Yi Yan's poems are good. The instant shaping effect of Yi Yanshi is much better than that of Bugul's collagen. Yi Yanshi's 30% microspheres strengthen the stimulation of collagen, and are more energetic and elastic. Compared with Ryerson's collagen, Yi Yanshi can be completely metabolized by the human body, and the officially designated hospital can appoint a doctor to check it, which is guaranteed and safe. So Yi Yan's is good.