EPA and DHA are among the most researched compounds in clinical nutrition: triglycerides, cardiovascular protection, joint inflammation, cognition. Consistent and substantial. The catch is the label, and it is the same trick as the magnesium one. "Fish oil 1000mg" is the weight of the oil, not the EPA and DHA inside it. Turn the bottle over. Sometimes the combined EPA plus DHA is 300mg. Grade: Strong. The compound is not the problem. The bottle often is. Go and look at yours. What do the EPA and DHA numbers actually say?