May 2024 in “Dermatologic surgery” Nonactivated low leukocyte PRP injections can significantly increase hair and follicle density in women with alopecia.
January 2025 in “Advances in Clinical Medicine” 
4 citations,
August 2018 in “Facial Plastic Surgery Clinics of North America” Platelet-Rich Plasma (PRP), a protein-rich extract from a patient's blood, shows promise in improving hair density, thickness, and quality, but the best method of use and number of treatments needed for noticeable results are still unclear.
21 citations,
June 2019 in “Dermatologic Surgery” Platelet-rich plasma (PRP) treatment has been found effective in promoting hair growth for alopecia patients, with minimal side effects like temporary pain and redness.
45 citations,
September 2018 in “International Journal of Women's Dermatology” PRP shows promise for hair loss treatment, with three initial monthly injections and maintenance every 3-6 months.