This depends on the patient, however results can be progressively seen starting a few weeks following initial treatment.
On average, hair density improvement of 25 to 30% can be expected, but results will vary as a function of the ability of the follicular bulb to regenerate in each individual. We make sure to take plenty of pictures so we can collaboratively review effectiveness.
In one study(a),(Gkini, M. A., Kouskoukis, A. E., Tripsianis, G., Rigopoulos, D., & Kouskoukis, K. (2014). Study of platelet-rich plasma injections in the treatment of androgenetic alopecia through an one-year period. Journal of cutaneous and aesthetic surgery, 7(4), 213–219. https://doi.org/10.4103/0974-2077.150743) results showed a significant increase in the rate of hair growth observed between the third and sixth months. Hair density followed a rising trend with a peak at 3 months. Patients with II-III grade of alopecia had better results compared to patients with more advanced alopecia.
Further, a 2019 literature review of the most recent studies (b) r(https://www.sciencedirect.com/science/article/pii/S2352647518300315?)eported that PRP demonstrated efficacy as a treatment modality for androgenetic alopecia. More recently, studies(c) (https://dx.doi.org/10.18203/issn.2455-4529.IntJResDermatol20221637)have indicated PRF can in some cases offer theoretical advantages over PRP.
As with all treatments, results may vary.
(a) Gkini, M. A., Kouskoukis, A. E., Tripsianis, G., Rigopoulos, D., & Kouskoukis, K. (2014). Study of platelet-rich plasma injections in the treatment of androgenetic alopecia through an one-year period. J(Gkini, M. A., Kouskoukis, A. E., Tripsianis, G., Rigopoulos, D., & Kouskoukis, K. (2014). Study of platelet-rich plasma injections in the treatment of androgenetic alopecia through an one-year period. Journal of cutaneous and aesthetic surgery, 7(4), 213–219. https://doi.org/10.4103/0974-2077.150743)ournal of cutaneous and aesthetic surgery,(Gkini, M. A., Kouskoukis, A. E., Tripsianis, G., Rigopoulos, D., & Kouskoukis, K. (2014). Study of platelet-rich plasma injections in the treatment of androgenetic alopecia through an one-year period. Journal of cutaneous and aesthetic surgery, 7(4), 213–219. https://doi.org/10.4103/0974-2077.150743) 7(Gkini, M. A., Kouskoukis, A. E., Tripsianis, G., Rigopoulos, D., & Kouskoukis, K. (2014). Study of platelet-rich plasma injections in the treatment of androgenetic alopecia through an one-year period. Journal of cutaneous and aesthetic surgery, 7(4), 213–219. https://doi.org/10.4103/0974-2077.150743)((Gkini, M. A., Kouskoukis, A. E., Tripsianis, G., Rigopoulos, D., & Kouskoukis, K. (2014). Study of platelet-rich plasma injections in the treatment of androgenetic alopecia through an one-year period. Journal of cutaneous and aesthetic surgery, 7(4), 213–219. https://doi.org/10.4103/0974-2077.150743)4), 213–219. https://doi.org/10.4103/0974-2077.150743 (Gkini, M. A., Kouskoukis, A. E., Tripsianis, G., Rigopoulos, D., & Kouskoukis, K. (2014). Study of platelet-rich plasma injections in the treatment of androgenetic alopecia through an one-year period. Journal of cutaneous and aesthetic surgery, 7(4), 213–219. https://doi.org/10.4103/0974-2077.150743)
(b) Stevens, J. and Khetarpal, S. 2019. Platelet-rich plasma for androgenetic alopecia: A review of the literature and proposed treatment protocol. International Journal of Women’s Dermatology 5(1), pp. 46–51(https://www.sciencedirect.com/science/article/pii/S2352647518300315?)
(c) B(https://dx.doi.org/10.18203/issn.2455-4529.IntJResDermatol20221637)hoite, K.S., Chikhalkar, S.B., Mishra, S.N. and Kharkar, V.D. (2022) Injectable platelet rich fibrin therapy for androgenetic alopecia: a series of 15 cases. International Journal of Research in Dermatology;398. (https://dx.doi.org/10.18203/issn.2455-4529.IntJResDermatol20221637) (https://dx.doi.org/10.18203/issn.2455-4529.IntJResDermatol20221637)