I take fish oil, 1000mg three times a day, and have done so for years, for a variety of reasons. One, it is known to help lower serum triglycerides (I have a family history of heart disease). Two, it is thought to be helpful for arthritis and dry eye syndrome (I have both). It is also supposed to be good for the gut.
I'm not sure it has done any of those things for me, since I still have to take a statin, am taking heavy duty drugs for arthritis, and dry eye (even had my tear ducts plugged), and always have some rectal cuff inflammation.
But, I can say that I am pretty functional. I take too many drugs to be able to even consider taking activated charcoal.
Jan