Given what it does, I would be astonished if it isn’t massively carcinogenic.
[EDIT: and I now see that the thread was already there…]
OTOH, given the intended use on dementia, it may not matter. If they can refine it to the point where it’s just going to give you cancer in twenty years, that’s good enough; most dementia patients would have died of something else by then, anyway. Worth the price if it’s an effective Alzheimers treatment.