How many PRP sessions for hair? Many plans start with three sessions about a month apart, then a booster about every six months, according to the International Society of Hair Restoration Surgery (ISHRS). Studies have used 1 to 6 sessions, so your nurse sets the plan after looking at your scalp.
Written by Jen Adams, BSN, RN, Vice President of Clinical at InjectCo
Medically reviewed by Dr. Josh Allen, D.O., Medical Director on October 29, 2026
Medical disclaimer: This article is for general education and is not medical advice. Results vary from person to person. Talk to a licensed provider about your own situation.
There is no single number for everyone, but there is a common starting point. According to ISHRS, a common program is one treatment session each month for three months, followed by a booster session every six months.
A 2018 review of PRP for androgenetic alopecia found that studies used protocols ranging from 1 to 6 sessions, with different preparation methods and patient groups, rather than one agreed standard. For what PRP injections cost and their side effects more generally, see our guide to PRP injections: cost and side effects.
In the common ISHRS schedule, the first sessions are about a month apart. The 2018 review found a wider range in published studies, with sessions spaced anywhere from 2 weeks to 3 months apart. After the first series, ISHRS describes booster sessions every six months.
According to ISHRS, visible growth can be seen as early as 1 to 2 months, but it can take as long as six months to see a benefit. The 2018 review notes that improvement was most commonly reported after the third month. Results are not guaranteed: ISHRS says available data suggests at least 30 to 50% of patients will see some benefit, which is why realistic expectations matter as much as the schedule.
A few factors shape where you land in that range.
Some patients also ask about PRF for hair restoration, a related option, as part of the conversation with their nurse.
A nurse looks at your scalp and hair history and explains how many sessions to expect.
PRP $799 per session.
At InjectCo, PRP is $799 per session. Your nurse sets your plan at your consultation, including how many sessions make sense for your scalp and goals. The schedule above, from ISHRS and published research, is the general reference point.
PRP is not the right fit for everyone. ISHRS says people who are completely bald in the area of concern are not likely to benefit, and that patients with active skin conditions such as skin cancer or pre-cancer, or certain systemic diseases, should not have PRP.
If you have a blood disorder, take blood thinners or have any condition that affects how you heal, tell your nurse before you book. After a session, see our PRP hair aftercare guide for what to expect in the days after.
Usually not. ISHRS says PRP sessions will always need to be repeated, and the common program it describes is one session a month for three months, followed by a booster every six months. Published studies have used 1 to 6 sessions, so your nurse sets the plan for you.
In the common ISHRS schedule, the first sessions are about a month apart, though published studies have spaced sessions anywhere from 2 weeks to 3 months apart. Booster sessions after the first series are usually every six months. Your nurse sets the spacing for your plan based on how your scalp responds.
ISHRS says visible growth can show as early as 1 to 2 months, but it can take as long as six months to see a benefit. A 2018 review found improvement was most commonly reported after the third month. Results are not guaranteed; ISHRS says at least 30 to 50% of patients see some benefit.
No. According to ISHRS, stopping PRP leads to hair loss, because you generally keep only the hair the treatment helped grow while you continue. That is why boosters, about every six months in the common schedule, are part of the plan. Your nurse can help you plan maintenance after your first series.
The common schedule from ISHRS is a booster session every six months after the first series. Because the benefit fades when treatment stops, maintenance is part of the plan rather than an extra. Your nurse can help you set a maintenance schedule once your first series is complete.
PRP involves injections into the scalp, so some local, temporary discomfort at the injection sites is expected. ISHRS lists local and temporary pain as the main risk, since the material comes from your own blood. Your nurse can talk you through what to expect and comfort options before your session.
At InjectCo, PRP is $799 per session. Your total depends on how many sessions your plan includes, which your nurse sets at your consultation. If you are wondering whether an HSA or FSA might help, see our guide on HSA or FSA for hair loss treatment.
How many sessions you need depends on your hair, your goals and the protocol your nurse uses, but the evidence points the same way: most plans start with a series rather than one visit, changes take months rather than days, and not everyone responds the same. That is why a hands-on assessment matters more than any single number you find online.
Ask about a PRP plan built around your scalp and goals.
PRP $799 per session.
In this skin series: See also microneedling and chemical peels at InjectCo.
