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Polyglyceryl-10 Pentaisostearate softens and smooths the skin, and also keeps oil and water blended together.
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Polyglyceryl-10 Pentaisostearate's CosIng-listed function is "skin conditioning - emollient": softens and smooths the skin.
A patch-test caution, not a hard avoid. A 1995 lab study found Malassezia furfur really does hydrolyse synthetic fatty-acid esters back into free fatty acids — ethyl esters (like ethyl oleate) fastest, isopropyl esters (isopropyl palmitate, isopropyl myristate) next — and the released unsaturated fatty acids fed the yeast's growth more than saturated ones did. So the mechanism is real for at least some esters. But this remains the biggest over-flagging bucket: many ubiquitous emulsifiers (glyceryl stearate, PEG-100 stearate) are built so the fatty acid isn't released in a usable form, and many fungal-acne-prone people tolerate them fine, especially in rinse-off. Treat a match as 'worth patch-testing', not 'certainly breaks you out'.
Polyglyceryl-10 Pentaisostearate appears in 0% of the 7,132 decoded products in our catalog (1 product).
On Korean labels, Polyglyceryl-10 Pentaisostearate is listed as 폴리글리세릴-10펜타아이소스테아레이트.
Compiled from the EU CosIng database (ref 58465) · snapshot 16 June 2026. CosIng is an informational, non-legally-binding reference. Inclusion does not mean an ingredient is approved, safe, authorized for cosmetic use, or clinically effective. An INCI list does not reveal concentration, pH, ingredient grade, delivery system, or finished-formula performance.