Let's say that we had two different bottles (brands) of fish oil sitting side-by-side. Each bottle had 1,000mg capsules. Are the capsules the same?
The answer is NO.
Here's why: With regard to omega-3, there are HUGE differences with regard to sources, quality, and quality. The best sources of omega-3 oil is from cold salt-water fish such as sardines,anchovies, and salmon. Warm water and fresh water fish are not considered acceptable sources of omega-3. Did we say that eating warm water fish and fresh water fish was bad? No, we did not. They just aren't good sources of omega-3.
With regard to quality, a lot has to do with the extraction process of the oil from its source, as well as the elimination of PCBs, dioxins, furans, PAHs, mecury,and of course, other heavy metals. You obviously want to remove the unwanted junk while still preserving the quality of the oil.
When it comes to the right amount, here is what you must know: At least, an average adult should be taking no less than 1,000 EPA per day. We did not say, "1000mg of omega-3 or fish oil per day." We speccifically mentioned EPA.
EPA (Eicosapentaenoic Acid) is the heart and soul of fish oil. It , along with DHA(which is much more important for little ones and nursing moms), are what counts when it comes to omega-3. Two 1,000mg capsules may have very different levels of EPA. Some have as little as 70mg, and others have as much as 750mg. The point? Oil...is not oil...is not oil.
You have to know what to look for.