Which is the quack medicine?

Richard Smith: Quite a lot of orthodox treatments are unsupported by firm evidence.

Crazy medicine

Dylan Evans: Only when alternative therapists abandon their crackpot theories will we be able to start taking them seriously.

Sue Blackmore: If any money is going spare for the NHS, let's spend it on real medicine that actually works.

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Alok Jha meets the scientist who wants to recruit half a million people for a controversial medical project.

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Sarah Boseley: Another wonder supplement bites the dust.

· Huge study of causes of ill-health starts next week· Project likely to turn into an albatross, say critics