Ultra Strength One-per-Day RxOmega-3 with 25 mcg (1,000 IU) vitamin D3 is a pharmaceutical grade fish oil providing one of the most powerful strengths of eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) available. Molecularly distilled and guaranteed for purity and safety from environmental pollutants like PCBs and mercury or other harmful compounds, RxOmega-3 surpasses the strictest international standards for quality. One serving (1 softgel) provides 600 mg of EPA and 300 mg of DHA omega-3 fatty acids. Ultra Strength One-per-Day RxOmega-3 Enteripure softgels offer targeted delivery using a technology that embeds pure and natural ingredients into the softgel casing to prevent them from breaking down in the stomach, ensuring no fishy aftertaste. Ultra Strength One-per-Day RxOmega-3 is also available without vitamin D3.