The minerals and other substances derive from plants are called "nutrients". There are a lot of plant extracts that can be used magnum xt reviews as nutritional supplements. Examples of these substances are carotenoids, flavones, phytosterols, fiber and others. Some of these substances are extracted directly from the fruits and vegetables, while others come from other plants such as wheat grass or alfalfa sprouts. The other substances to look for are those that have scientific evidence for their efficacy and safety. There is no problem with using synthetic ingredients because they are available in a wide range of formulations. The problem comes when supplements containing questionable ingredients are manufactured. Unfortunately, this does not result to the consumer getting a health supplement with the desired effect. One example of questionable ingredients includes thistle. This substance has been shown to cause certain liver diseases as well as to interfere with the absorption of other nutrients. Another example is beta-sitosterol. This substance is commonly found in dietary supplements that are intended for weight loss. Although its purpose is weight loss, research shows that some people develop cancerous tumors when they consume it. The point is, do not believe everything that you read from your supplement aisle. In most cases, they are just trying to sell you something. A good supplement will not contain one or two ingredients. It will contain several. A good supplement will contain one or more of the following substances: vitamins, minerals, proteins, fatty acids, enzymes and cellular membrane components.