Sodium Stearate

Sodium Stearate is soap and usually the main thing holding a bar of soap together. In cosmetics, it does three jobs: it cleanses, thickens, and turns liquids into solid sticks.

Use levels vary hugely by product type; supplier guidance puts the typical range at 0.5-20%, with bar soaps at 5-20%, deodorant sticks at 4-8%, and under 1% when it's acting as a co-emulfisifier. Industry data has reported levels as high as 84% in some leave-on fragrance products.

Safety-wise, it's about as well-established as an ingredient gets. The FDA and European food-safety regulators treat this ingredient as safe in food.

Allergy risk is genuinely low too; stearates aren't on standard patch test series and published sensitization reports are scarce. The more realistic concern is irritation since high-percentage soaps can leave the skin tight and dry.