Krill oil, I can't tell much yet as we've just started taking it.
Although I can say that when I started to take fish/cod liver oil(s) I saw a big difference in mental alertness and overall mood. Seeing as I was taking nothing else I know this was the cause.
Coconut oil enhanced my energy levels and my skin is becoming clearer, I know I was a candida sufferer and it has done a great job at killing it.
My psiorisis is also going away, damn stuff itches in my scalp.