Effects of dietary intake of Colla corii asini on skin parameters and appearance: Results of a 12-week randomized, controlled, open-labeled trial
Background: As a traditional Chinese medicine, the Colla corii asini (CCA), obtained from the skin of Equus animus L, has been used to nourish blood in China for more than 2000 years.The beneficial role of CCA supplementation in beauty has been reported in different case studies; however, research supporting these claims remains sparse.Objectives: