I use Dr.Mercola's krill oil since a few months. My EPA and DHA tested low in the beginning of the year, in a few months I will do the test again and see if it helped. Since because of my age (84) I have low stomach acid and with every meal I use the Thorne brand Betaine HCL & Pepsin. My advice about the stomach acid comes from Dr.Jonathan Wright, I will see if I can find back an article about gerd, I know has written about it. Hanna