How Many PRP Sessions for Hair Loss? What Trials Used and When to Judge Results

There is no single number of PRP sessions that suits everyone with hair loss. Published trials of platelet-rich plasma (PRP) for pattern hair loss used anything from 1 to 6 sessions, and they differed in how the PRP was prepared, how often it was injected and how long people were followed. That is why clinic pages quote different courses. Treat any quoted number as a proposed plan for you to ask about, not a proven requirement.

This guide sets out what the research reports, why results take months to judge, and what to ask before you agree to a course. It does not diagnose your hair loss and cannot tell you how many sessions you would need.

What have published trials actually used?

Reviews of PRP for androgenetic (pattern) hair loss describe a wide range of protocols:

Source	What it reports	What to take from it
Dervishi et al., 2020 systematic review (as summarised by American Family Physician)	13 randomised trials, 343 people. Protocols of 2 to 5 injections over 2 months, with 3 to 6 months of follow-up.	Trials were short. Results at 3 to 6 months do not show what happens later.
Evans et al., 2020 meta-analysis (as summarised by American Family Physician)	30 studies, 687 people. 1 to 6 sessions, followed for up to 6 months.	The session count differed between studies.
Zhang et al., 2023 meta-analysis of randomised trials	9 trials, 238 people. Hair density was higher with PRP than with placebo at 3 and 6 months. Hair count and diameter did not differ significantly from placebo.	Findings were mixed across measures.

American Family Physician notes that the studies varied in how PRP was prepared, how often and how it was injected, and how long people were followed, and that these differences could affect the results. One pooled analysis it describes found heterogeneity (the degree to which studies disagree) of I² = 100% for hair density, which means the studies differed a great deal. The same summary describes a network meta-analysis in which the estimate for PRP against low-level laser therapy crossed zero and the authors rated the evidence low quality, making no recommendation for or against PRP.

In short: trials point to some improvement in hair density over months for some people with pattern hair loss, but they do not establish an ideal number of sessions, an ideal interval or how long any effect lasts.

Why do clinic pages quote different courses?

Clinic websites often describe a starting course of about three or four sessions a few weeks apart, followed by "maintenance". When we compared several pages, the details did not agree: maintenance was described anywhere from every 3 months to every 12 months, and most pages gave no source for their figures. A clinic's usual schedule may reflect its own method and experience, which is a reasonable thing for a practitioner to explain, but it is different from a trial-proven requirement.

Useful questions when you see a number:

• Is this the clinic's usual plan, or what a published study used?
• Does it apply to my type of hair loss and how far it has progressed?
• What is the plan if I respond little or not at all?

When can results fairly be judged?

Hair grows slowly, so any hair treatment takes months to judge. The British Association of Dermatologists says 5% minoxidil should be used for at least 6 months and possibly up to 12 months before any benefit may be noted, and that oral finasteride can need continuous use for up to 14 months. PRP trials mostly followed people for 3 to 6 months. A early check at a few months is therefore a progress check, and not the final verdict.

Ask the practitioner how they will measure change (for example, dated photographs taken in the same lighting and hair position) so you are not relying on memory.

Who is PRP evidence about, and who needs assessment first?

The trials above concern androgenetic (pattern) hair loss. Other causes of hair loss, including temporary shedding, scarring conditions and thyroid or iron problems, need their own assessment. The NHS advises seeing a GP if you are worried about hair loss and before thinking about going to a commercial hair clinic. Our guide to hair shedding versus pattern hair loss explains why the type of hair loss matters.

PRP is also not the only option. The BAD leaflet on male pattern hair loss lists topical minoxidil, oral finasteride and other treatments alongside PRP, and notes that PRP is not offered under the NHS but can be sought privately. The NHS says no treatment is 100% effective.

What to ask before agreeing to a course

1. Which type of hair loss is being treated, and how was it assessed?
2. How many sessions are proposed, how far apart, and why?
3. What is included in the course price? Ask whether follow-up reviews and any later top-up sessions are separate. Check the current fees on the Progen prices page.
4. How will we judge whether it is working, and when? Agree a review point in advance.
5. What happens if there is little change? Ask about stopping or alternatives, not only more sessions.
6. Should I tell you about medicines or health conditions? Blood thinners, aspirin and ibuprofen are a common example; see what to tell the clinic before PRP hair treatment.

Next step

If you are considering PRP in Bournemouth, you can read the PRP hair loss treatment information and book a consultation there, or contact the clinic with general questions. Your practitioner will confirm the number of sessions, timing and suitability for you after assessment. A proposed plan is not a promise of results.

Frequently asked questions

Can PRP work after just one session?

Published trials mostly used several sessions, and almost none was designed around a single injection. Whether one session is enough for you is something the practitioner can only judge after assessment; a single session should not be assumed to be a full course.

Is a maintenance session always needed?

Clinic pages disagree about how often, and published trials were too short to settle it. Ask the practitioner whether top-up sessions are expected for you, what they cost, and how that decision would be reviewed.

Is PRP for hair loss available on the NHS?

The British Association of Dermatologists says PRP is not offered under the NHS but can be sought privately. The NHS advises seeing a GP about hair loss before going to a commercial hair clinic.

How will I know whether PRP is working?

Hair changes slowly, so agree with the practitioner in advance how and when progress will be checked, for example dated photographs in the same lighting. Trial follow-up was mostly 3 to 6 months, and BAD describes 6 to 12 months or more for some other hair treatments.

See PRP hair loss treatment information and book a consultation

Sources and further information

• American Family Physician (January 2022) summaries: Dervishi et al. 2020 (13 RCTs, 343 people, 2 to 5 injections over 2 months, 3 to 6 months follow-up, I² = 100% for density); Evans et al. 2020 (30 studies, 687 people, 1 to 6 sessions, up to 6 months); a network meta-analysis whose PRP versus low-level laser estimate crossed zero and was rated low quality; variation in preparation, frequency, technique and follow-up as confounders. Accessed 3 November 2026.
• Dervishi et al., Journal of Cosmetic Dermatology 2020: systematic review pooling seven studies (171 people or half-head areas) favouring PRP for hair density. Accessed 3 November 2026.
• Zhang et al., J Cutan Med Surg 2023: meta-analysis of 9 RCTs (238 patients); hair density higher with PRP than placebo at 3 and 6 months; hair count and diameter not significantly different from placebo; no serious adverse reactions reported. Accessed 3 November 2026.
• BAD leaflet (updated June 2024): minoxidil at least 6 months and possibly up to 12 months before benefit may be noted; finasteride up to 14 months; PRP is not offered under the NHS but can be sought privately. Accessed 3 November 2026.
• NHS (reviewed 24 January 2024): see a GP if worried about hair loss and before going to a commercial hair clinic; no treatment is 100% effective; some treatments may not be available on the NHS. Accessed 3 November 2026.
• Existing Progen PRP page is the booking destination; booking button points to the clinic's booking portal. Opened 3 November 2026.