You clearly did not do homework. It's called a supplement for a reason, to supplement what you lack. And you think everyone's absorption is the same even if you eat fish? How many fish can an adult or child eat a day?
Wool where got omega-3? Use ur brain please. What u should really read on the label is the amount of EPA+DHA in one softgel vs the extra useless oil. Molecularly distilled. Best still if they mention what fish and from where, good example like nordic seas. Krill oil is good if u have the money.

Don't simply read and follow blindly la. Read research papers, studies and the journals they quote in their articles if you want reliability on the stuff u read.