Retraction: Observing the Clinical Efficacy of Combined Serum Microneedle Therapy for Moderate to Severe Androgenetic Alopecia in Scalp Repair October 2025 in “ Skin Research and Technology ” We don't know much about this study yet. We're maintaining the world's largest resposity of hair loss research. You can help out the community by sending a PDF of this study here . Not sure how to get a study's PDF? You can email the authors of the study. View this study on onlinelibrary.wiley.com →