Sources

The assistant is instructed to ground every answer in, and link to, these public, authoritative sources. If an answer ever cites something else, treat it with more caution and check it here.

• MedlinePlus (U.S. National Library of Medicine)
  Plain-language health encyclopedia, drug and supplement information, lab test explanations.
• NHS (UK National Health Service)
  Conditions A–Z, symptoms, medicines, written for the public.
• CDC (U.S. Centers for Disease Control and Prevention)
  Infectious disease, vaccines, prevention guidance.
• WHO (World Health Organization)
  Global health topics and fact sheets.
• NICE (UK National Institute for Health and Care Excellence)
  Evidence-based clinical guidelines.
• Cochrane Library
  Systematic reviews — the strongest summaries of what the evidence shows.
• DailyMed (U.S. FDA drug labels)
  Official prescribing information for medicines sold in the U.S.
• StatPearls (NCBI Bookshelf)
  Peer-reviewed clinical reference used by clinicians in training.

How evidence is rated

• Strong — multiple good-quality trials or systematic reviews agree.
• Moderate — good studies exist but with some gaps or inconsistency.
• Limited — small, few, or lower-quality studies.
• Expert opinion — guideline consensus without strong trial data.