Use a basic source to get an overview
Science encyclopedias and government health organization fact sheets are good places to start. Frequently, fact sheets will come in two versions, one for consumers and one for health professionals. Start with the consumer version to get familiar with the topic and then move onto the health professional version to get more detail.
These will help you find:
For more in depth information on medical uses, historical research, or consequences of over consumption, try one of the books on this page, or search for review articles in a database.