Guess it depends on who you read.
http://webpages.charter.net/jdrzeczycki/Healthsite/flax1.html
Personally growing up in a pharmaceutical family and having a degree myself i kind of avoid everything if possible. I know too much. I won't even take an aspirin.
I get my Omega 3's from walnuts..a handful every day..keeps my cholesterol down along with an avacado or two a week.....
Pat