Scenedesmus Deserticola Ferment Extract

Scenedesmus deserticola ferment extract is a biofermented microalgae-derived skin-conditioning/antioxidant ingredient typically used at low concentrations (generally well under a few percent) and is not pH-dependent like exfoliating acids. There is no strong clinical signal that it is a common primary irritant, but as a ferment/biologically complex extract it can provoke stinging or reactivity in a minority of highly sensitized or barrier-impaired users (e.g., active eczema), so it is best categorized as very gentle rather than exceptionally inert. Safety Notes: In commercial products this microalgae ferment extract is often supplied as a diluted carrier-based ingredient and is used at very low levels (around 0.001–0.05%) in mass-market leave-on creams/serums primarily for claims support and marketing positioning. More performance-driven leave-on products (anti-pollution/anti-aging/barrier care) commonly use it around 0.1–1% when the supplier’s recommended use level is followed. A small number of high-claim consumer-available serums/ampoules use it at elevated levels up to ~3%, which is near the practical upper end before texture, odor/color, and formula stability become limiting; rinse-off products typically sit at the low end due to brief contact time.