The American Academy of Family Physicians offers information on adult and child health conditions and healthy living. Its Web site has topics on medicines, doctor visits, physical and mental health issues, parenting, and more.

American Congress of Obstetricians and Gynecologists (ACOG) is a nonprofit organization of professionals who provide health care for women, including teens. The ACOG Resource Center publishes manuals and patient education materials. The Web publications section of the site has patient education pamphlets on many women's health topics, including reproductive health, breast-feeding, violence, and quitting smoking.

The Centers for Disease Control and Prevention (CDC) is an agency of the U.S. Department of Health and Human Services. The CDC works with state and local health officials and the public to achieve better health for all people. The CDC creates the expertise, information, and tools that people and communities need to protect their health—by promoting health, preventing disease, injury, and disability, and being prepared for new health threats.

The National Institute of Allergy and Infectious Diseases conducts research and provides consumer information on infectious and immune-system-related diseases.

The National Women's Health Information Center (NWHIC) is a service of the U.S. Department of Health and Human Services Office on Women's Health. NWHIC provides women's health information to a variety of audiences, including consumers, health professionals, and researchers.

The Planned Parenthood Federation of American provides comprehensive reproductive health care and consumer information about family planning, sexual health, and sexually transmitted diseases (STDs).

The Teen Talk Web site (www.plannedparenthood.org/teen-talk) has information for teens about dating, teen pregnancy, sexual orientation, gender identity, how teens can protect themselves against STDs, and more.