Eucerin Original Healing, Creme for Very Dry Sensitive Skin, Fragrance Free Versus Eucerin Skin Calming Lotion

Water. It's the most common cosmetic ingredient of all. You'll usually see it at the top of ingredient lists, meaning that it makes up the largest part of the product.

So why is it so popular? Water most often acts as a solvent - this means that it helps dissolve other ingredients into the formulation.

Phenoxyethanol is a preservative that has germicide, antimicrobial, and aromatic properties. Studies show that phenoxyethanol can prevent microbial growth. By itself, it has a scent that is similar to that of a rose.

It's often used in formulations along with Caprylyl Glycol to preserve the shelf life of products.

Piroctone Olamine is used to treat fungal infections and often found in anti-dandruff shampoo.

This ingredient is particularly effective against Malassezia, the root cause of dandruff.