A "registry and results database of publicly and privately supported clinical studies of human participants conducted around the world." Also links to the resulting publication when applicable.
MedlinePlus (not to be confused with MEDLINE, the PubMed journal index) is the NIH's database of health information for patients. MedlinePlus covers treatments, medications and supplements, medical terminology, and links to recent research on medical topics.
"The world’s largest biomedical library, NLM maintains and makes available a vast print collection and produces electronic information resources on a wide range of topics”; includes databases PubMed, Medline, MeSH, etc.
Samuel C. Williams Library