January 2021 in “Journal of Cutaneous and Aesthetic Surgery” Platelet-rich plasma with microneedling is effective for hair loss, but the number of sessions needed varies.
February 2025 in “Drug Delivery and Translational Research”
March 2021 in “PARIPEX INDIAN JOURNAL OF RESEARCH” Microneedling combined with platelet-rich plasma therapy is more effective for hair regrowth in androgenic alopecia than microneedling alone, but it's more painful.