We unconditionally guarantee the quality of our concentrated EPA (eicosapentaenoic acid) and DHA (docosahexaenoic acid) formulas. They also exceed the quality criteria for the Council for Responsible Nutrition's Omega-3 Monograph (the industry's current voluntary standard for purity). Exhaustive testing measures include: in-house and third-party testing (by one of the world's leading quality testing labs) of marine oil for heavy metals and other harmful contaminants; in-house and third-party testing of EPA/DHA content of final product; in-house testing for yeasts, molds, and harmful bacteria; and in-house testing for disintegration time and shelf stability. These formulas are also enhanced with antioxidants to aid product stability and meet or exceed label claim (milligram, not just area percent).