That something may be useful in a lot of external applications says absolutely nothing about its safety when consumed.
Right, we don’t know how safe something is.
I certainly don’t know and have all the facts, but when you look at the vast amount of consumer based products for external use and the vast amount of medical products for external use, the point I’m making, is that there are not a lot of things that are produced in the world, where they can be applied both externally and internally.