John, there is no burden to prove something safe. Nothing is 100% safe. The burden is on those claiming it is unsafe. If there is no data to suggest this, then they are fear mongering.

I respect your admiration of peer-reviewed publications, but your expectation of random commenters to cite published studies on the safety of anything is bordering on the absurd. This is a comment section, not a peer-reviewed article not to mention as I mentioned above it is impossible to prove anything is 100% safe...you can overdose from drinking too much water or milk. Heavens even underpants might have some unsafe aspects.

Anyways, Alohas.