Does PRP for hair loss actually work, and how long before you know?
Medically reviewed by
The LovMedSpa medical team, led by Dr. Ahmed Elsoury, MD and Mark Ennett, PhD, CRNA
Last reviewed: August 2026
It works for a specific kind of hair loss and does very little for the rest. Platelet-rich plasma (PRP, an autologous growth-factor concentrate made from your own blood) is most useful in early to moderate androgenetic thinning, where the follicles are miniaturizing but still alive. It does not regrow hair from scarred or fully dormant scalp, which means a slick bald crown is not a PRP case regardless of what you are told.
The timeline: three sessions, judged at month four
The standard protocol is three sessions spaced four to six weeks apart, then maintenance every four to six months. You should not judge results before month four. Hair cycles slowly, and the first visible change is usually reduced shedding rather than new growth. New growth, when it happens, shows around month five or six as finer hairs that thicken over the following cycle.
Why PRP fails: the diagnosis nobody confirmed
The most common reason PRP fails is not the PRP. It is that nobody confirmed the diagnosis. Thyroid disease, iron deficiency, postpartum telogen effluvium (a temporary shedding phase after childbirth), and traction alopecia all present as thinning, and none of them respond to platelet injections. Bloodwork first is not an upsell; it is the difference between treating the problem and treating the appearance of the problem.
PRP is an addition to a plan, not a substitute for one
The second reason is running PRP alone. The evidence is consistently stronger when PRP sits alongside topical minoxidil or an oral agent rather than replacing them. PRP is an addition to a hair loss plan, not a substitute for one.
Common questions
How many PRP sessions does hair loss treatment take?
The standard protocol is three sessions spaced four to six weeks apart, followed by maintenance sessions every four to six months. PRP is a series with an upkeep schedule, not a single treatment.
When should I expect to see results from PRP?
Not before month four. Hair cycles slowly, and the first visible change is usually reduced shedding rather than new growth. New growth, when it happens, shows around month five or six as finer hairs that thicken over the following cycle.
Why is bloodwork done before starting PRP for hair loss?
Because the most common reason PRP fails is an unconfirmed diagnosis. Thyroid disease, iron deficiency, postpartum telogen effluvium, and traction alopecia all present as thinning, and none of them respond to platelet injections. Bloodwork first is the difference between treating the problem and treating the appearance of the problem.
LovMedSpa evaluates the cause of thinning before starting a PRP or PRF (platelet-rich fibrin) series rather than beginning treatment on presentation alone, under the clinical oversight of medical director Dr. Ahmed Elsoury, MD (New York and Connecticut) and Mark Ennett, PhD, CRNA (South Florida), available across our Brooklyn, Manhattan, Staten Island, Aventura, and West Farms locations. A consultation is the best way to determine whether your pattern of thinning is a PRP case at all.
This is general information, not medical advice; candidacy and treatment planning are determined by a licensed provider at consultation.