Mesoceutical VC Serum Advanced Serum 20ml Unused Unopened High concentration Vitamin C Due to the high concentration, those with sensitive skin may experience a slight tingling sensation. I purchased these in bulk at a salon, but they didn't quite agree with my skin, so I'm selling them. I've discounted them significantly from the original price, so I cannot offer any further discounts. Shipping is planned via Yu-Yu Mercari Bin or Raku-Raku Mercari Bin. The specific method will be determined just before shipping based on packaging materials, but it will definitely be anonymous shipping.