I have used Nordic Natural Fish Oil for many years of my life, and have sold it at health food stores for years, also , to many many people. It has no after taste , no burping it up, it helps the brain, the memory, the heart, it lowers cholesterol, blood pressure, its a fantastic anti-inflammatory, and its CLEAN.
As I have aged, I have taken higher doses.
I went from their Omega 3,(in my 40's) to their Ultimate Omega(my 50's) to their 2X(my 60's and now entering my 70's). So I now take 2 of the 2X, once daily. which is an excellent dose of the EPA and the DHA, for my age.