https://medlineplus.gov/

"MedlinePlus is the National Institutes of Health's Web site for patients and their families and friends. Produced by the National Library of Medicine, the world’s largest medical library, it brings you information about diseases, conditions, and wellness issues in language you can understand. MedlinePlus offers reliable, up-to-date health information, anytime, anywhere, for free.

You can use MedlinePlus to learn about the latest treatments, look up information on a drug or supplement, find out the meanings of words, or view medical videos or illustrations. You can also get links to the latest medical research on your topic or find out about clinical trials on a disease or condition.

Health professionals and consumers alike can depend on it for information that is authoritative and up-to-date. MedlinePlus has extensive information from the National Institutes of Health and other trusted sources on over 975 diseases and conditions. There are directories, a medical encyclopedia and a medical dictionary, health information in Spanish, extensive information on prescription and nonprescription drugs, health information from the media, and links to thousands of clinical trials. MedlinePlus is updated daily and can be bookmarked at the URL: https://medlineplus.gov/." (accessed 12-2016).

From the Wikipedia article on MedlinePlus, accessed 12-2016:

"MedlinePlus is an online information service produced by the United States National Library of Medicine. The service provides curated consumer health information in English and Spanish.^[1] The site brings together information from the National Library of Medicine (NLM), the National Institutes of Health (NIH), other U.S. government agencies, and health-related organizations. There is also a site optimized for display on mobile devices, in both English and Spanish. In 2015, about 400 million people from around the world used MedlinePlus.^[2] The service is funded by the NLM and is free to users.

MedlinePlus provides encyclopedic information on health and drug issues, and provides a directory of medical services. MedlinePlus Connect links patients or providers in electronic health record (EHR) systems to related MedlinePlus information on conditions or medications.

PubMed Health^[3] is another NLM site that offers consumer health information, in addition to information for health professionals.

History

The National Library of Medicine has long provided programs and services for professional medical scientists and health care providers, including MEDLINE and the various services that access it, such as PubMed and Entrez. By the 1990s, more members of the general public were using these services as Internet access became widespread.^[4] But nonprofessional users could benefit from reliable health information in a layperson-accessible format.^[5][6][7] The National Library of Medicine introduced MedlinePlus in October 1998, to provide a non-commercial online service similar, for example, to the commercial WebMD. In 2010 another NCBI service, PubMed Health, complemented MedlinePlus in offering curated consumer health information; PubMed Health focuses especially on finding information about clinical effectiveness of treatments.^[8]

MedlinePlus initially provided 22 health topics in English, which expanded to almost 1000 health topics in English and Spanish, plus links to health information in over 40 languages. MedlinePlus was recognized by the Medical Library Association for its role in providing health information.^[9] The site scored 84 in the American Customer Satisfaction Index for 2010.^[10]"