men with androgenetic alopecia. J Am Acad Dermatol 1998;39(4 Pt 1):578-89 — PubMed 9777765 · Olsen EA et al. A randomized clinical trial of 5% topical minoxidil versus 2% topical minoxidil and placebo in the treatment of androgenetic alopecia in men. J Am Acad Dermatol 2002;47(3):377-85 — PubMed 12196747 · Donnelly C et al. The role of platelet-rich plasma in androgenetic alopecia: A systematic review. J Cosmet Dermatol 2024;23(5):1551-9 — PubMed 38284294 · Gentile P, Garcovich S. Systematic Review of Platelet-Rich Plasma Use in Androgenetic Alopecia Compared with Minoxidil, Finasteride, and Adult Stem Cell-Based Therapy. Int J Mol Sci 2020;21(8):2702 — PubMed 32295047