|Natural products related to CAM include herbal medicines (also called botanicals), vitamins, minerals, and probiotics. These types of natural products are becoming more popular among Americans: 17.7% of American adults reported using non-vitamin/non-mineral natural products in 2007. A popular product among adults in 2007 was oil/omega 3s, used by 37.4% of all adults who reported using natural products.
Review articles are the summary of current state of understanding on a particular research topic. They analyze or discuss research previously published by scientist and academicians rather than reporting novel research results. Review article comes in the form of systematic reviews and literature reviews and are a form of secondary literature. Systematic reviews determine an objective list of criteria, and find all previously published original research papers that meet the criteria. They then compare the results presented in these papers