I am concerned about the purity of fish oil preparations… the oceans have contaminants.

Good question, and you are right – ocean contaminants are a consideration. What’s in the water is in the fish. Some fish, especially shark, king mackerel, and farm-raised salmon, can be contaminated with mercury, PCBs, and other industrial and environmental chemicals/pollutants. ALP High 3 fish oils are derived from mackerel, tuna, salmon, sturgeon, mullet, bluefish, anchovies, sardines, herring, trout, and menhaden. ALP High 3 fish oil is carefully purified to reduce heavy metals, dioxins, and PCBs, in addition to being tested for oxidation levels. ALP High 3 exceeds strict international standards for guaranteed pure and potent fish oil, will always exceed the stated amounts of EPA and DHA, and is manufactured in a cGMP facility. Always insist on the IFOS five-star rating — your guarantee of quality and purity when selecting fish oil supplements.