raykensella.....i have been taking omega-3 for 5 years dur to doc orders. he said it has been found to help the medication to go throughout the boy which helps mood. he said to buy the cheapest. i was on 4,000 unit a day but have cut down to 1,ooo. i cannot tell a diff but i take it for my cholesteral. it's up to you. looks like you have several answers to your question. hang in there. hugs pj56