As a scientist, I am somewhat skeptical of many claims related to multivitamins and natural supplements. They are not well-regulated and recent studies have shown that many supplements do not even contain the ingredients listed in the packaging. If you are nutritionally deficient, you are more likely to improve your health by consuming foods that contain missing nutrients than by taking a vitamin. Any website that suggests that most people need to take several types of vitamins or supplements is not providing accurate information. There is a lot of pseudoscience in the world of nutritional supplements, so I would recommend using Pubmed or .gov or .edu sites and avoiding .com sites. You can also search for "pseudoscience" and whatever you're interested in to check for accuracy.
