for those interested his 'proof' of sands 'medicinal power' is a homeopathic prooving.
The rules of homeopathy are that like cures like. In order to find out what symptoms a substance causes a healthy person has to injest the substance and keep a track of any symptons he/she thinks are being experienced. The idea is that an ill person showing signs of the same symptoms will be cured by this substance.
I.E. in a healthy person, caffine causes you to stay away, therefore the cure for insommnia is caffine. The more the caffine is diluted, the more powerful the 'medicine'.
Hey I didn't make these rules up.

As i said before check out the sci tech evidence check or read some cochrane meta analysis' the links you have provided are what one would refer to as piss poor evidence.