The Agency for Healthcare Research and Quality (AHRQ) is the lead Federal agency charged with improving the safety and quality of America's health care system. AHRQ develops the knowledge, tools, and data needed to improve the health care system and help Americans, health care professionals, and policymakers make informed health decisions. You'll find research, effective programs, and more on their website.
This an other trustworthy organizations are great places to get background information about conditions and interventions. Don't forget about other health related organizations like the International Dyslexia Association or Massachusetts General Hospital.