It's perfectly fine to handle. Carbon fiber in FDM 3D printing is largely a lie. It's not that there isn't carbon fiber in there, it's just that it's chopped up so finely that it's practically pointless by the time it's printed. At best, all it does is destroy any printer not set up to handle it. It's basically like printing sandpaper. Honestly, I'd avoid it entirely; same goes for glow-in-the-dark. Only reputable supplier I know for GITD is Das Filament, which ball-grinds their glow powder before inclusion into the stock.
If you're interested in real carbon fiber in FDM prints, the only people to really see are Markforged.