There are more active volcanoes beneath the sea than on land by two orders of magnitude.
I believe you need scientific proof that something works before you entrust your health to it.
My grandfather played a mandolin, so I got my hands on that. Then on down to a banjo, and I found I couldn't play any kind of soft or mournful music with that so I took up the fiddle in my late 20s or early 30s - and that was far too late. But it keeps me off the streets. It has been a love of mine