What it is
Sodium Palmitoyl Sarcosinate is an amino-acid-based anionic surfactant formed from palmitic acid coupled to sarcosine (an N-methyl glycine derivative). In cosmetics it serves as a relatively mild cleansing and foaming agent and can also provide a conditioning, smooth feel. In sunscreens it is generally present as a minor surfactant or texture aid rather than a primary functional active.
Safety & warnings
Sarcosinate surfactants are considered relatively mild and are generally well tolerated on skin. As with any anionic surfactant, very high levels or prolonged contact can contribute to dryness, but at the levels typical of leave-on sunscreens it is unlikely to cause issues.
Origin & sourcing
Semi-synthetic. It is produced by combining palmitic acid, a fatty acid that can be sourced from plant or animal fats, with sarcosine, then neutralizing with sodium.
Questions everyone asks
What kind of surfactant is this?
It is an amino-acid-based anionic surfactant made from palmitic acid and sarcosine, valued for its relatively mild cleansing and foaming behavior.
What does it contribute to a sunscreen?
It typically acts as a minor surfactant or texture aid, supporting cleansing, foaming, or a smooth feel rather than sun protection.