There's a lot of controversy over multivitamins. Some people think everyone should take them. Others think only certain people should. And many people say they are a complete waste of money. But what's the truth? Well for starters, let's define what a multivitamin is.  A multivitamin is a supplement that has more than one vitamin. So technically, something containing vitamin A and vitamin C could be considered a multivitamin. But generally speaking, it's a supplement with a lot more vitamins than that. In fact, sometimes multivitamins will even have other substances like saw palmetto or ginseng which aren't vitamins at all. But who actually needs to take a multivitamin?  According to doctors, a good multivitamin could be beneficial for you if you meet the following conditions:1. You're at risk for several nutritional deficiencies and can't change your diet to fix the issue.2. The multivitamin you plan to take has a sufficient amount of the vitamins you need to negate the deficiency.3…