What's the harm?

Have a look at http://www.whatstheharm.net/ which tells you exactly what it says in its name.

It won't give you proof and won't give you evidence, but when someone says to you one day "but what's the harm in it?" this is a great source of information.  There is a nice introduction video from Penn Jillette, the loud half of Penn and Teller.

Unfortunately what you find on that site is not always cheerful reading.  In the section about homeopathy for example there are many stories of people with treatable conditions who decided to try alternative medicine and died unnecessarily.

There is a name for 'alternative medicine' that is proven to work by the way.  That name is "medicine"!