Authority source
Safety basis
No clear authority source is available in this profile yet.
Sulfur
SulphurSulfideSulfuric acid
Preservative
Sulfur is a naturally occurring element found in many things, like volcanoes and hot springs. It's used in products to help keep them fresh and prevent the growth of bacteria and mold.
What it is
Sulfur is a yellow, brittle solid element that's often used in its elemental or sulfide form to preserve products.
Found in
skincare products, acne treatments, foot powders, and some hair care products
The concern
Some people may experience skin irritation or allergic reactions to sulfur, especially if used in high concentrations or on sensitive skin.
Legal status
Generally recognized as safe for use in cosmetics and personal care products in the EU and US, but subject to concentration limits and labeling requirements.
Low Concern
Generally recognized as safe for use in cosmetics and personal care products at concentrations up to 1%.
Evidence & sources
Article / explainer
Article / explainer
No highly relevant article explainer found yet.
Video explainer
Properties of Sulfur | Properties of Matter | Chemistry | FuseSchool
Video
FuseSchool - Global Education
Watch videoCommunity questions
Community questions
Community discussions are not used as safety evidence and no highly relevant discussion is shown for this ingredient.
Related ingredient guides
Compare this ingredient with related ingredients and common alternatives.
Salicylic Acid
A common acne-care active often compared with sulfur in spot treatments and cleansers.
Benzoyl Peroxide
Another acne-focused ingredient users compare with sulfur for irritation and use-case differences.
Azelaic Acid
Often compared with sulfur in acne and redness routines.
Benzyl Alcohol
Another preservative in the reviewed ingredient set.
Citric Acid
Another preservative in the reviewed ingredient set.
Methylparaben
Another preservative in the reviewed ingredient set.
Last updated: June 9, 2026