Chondrus Crispus Powder

Chondrus crispus (Irish moss) powder is primarily a film-forming thickener/skin-conditioning seaweed ingredient used at low levels in cosmetics, and it is generally well tolerated without the inherent irritancy profile of acids, retinoids, or surfactants. However, as an unrefined botanical/marine powder, it can contain a broader mix of naturally occurring proteins and trace constituents that increase the chance of irritation or sensitization in highly reactive or eczema-prone patients compared with purified gums/extracts. Given this low-but-nonzero risk in compromised skin, it best fits a gentle (not inert) score. Safety Notes: In commercial skincare, Chondrus Crispus Powder (Irish moss/seaweed powder) is often used at trace levels (~0.01–0.1%) in leave-on lotions/serums primarily for marketing/skin-conditioning claims or to support a natural positioning. More functional use as a viscosity/texture aid and water-binding seaweed solid is typically ~0.2–2% in masks and richer creams, while the upper end (~3–5%) is seen in consumer-available, high-solids wash-off masks, bath/soap bars, and exfoliating or clay/seaweed powder blends where higher loading is feasible without unacceptable grittiness or instability.