The white label manufacturer would provide the ingredients. I’m familiar with a couple companies who do that. One is Danny Cash, who make a variety of lame-ass right wing sauces. I’ve tried some of their sauces, and not only are they quite poor ingredient-wise, containing pointless preservatives, but they are also not great tasting. Not at all surprising for what is oddly grifting conservative bullshit (they used to make a few ‘maga’ sauces).