What it is
Polysorbate 61 is made by ethoxylating sorbitan stearate, producing a nonionic surfactant that helps disperse oils into water and stabilize emulsions. In sunscreens and moisturizers it is used to keep the oil and water phases blended into a stable, uniform cream or lotion. It is typically paired with a co-emulsifier such as a sorbitan ester to fine-tune the emulsion.
Safety & warnings
Polysorbate 61 is a widely used nonionic emulsifier generally considered well tolerated at the levels used in cosmetics. It is not a recognized fragrance allergen. As an ethoxylated ingredient it may contain trace processing impurities such as 1,4-dioxane, which reputable manufacturers control through purification.
Origin & sourcing
Synthetic; produced by ethoxylating sorbitan stearate, which is itself derived from sorbitol and stearic acid (a fatty acid).
Questions everyone asks
What does Polysorbate 61 do in a formula?
It is an emulsifier that keeps oil and water mixed together so the cream or lotion stays smooth and stable.
Is Polysorbate 61 a harsh detergent?
No. It is a mild nonionic surfactant used mainly for emulsifying, not for foaming or deep cleansing.