With a 100 mg per ml mix, 80 units would actually be 80 mg, not micrograms. Most start around 5 mg then move to 25 mg. Jumping straight to 80 mg would probably sting a lot.
I'm increasing my NAD+ shots step by step. The usual plan calls for 100-300 mg daily at first, then fewer times a week. Right now I'm at 80 mg and it stings badly. Anyone else running subq NAD+ at similar amounts, how do you handle the burn or make it less intense? My mix is 100 mg per ml. In a few days I'll move to 100 units and later 200 units at that strength. One place online suggested adding a bit of lidocaine.