What it is
This ingredient is derived from red algae (class Rhodophyceae) and hydrolyzed to break its polysaccharides and other constituents into smaller, more soluble fragments. Red algae are naturally rich in sulfated polysaccharides and minerals, and the hydrolyzed extract is used to support surface hydration and impart a conditioned feel. In sunscreens it acts as a supporting marine botanical rather than as a UV filter.
Safety & warnings
Red algae extracts are generally well tolerated in topical formulas. Sensitization is uncommon but possible in predisposed individuals. The ingredient is water-compatible and not associated with comedogenicity.
Origin & sourcing
Marine-derived. It is obtained from red algae (Rhodophyceae), a class of seaweeds, with the extract then hydrolyzed to lower molecular weight.
Questions everyone asks
What is Rhodophyceae?
Rhodophyceae is the scientific class for red algae, a group of seaweeds. This ingredient is a hydrolyzed extract of that algae.
What does it do in a formula?
It works as a conditioning and humectant botanical that supports skin hydration and a smooth feel. It is not a UV filter.