This product promises immediate whitening effects using a fresh serum. - Brand: Yunth - Product Name: Pure VC Whitening Serum - Contents: 1ml x 28 - Made in Japan - How to use: Fresh serum with a 30-second expiration Thank you for viewing. I have an extra one from my subscription, so I am offering it for sale. This is a new, unopened item. #Yunth #Serum #Unused