Syrup taken to consume vitamins A, D, and E

Should I also take various other vitamins besides vitamin C?

I eat a lot of salads and vegetables for lunch every day.

And as a health supplement

I am taking Cerqulan RTG Omega-3 1200, a supplement containing vitamin A beneficial for the eyes, vitamin D good for bones, vitamin E that helps prevent skin aging, and other nutrients.

I take two capsules once a day, and the size of the capsules isn't small. They don't have a fishy taste when I take them, and they go down easily.