I bought this item because we'll it was one of the items that were on sale. I got it for 10 dollars along with a few more items. So as I waited for my items to be delivered. When they arrived I went through everything and when I came to the vitamin c serum I opened it and peeled off the label and unscrewed the cap, I heard a "PSST" sound and pressure being released similar to the sound of a soda can opening. The serum immediately started to bubble and spill out of the tube (again, VERY similar to the sound + sensation of a can of soda opening). I immediately ran to the kitchen and tried to stop it from dripping everywhere. Half of the product spilled out. As the serum spilled, I noticed that the Vitamin C wasn't red but rather a pinkish-brown color. So I feel like it was a bit oxidized. I boufed the people of style Koren and they didn't want to replace the item and rather chose to give me 2 point for my faulty item. So Not buy next time