Save your money. Try and eat a balanced diet instead. Our bodies did not evolve to expect the required vitamins and minerals to be taken in one concentrated form.
I've read far too much research that shows they have little or no effect. Some studies as large a 150,000+ over eight years. Some even claim they can do harm

With a quick Google I found:
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In an analysis of 68 studies involving 232,606 people, researchers found no effect on mortality
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This bit was interesting:
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food sources of beta carotene are protective against lung cancer, but two large scale human trials showed a 28% increase in lung cancer risk among smokers taking high-dose beta carotene supplements. Follow up studies demonstrated that betacarotene in high dose supplement form increased the formation of precancerous lung cells.
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Vitamin Supplements: no benefits and potential harm