How do you know if shampoo contains parabens?

To find out whether a shampoo contains parabens, it is important to check the ingredient list on the packaging. Parabens are often listed under names such as methylparaben, ethylparaben, propylparaben, or butylparaben. If you see these names, the shampoo contains parabens. Many shampoos that avoid these ingredients use mild cleansing agents such as coco-glucoside or decyl glucoside, as well as natural preservatives.