There is a problem with fish oil and flax oil, however. While Omega-3 has all kinds of beneficial effects, including as an anti-inflammatory agent, it is usually in combination with Omega-6, which has pretty much the opposite effect. (Omega-9 is also believed to be good, but in smaller amounts.)
To make matters worse, there is no clear distinction in labeling, with the same product being labeled “Fish oil with Omega-3” and “Fish oil with Omega-3 and Omega-6, and to distinguish them. Usually just the chemical names for Omega-3 will be on the label.
If you buy Salmon oil, the problem is solved - no measurable 6 present. Flax oil is heavy in 6 because it is a seed of a “grass.” Nuts are heavy in omega 9 oil.