If you are looking at investing in a Vitamin C serum, you are right to wonder about its shelf life and effectiveness, as well as the mileage you can get out of a bottle. When it comes to the popular Vitamin C + E, Ferulic acid serum, it’s pretty well known that the ascorbic acid in the skincare serum is prone to breaking down in light and heat. What you might not realize is that individual manufacturers can do a lot to help that.\r\nIncreasing the Shelf Life of Serum\r\nAnything that can be done to decrease the ascorbic acid’s exposure to light, heat, and air will help to keep it from breaking down into its component molecules. That means it will also lengthen the life of your Vitamin C serum. Timeless serum formulas are packaged in an opaque bottle with a tight seal, and that is designed to help them stay active for longer. Storing them in a cool dry place fully sealed will help lengthen that shelf life even more.\r\nHow Long Does a Bottle Last With Continuous Use?\r\nIf you are wondering how long a bottle of serum will last, it is hard to tell from the outside. Looking at Vitamin C serum reviews will help you get a feel for the differences from brand to brand, but even those reviews usually fail to mention the ways that individual use habits can affect a serum bottle’s lifespan. Factors that can change how long your bottle lasts include:\r\n\r\nAmount used in a single application\r\nSize of the application area\r\nFrequency of application\r\n\r\nOther Recommendations\r\nIf you are looking for a great skincare counterpart to go with your Vitamin C + E serum, check out our Vitamin B5 serum and our other skincare products.