What it is
Isopropyl lauroyl sarcosinate is a liquid ester made from the amino acid derivative sarcosine combined with lauric and isopropyl groups. In formulas it acts as a light, dry-feeling emollient and an effective solvent that helps dissolve and disperse other ingredients, including some organic UV filters. It is valued for giving a smooth, non-greasy slip and an elegant after-feel, which is why it appears frequently in lightweight Japanese sunscreen serums and lotions.
Safety & warnings
It is generally well tolerated as a cosmetic emollient and solvent. As with most fatty esters, individual sensitivity is possible, and very oil-rich leave-on formulas may not suit users prone to congestion. No notable fragrance-allergen content is associated with the pure ingredient.
Origin & sourcing
Synthetic. It is produced by esterification of a lauroyl sarcosinate with isopropyl alcohol; the sarcosine backbone may be sourced from natural or synthetic routes.
Questions everyone asks
What does isopropyl lauroyl sarcosinate do in sunscreen?
It works as a light emollient and solvent, improving spreadability and helping dissolve other ingredients so the product feels smooth and non-greasy on the skin.
Is isopropyl lauroyl sarcosinate natural or synthetic?
It is a synthetic ester, made by combining a lauroyl sarcosinate with isopropyl alcohol.