First, vitamins won't compensate for you not eating vegetables. They can certainly help somewhat, but food is how we eat and best absorb nutrients, so learn to eat vegetables and how to prepare them so that they taste good to you. Organically grown tastes better. Second, whenever a supplement doesn't agree with you, stop taking it. It doesn't mean you can never take the supplement, but it does mean that brand isn't for you. It could be something they put in as fillers or binders, and it is more common with cheap badly made supplements or ones sold by direct marketing than with more expensive well-made ones found in your better health food stores. If it was the supplement that caused the rash, it should go away when you stop taking it. If it doesn't, then you need to see a doctor to see what kind of rash it is so you can figure out how to treat it -- you can use natural remedies to treat most rashes, but you do need to know what kind of rash it is to know which ones to use.