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Sorbitan Isostearate

What Sorbitan Isostearate is & what it does

A gentle co-emulsifier that helps form stable emulsions and adds a smooth, conditioned feel. It is common in mild, skin-friendly formulas.

What is Sorbitan Isostearate and what does it do in sunscreen?

Sorbitan Isostearate is a gentle co-emulsifier built from sorbitol and isostearic acid. In a sunscreen it helps form stable emulsions so the oil and water phases do not separate, and it leaves a smooth, conditioned feel on the skin. It is common in mild, skin-friendly formulas and in tinted products where an even texture matters.

Is Sorbitan Isostearate safe?

Yes. The sorbitan esters are a well-established family of cosmetic emulsifiers with a long history of use and a good tolerability record. At the small amounts used in sunscreen, Sorbitan Isostearate is non-irritating for most people. Those with very sensitive skin can patch test a new product to be sure.

Does Sorbitan Isostearate clog pores?

Generally no. It is not flagged as comedogenic in our data, and it is used as an emulsifier in small amounts rather than as a pore-clogging oil or wax. If you are breaking out, look first at the richer emollients and oils elsewhere in the ingredient list.

Is Sorbitan Isostearate fungal-acne safe?

Not fully. Sorbitan Isostearate sits in the polysorbate and sorbitan ester lane, and the malassezia yeast behind fungal acne can feed on the fatty portion of these esters. If you are actively dealing with fungal acne (malassezia folliculitis) you may prefer to skip it. For everyone else it is harmless, and this is one specific skin concern rather than a general safety flag.

What is Sorbitan Isostearate on an ingredient list (INCI)?

"Sorbitan Isostearate" is the INCI name as it appears on the label, meaning sorbitan joined with isostearic acid. You will usually find it among the emulsifiers and texture ingredients, often alongside other sorbitan esters. It typically sits in the middle or lower part of the list rather than at the top.

Is Sorbitan Isostearate vegan?

Usually yes. Its building blocks, sorbitol and isostearic acid, are typically plant or synthetic in origin rather than animal-derived, so it is generally considered vegan-friendly. If strict vegan sourcing matters to you, the safest route is to check with the specific brand, since fatty-acid sourcing can vary.

Sunscreens with Sorbitan Isostearate

We rate 443 sunscreens that contain it, showing the top 10 by overall score:

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