Its easy to spread the benefits of fish oil. But you need to know the appropriate those for its effects. For starters, MOST studies/trials had their subjects take 1500-2000mg of combined EPA and DHA (6-10 1000mg capsules/softgels of fish oils) before positive health benefits of the supplements were reported.
Considering how cheap the supplement is (800-1000php for 400 softgels, kirkland brand), i highly recommend taking AT LEAST 3 softgels per day. I highly doubt that 1 softgel a day would result to any positive outcome. I personally take 6 softgels a day and the results have been great.