Ingredient dictionary

Benzoic Acid

A small, naturally occurring acid that helps keep formulas fresh by slowing the growth of mold and yeast. It is on the label of 78 products in our library. Checked against our library November 6, 2026.

The catch: none for most people; check the full product list if your skin reacts easily.

What Benzoic Acid does

Slows mold and yeast growth
Protects water-based products from spoilage
Works best in slightly acidic formulas

Benzoic acid occurs naturally in many plants, including cranberries and some resins. The version in most cosmetics is made in a lab, and it is the same molecule.

Water-based products can grow mold and yeast over time, so formulators add preservatives to keep them stable. Benzoic acid is one of the older choices for this job, and it is often used alongside other preservatives. It is a white crystalline powder that is added in small amounts, and it works best when the formula is slightly acidic.

Good for

Suits water-based products such as body wash, shampoo, moisturizers and cleansers that need protection from mold and yeast.

Be careful if

Nothing in particular for most skin types.

Frequently asked questions

Is benzoic acid safe in skincare?

Benzoic acid has a long history of use in cosmetics and food. It is generally well tolerated at the levels used in skincare. Like any preservative, it is still a good idea to patch test a new product if your skin is very sensitive.

Can benzoic acid irritate skin?

Reactions are uncommon. Some people with sensitive or reactive skin may notice mild stinging or redness, especially on broken skin. If that happens, stop using the product and check with a dermatologist.