The dietary supplement industry is growing - just like the weight loss sector. It is a fact that vitamins as well as minerals are an essential a component of a healthy diet. And in case we are aware we are not very likely to get the minerals and vitamins which we need through our diet - taking vitamin supplements is a wise idea. Based on the pros in the Mayo Clinic, dietary, vitamin supplements could be needed if:

Supplements are able to end up with a physiological effect on the body they should be viewed as drugs with side effects and possible negative interactions with other over-the-counter along with prescription medications. A recent Harvard study concluded that dietary supplements can cause unsafe reactions with prescription medications.
A good example of a dietary supplement that may be unsafe if used with a few prescription medicines is St. John's wort, which in turn is taken away to treat depression. Based on Medline Plus, a company of the US National Library of Medicine and National Institutes of Health, reports have shown it to turn down the efficacy of medications including blood thinners, best testosterone booster dubai (check here) oral contraceptives, plus compounds to treat heart failure, mood disorder, AIDS, stroke, and heart attack. The Natural Medicines Comprehensive Database, states that you will find more than 180 nutritional supplements which have the potential to work together with Warfarin - a common blood thinner.
There are definitely very good reasons to take dietary and vitamin supplements, especially if you fall into any of the groups listed above. But, whether or not you have to take supplements, you need to actually consult with your primary health care provider to insure that the supplements you take are safe and won't negatively interact with your other medications.