Codium Tomentosum Extract

Codium tomentosum (a green algae/seaweed) extract is primarily used as a moisturizing, soothing, antioxidant/film-forming skin-conditioning agent, typically at low concentrations (~0.1–2%) in leave-on products. Clinical irritation risk is generally low, but as a complex botanical/marine mixture it can contain multiple proteins/polysaccharides that occasionally provoke stinging or dermatitis in highly reactive or eczema-prone users, especially on compromised skin. Given the low but non-zero potential for irritation/sensitization inherent to extracts, I rate it as gentle rather than “very gentle.” Safety Notes: In commercial skincare, Codium Tomentosum Extract (a seaweed/algae extract) is most commonly used as a secondary soothing/hydrating bioactive at low levels around 0.01–0.5% in leave-on serums, creams, masks, and after-sun products, consistent with typical supplier recommended use levels for algae extracts. High-strength consumer products marketed around ‘marine algae concentrate’ or barrier-repair/firming actives can reach ~1–5% (especially in leave-on emulsions and gel-serums), while rinse-off cleansers typically sit toward the low end due to short contact time and cost-to-benefit considerations. No specific EU/FDA concentration limit is set for this botanical extract beyond general cosmetic safety requirements, so the upper end is driven primarily by stability, odor/color, and irritation risk rather than regulation.