How do I evaluate health information I find online?

Prefer institutional sources (WHO, CDC, NHS, national health ministries, major medical societies) and peer-reviewed research over blogs and social media. Check the date, look for cited evidence rather than anecdote, be sceptical of anything selling a product or promising a cure, and confirm with your own clinician before acting.

Useful red flags: a single miracle cure, claims of suppression by the medical establishment, testimonials in place of data, and anything selling the solution it recommends.

Check whether the claim comes from a study in humans, its size, whether it was randomised, and whether other studies agree — a single small study rarely settles anything.