Lol I was thinking that myself. It is not in the BNF for prescribing ! If you take it as a supplement one of the big issues is that there is no way of being certain that it actually contains what it is supposed to even if it is expensive. If this research pans out and there are no side effects I suspect it won't be long until we get pharmaceutical grade NMN or something similar. It shouldn't be too expensive either (at least not to produce).