Docosahexaenoic Acid

Docosahexaenoic acid (DHA) is an omega-3 fatty acid used in topical products primarily for barrier support and anti-inflammatory effects, typically at low concentrations (about 0.1–1%) often within an emollient base. In clinical and consumer use it is generally well-tolerated and not a primary irritant, but as a highly unsaturated lipid it can oxidize in poorly stabilized formulas, which may increase stinging or provoke reactivity in very sensitive or eczematous skin. Given the low inherent irritancy yet non-zero risk in compromised-skin populations, it fits a very gentle score. Safety Notes: In mass-market moisturizers/serums, DHA is typically delivered via marine oil or algae extracts and shows up at trace-to-low levels (often ~0.001–0.05% DHA active) because of odor/oxidation control and because the INCI may appear as part of an oil blend rather than a stand-alone active. Specialty consumer anti-inflammatory/skin-barrier or post-procedure support products using refined algal/fish omega-3 concentrates (encapsulated or heavily antioxidant-protected) reach about 0.5–2.0% DHA active in leave-on formats; higher levels are uncommon in OTC due to sensory stability (rancidity) and formulation constraints. Rinse-off products generally sit at the very low end (trace levels), while the upper end is primarily observed in leave-on oils/serums/creams.