Fish oil is good. A multi-vitamin may also be good if you have a high activity level, if you don't, I don't think it's important.
Vit-D if you're up in the north or just don't catch enough sunshine. I'm from Portugal, so I don't need to supplement Vit-D.
Zinc if you don't usually eat liver or eggs. Magnesium could be a good one as well (Citrate). Potassium might be a worthy addition if you don't eat bananas, avocados or potatoes (I eat all of that so...).