If I take those turmeric curcumin things should I stop taking vitamin c tablets???

Curcumin is a natural anti-inflammatory. Vitamin C is vital for cell growth. Both have anti-oxidant properties. If you have too much of either, your body gets rid of the excess. You should be able to get all the vitamins and minerals you need by eating a balanced diet. Don't spend money on having the most expensive pee in your neighbourhood.