Does shampoo expire?

Unopened shampoo is usually long-lasting, often up to 2 to 3 years. After opening, the shelf life becomes shorter, around 6 to 12 months. This is because the product is then exposed to air and bacteria. Pay attention to changes in smell, color, or texture; these are signs that the shampoo is no longer good to use. It is advisable to use shampoos with a high amount of natural ingredients a bit sooner.