Improvement in Scalp Hair in Middle-Aged Women Using Oral Enzyme Food and Collagen January 2015 in “ Jounal of The Korean Society of cosmetology ” Ji-Young Hwang, 김병곤, ⋅Sang-Mo Kang 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 kci.go.kr →