Important Question: When Will Unopened Beauty Products Expire?

"Shampoo and conditioner formulas tend to remain very stable in an unopened container, which means they can typically last two to three years. Once opened, they are exposed to contaminants that will start the bacteria growth process. (FDA testing has been done to determine the acceptable amount of bacteria before it is deemed unsafe or contaminated and have placed a mandatory regulation to include a universal open jar symbol on any container sold for retail, so be sure to look for it on your products.)" — Lisa Silliker