Are vitamins worth it? Does it really strengthen the immune system? Does Vitamin C can cause kidney stone?

Im admin at hospital night shift and I dont take vitamins and they advise me to take vitamins everyday to strengthen my immune system. I have ascorbic acid at home 500 mg and I always take it everyday. But I read on internet that taking ascorbic acid can cause kidney stone? Like possible side effects? So do you think its better to just eat fruits and vegetables to get natural vitamins or take vitamins supplements?

Are vitamins worth it? Does it really strengthen the immune system? Does Vitamin C can cause kidney stone?
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