Stearidonic acid

Stearidonic acid (CAS 20290-75-9), commonly abbreviated as SDA or identified by its lipid number C18:4, is an omega-3 fatty acid derived primarily from plant-based sources such as echium and hemp seed oil. It functions as a metabolic precursor to longer-chain omega-3s, offering formulators a more bioavailable plant-derived alternative to ALA for omega-3 enrichment across multiple industries.

In food and nutraceutical formulations, SDA is incorporated into functional foods, dietary supplements, and fortified beverages targeting omega-3 enrichment without reliance on marine-sourced ingredients. Feed manufacturers use it to enhance the omega-3 profile of livestock and aquaculture products, supporting the development of consumer-facing omega-3-enriched meat and dairy products.

In personal care, SDA-rich oils are formulated into skin-conditioning products where the fatty acid profile supports barrier function claims relevant to specific product positioning and marketing. Pharmaceutical and nutraceutical developers also source it as a reference standard or active ingredient in clinical-grade omega-3 research formulations for various therapeutic applications.

Stearidonic acid is available as a purified liquid fatty acid or as a concentrated fraction within plant-derived oil matrices. Supply is offered in research-grade and food-grade specifications. Purity levels typically range from standard oil concentrations up to highly purified isolates for pharmaceutical or analytical use. Packaging ranges from small quantities for R&D to bulk volumes.