|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. Open access to the scientific literature means the removal of barriers (including price barriers) from accessing scholarly work.
There are two parallel roads towards open access: Open Access articles and self-archiving. Open Access articles are immediately, freely available on their Web site, a model mostly funded by charges paid by the author (usually through a research grant). The alternative for a researcher is self-archiving (i.e., to publish in a traditional journal, where only subscribers have immediate access, but to make the article available on their personal and/or institutional Web sites (including so-called repositories or archives)), which is a practice allowed by many scholarly journals