http://www.ewg.org/ A rich source of information about safety and potential toxicities of a vast number of products (sun screen, cosmetics, pesticides, etc.) and foods in USA including a guide for effective and safe
The Center for Environmental Therapeutics (CET) has authoritative information and resources for patients, consumers, health care providers and workplace managers about effective use of environmental therapies and non-medication treatments for seasonal affective disorder, nonseasonal depression, and circadian rhythm sleep disorders. It also fosters research on environmental interventions that promote alertness, energy, and performance—while combating fatigue, stress, depression, and sleep disturbances that affect millions of people. It also offers Self Assessments for a variety of disorders.
Sponsored by the American Academy of Pediatrics, this website has a wealth of information and resources for parents about nutrition, development, behavior, ADHD, immunizations, and more.