No-Ox Anti-Oxidant Thread Lubricant -- found at Amazon and at ProVape, when they aren't out of stock, is generally recognized as better for steel.
Noalox, an anti-oxidant compound (grease), was used by many, until it was discovered it's made for aluminum and could pit the steel. Many of us used it for ages with no noticeable ill effects --on the battery end threads of our steel mods, and some still prefer it. Amazon has it too.
One teeensy tube of either will last a long time, even for mod enthusiasts. Because of that, I have no clue what vendor might have either available.
I don't use either on my connection threads.....but a lube enthusiast would have to chime in why it has not been recommended. It could be that we don't want to add extra resistance at that crucial spot---and noalox is not a good conductor.