How do you know if a shampoo contains parabens?

You can tell whether a shampoo contains parabens by checking the ingredient list on the packaging. Parabens are preservatives that often end in “-paraben,” such as methylparaben, propylparaben, ethylparaben, or butylparaben. They are added to prevent the growth of bacteria and fungi, thereby extending the product’s shelf life.

This is a general informational question, so no product advice is provided.