Efficacy of Pine Needle Extract in a Rat Model of Androgenic Alopecia February 2019 in “ Nanoscience and Nanotechnology Letters ” Yongping Zheng, Haitang Wang, Ling Zhang 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 ingentaconnect.com →