A good way to judge the validity of nutritional information is to check to see if it comes from a reputable source. If the product is GMO-free certified by a reputable organization, for example, it is safe to say that the product was not created using any genetically modified elements. Another great way to judge the validity of a product is to check if what it says on the packaging is too good to be true. For example, if a company claims that its product provides all the daily recommended vitamins for an adult, then you probably can't trust that company.
Work Step by Step
See the above.