Hexagonal boron nitride, a.k.a. white graphite, is non-toxic, very very slippery, tends to stick to metal, tends to not have other substances stick to it, and seems to have worked very well in my first ride. Anyone have reasons why I should wash it off real quick? :-)
Well, white graphite (or hexagonal boron nitride for all the big brainers) is fine to use as a lubricant, but like @mattnz said, don't snort it (mattnz is big brain). Regular graphite can be corrosive do certain metals with moisture, but as long as its white graphite, I don't see any issues that would pop up.