Claims and counterclaims for nutritional supplements vie for the consumer's dollar.
Most supplements are single vitamins, minerals, or a combination of both.
These are just two of the categories of nutrients that are essential to health. All of these essentials and nonessentials are packaged in the foods we typically eat. Choose scientifically peer-reviewed sources. When other authorities in the field agree with the claim it is more reliable. Most vitamin preparations come from one manufacturer, yet the price varies according to who put the label on the bottle.