What it is
This ingredient is a mixture of branched (iso) alkanes with carbon chain lengths of eleven to thirteen, typically derived from petroleum or, increasingly, from renewable feedstocks. It is a clear, low-viscosity fluid that spreads quickly and leaves a light, dry, non-greasy skin feel. In sunscreens and skincare it is used as an emollient, solvent, and texture-enhancing carrier that improves spreadability.
Safety & warnings
Lightweight isoalkanes of this type are generally well tolerated and are valued for their light, non-greasy feel. They are typically considered low risk for comedogenicity and are not associated with significant irritation at cosmetic use levels.
Origin & sourcing
Synthetic. It is manufactured as a defined fraction of branched alkanes, traditionally from petroleum-derived sources and now also from plant-based or other renewable feedstocks.
Questions everyone asks
What does C11-13 Isoalkane do in sunscreen?
It works as a light emollient and solvent that improves spreadability and leaves a non-greasy, fast-absorbing feel.
Is C11-13 Isoalkane greasy?
No; it is a low-viscosity fluid known for a light, dry skin feel and quick spreading.