How Many PRP Sessions Before You Actually See Hair Regrowth? The Real Timeline

Most people need three to four PRP sessions, spaced four to six weeks apart, before judging results, and visible regrowth typically starts around three to six months after the first session. That is the protocol used in most of the clinical trials that show PRP works, and it is why a single session almost never settles the question. Here is the realistic timeline, what happens at each stage, and how to tell whether it is working.

The standard course, and why it exists

Hair follicles cycle slowly. A follicle pushed back into its growth phase today takes weeks to produce a hair thick enough to notice, and PRP's effect is cumulative: each session repeats the growth-factor signal that wakes miniaturised follicles up and thickens what they produce. The randomised trials behind PRP for pattern hair loss mostly used three to four monthly sessions, which is why reputable clinics sell courses rather than single shots. At The London PRP Clinic, the standard start is three sessions four to six weeks apart, costing £1,215 for the course.

The realistic timeline

In the first month, expect little visible change; some people notice reduced shedding first, which is a genuinely good early sign. Months two and three, after the second and third sessions, is when early responders start seeing baby hairs along the hairline or less scalp showing through. The clearest change usually shows between months three and six, measured properly with baseline photographs rather than bathroom-mirror impressions. Density keeps improving up to about a year in good responders.

After the initial course, the effect fades without maintenance. Most protocols use a single top-up session every three to six months. Skipping maintenance is the most common reason people conclude "it wore off", which is exactly what the biology predicts.

How to tell if it is working for you

Judge by three things: shedding rate first, then new fine hairs, then thickness and coverage. Take photographs in the same light at the start and every month; honest clinics do this for you at baseline. If nothing at all has changed by six months after a full course, PRP is unlikely to be your answer, and a good clinic will say so and redirect you, whether that is medical treatment, a transplant opinion or further investigation of the cause.

To plan a course and get an honest baseline assessment, message us on WhatsApp, book a consultation or call 020 3951 3429.

Frequently asked questions

How many PRP sessions before you see hair regrowth?

Usually three to four sessions four to six weeks apart, with visible regrowth starting around three to six months after the first session. Reduced shedding often comes first, within the first month or two.

Can one session of PRP make a difference?

Rarely in any visible way. The trials that show benefit used courses, and the effect is cumulative. One session is a reasonable taster of the procedure but not a fair test of the treatment.

How long does each session take?

Around 45 to 60 minutes including the blood draw, preparation, numbing and the injections themselves. You can go straight back to normal activities, with a few short aftercare rules.

What happens if I stop after the first course?

The gains gradually fade over the following months, which is why maintenance sessions every three to six months are part of most protocols. PRP manages pattern hair loss; it does not cure it.

Can I speed up results by having sessions closer together?

No good evidence supports cramming sessions, and the hair cycle sets the pace regardless. The four to six week spacing in the trial protocols exists because that is what produced the results.

References

Zhang X, Ji Y, Zhou M, et al. Platelet-rich plasma for androgenetic alopecia: a systematic review and meta-analysis of randomized controlled trials. Journal of Cutaneous Medicine and Surgery, 2023.

Paichitrojjana A, Paichitrojjana A. Platelet rich plasma and its use in hair regrowth: a review. Drug Design, Development and Therapy, 2022.

NHS. Hair loss. nhs.uk, reviewed 2024.

Written by The Wellness Team and medically reviewed by The Wellness Clinical Team. This article is for information only and does not replace a consultation.