Can common cold worsen by having citrous fruits?

vitamins are not medicines. You can't take them and get rid of a disease. Vitamin C does help the immune system develop, but if you already have a cold then it won't help you heal faster. I don't think, at the very least, that vitamin C consumption HURTS, by any means, when you have a cold. imo best source of vitamins, generally, is in raw fruits and veggies, not supplements (I only say that b/c brand quality tends to be hit-and-miss, and most people don't really do any *thorough* research on the brand of the supplements they take). And of course, we all know that a good thing to do when one has a cold is to gently consume lots of clear liquids. I would just be careful about trying to get your vitamin C from iron-rich veggies, though, whenever one is sick. Because iron can enable pathogenic microrganisms to thrive.