This is a serum with double the concentration of a regular farming serum. (For professional use, this serum is only available for purchase by those who have received clinic treatments.) Retail price: ¥8,800 I missed the opportunity to use it, and the expiration date is approaching this month, so I would be happy if someone who is okay with that would purchase it. In addition to improving sagging and wrinkles, it also has antioxidant and anti-inflammatory effects.