I read it to be a syringe or an iv drip. It definitely feels like disparate levels of administering, but going around this studio with an iv seems really inconvenient. > Later, just before taping, Joe goes over and gets his own jab of NAD+.

No, given the substance he probably did indeed mean intravenously. NAD is degraded significantly in the stomach.

I read that the same until the next line

> Later, just before taping, Joe goes over and gets his own jab of NAD+.