And two samples of Kirkland Signature failed the USP's disintegration test for pills ... Check with a doctor before taking omega-3 pills because they can interact with some medications.

USP (United States Pharmacopeia), or ConsumerLab. Omega-3s may interact with medications that thin the blood, or anticoagulants. These drugs help prevent blood clotting. High-dose omega-3 ...

Both fish-oil pills and krill-oil supplements supply the healthful omega-3 fatty acids DHA and EPA ... but the U.S. Pharmacopeia (USP), a nonprofit authority that works to verify supplements ...