I recently had someone approach me with a product called Protandim supposed to be wonderful. It is a MLM company I have sold Amway, Shaklee, Figurettes/Cameo, they are all great products BUT it is the top guys that make the money and it is hard work. So my advice would be to buy some of the product and you will then figure out if it is good and just buy more for yourself. Companies are required to label their products so you should be able to see what is in the product. Many companies require you to have a certain level of sales each month also. that means you are buying more than you need and will need to sell some of it.
Doctors are not taught much about nutrition in school so needless to say many of them cannot give you information about nutrition they are taught to treat symptoms not find out what is causing the problem.