I have used it before. I was impressed when I went to a medical beauty institution for a project. At that time, they recommended several products to me, and then through comparison, I chose Aiyanshi because it has never been used. Judging from the effect, the contrast between their homes is really strong! It is also very natural. It is not like other brands that directly inject collagen into the skin. Instead, it uses active substances to promote the regeneration of type I and type III collagen. It is safer than directly injecting collagen and is less likely to cause rejection reactions.