If you are thinking about buying flaxseed oil, you might want to save your money for something better. There is no reason to believe that the oils are good for your health.
The point of confusion has to do with advertisements concerning the "heart healthy" benefits of omega-3 fatty acids. Some omega-3s are present in vegetables oils. Others are only found in the oils of fatty fish. Guess which ones are lacking in the modern-day diet?
There are several different omega-3 fatty acids. Those of most importance to the human diet are ALA, DHA, EPA and DPA.
DHA is essential for normal brain development and function. It is present in human breast milk, but not cow's or soy milk, which is why infant formulas are, today, DHA-fortified.
In order to get DHA, without taking a fish oil supplement or eating fatty fish, you would need to consume specific types of marine algae or supplements that contain it. That's the best choice for strict vegans, but it's too expensive for most of us and it is an "incomplete" supplement. Since DHA is all that it contains.
EPA is also essential for normal brain function. Is it present in flaxseed oil? No.
Studies concerning the heart healthy benefits of omega-3 fatty acids were conducted using EPA and DHA, which are derived from fatty fish. There is some EPA in certain kinds of seaweed or kelp. So, for a vegan to include EPA in his or her diet, eating kelp is a good choice. The rest of us can eat fish or take a good fish oil supplement.
There is a small amount of evidence showing that DPA also contributes to cardiovascular health, when combined with EPA and DHA. It is found only in cold-water seafood. There are no vegan sources of the nutrient.
So, what's in flaxseed oil? ALA is the only omega-3 that it contains. It also contains a relatively large amount of omega-6 fatty acids, which most people get too much of, anyway.
If you could cook with it, it would be a good choice, because it contains a higher ration of omega-3s than 6s. But, the flavor and odor are unpleasant. It is edible. But, until recently, it was primarily used to polish furniture. You will still see linseed oils in hardware stores.
Canola oil contains a good omega-6 to 3 ratio. It is almost perfectly balanced and is good for cooking. Olive oils are healthy choices, too. If you stay away from corn, sunflower and peanut oils, you should be in good shape.
There is no reason to take flaxseed oil. That's thermal conductivity of fuel oil the bottom line. It adds fat to your diet and there is no scientific research showing that it is good for your health.
The supplements that you should take are those that contain EPA, DHA and DPA. There are mountains of scientific evidence concerning the benefits of those fatty acids.
If you compare fish to flaxseed oil, the winner is obvious. Of course, not all fish supplements are the same, so you'll need to learn a little more about them, before you buy.