PRP for hair, explained before anyone sells it to you

Platelet-rich plasma, everywhere it is sold for hair, is the same three steps: a clinician draws a tube of your blood, spins it in a centrifuge so the platelet-heavy fraction separates, and injects that fraction across the thinning areas of your scalp. It is a course of injections rather than a one-off, it is sold almost entirely as a cash procedure, and the fairest reading of the research is that it may help hair density — with the certainty of that “may” graded low to very low by the people who pooled the trials. This page walks through the procedure, the schedule, the money and the evidence, in that order; it links to no clinic and recommends none.

What happens in a session

A PRP appointment is short — the blood draw is the same as a lab test, the spin takes minutes, and the injections are a grid of small, shallow scalp punctures across the treatment area, often after a numbing cream or local anaesthetic — an ordinary outpatient appointment, not a theatre procedure. What varies enormously — and matters — is everything around that outline: how the blood is spun, what concentration results, how much is injected and how deep. The pooled analysis flagged exactly this, noting “heterogeneity in PRP preparation methods” as a significant limitation of the evidence. Two clinics saying “PRP” are not necessarily selling the same syringe.

The schedule clinics sell

PRP is marketed as a course: several starting sessions close together, then top-ups for as long as you want to keep the effect. The published cost model by Klifto and colleagues (Cureus, December 2021) — built for exactly this question — priced a protocol of “three office visits (0, 4, and 8 weeks), followed by every six months.” That shape, a three-visit induction and twice-yearly maintenance, is the version of PRP most US clinics quote, and it is the number to hold in your head when a consultation mentions a per-session price: you are not buying one session. PRP offered as an add-on to a hair transplant is a separate purchase, and it gets its own page here.

What it costs, from published figures

The same Klifto model put “the average costs of single PRP injections” at $717.67 in 2020 US dollars, drawn from Medicare reimbursement schedules and published studies. Multiply the protocol out yourself: three starting sessions at that average is about $2,150 before maintenance, and two maintenance sessions a year adds roughly $1,435 every year after — which is why the model's long-run totals for PRP land around nine times higher than staying on a pharmacy topical. Real clinic quotes range widely around that average by city and by preparation; the session-by-session cost reading does the arithmetic in full. Treat any quote far below the published average as a question to ask, not a bargain to grab.

What the evidence says, with its certainty grade

The most useful recent summary is Yao et al. (PLoS One, August 2024), a meta-analysis of five randomized trials comparing PRP added to topical minoxidil against the topical alone. It found hair density meaningfully better with PRP — about 17.8 more hairs per cm² at five to six months — and then did the honest thing marketing never does: it graded its own certainty.

“Very low-quality evidence shows that the addition of injectable PRP to topical Minoxidil may improve outcomes in patients with androgenetic alopecia.” — Yao et al., PLoS One, 28 August 2024

Three of the five trials carried a high risk of bias, the preparations differed, and the follow-ups were short. None of that means PRP does nothing; it means nobody can honestly tell you the odds it works for you — which is precisely the number a clinic consultation will imply it knows. Our reading on PRP success rates unpacks what the trials measured instead of a success rate.

Side effects and who should be asking harder questions

Within the pooled trials, adverse events were comparable between the PRP and control groups — soreness and the ordinary consequences of scalp injections, with no signal beyond them in these small, short studies. That is reassurance with narrow edges: it says little about bleeding disorders, platelet conditions, medications, scalp disease or infection control at a specific clinic. PRP uses your own blood, which removes one class of risk and leaves every risk that belongs to needles and technique. A clinician who has actually examined you — and knows your medications and history — is the only person who can sort those for your case.

How to deal with clinics (without a recommendation from us)

We do not link, rank or vet PRP providers, so this is the section a sales page would never print. Before paying anyone, get answers in writing:

1. Who performs the injections — the clinician you met, or someone else — and what their qualification is.
2. What preparation system is used, what the platelet concentration typically is, and how much volume is injected per session.
3. The all-in price of the full first year: induction sessions, maintenance sessions, numbing, consultation fees.
4. What their own stopping rule is — at how many months, measured how, do they advise a patient the treatment isn't working?
5. Whether your hair loss has actually been diagnosed as androgenetic alopecia, and what else was ruled out, before any needle is discussed.

Compare at least two quotes against the published $718-per-injection average, and treat pressure to prepay a long package at the first consultation as a red flag with feet. If a clinic also pitches “exosomes” or “stem cells” alongside PRP, read the FDA's exosome warning before going back.

PRP against the alternatives

PRP occupies an odd middle: more invasive and more expensive than anything on the laser cap page, less evidenced than the approved drugs a prescriber can offer. The trials that flatter PRP mostly test it added to a topical, not instead of one — the same pattern as microneedling, where the needle's job is to make a drug work harder. If your budget forces a choice, that ordering is worth sitting with: the cheapest tier has the strongest evidence, and it comes from a pharmacy.