Look for Omega 3 fish oil.
You have to search for pharmaceutical grade is better. Cos the content is precise.
As for the food grade, they may have write this amount, but it is not accurate.
Food grade means as long as it is hygenic then it is ok...
e.g. Ribena is only sugar water. No Vitamin C, but it stated it has. It was on the news. New Zealand high school student was measuring the Vit C level of Ribena. But can't found any.
Pharmaceutical grade means the content has to be precise.
Fish oil brand