After going through every ingredient room from every area and having Salchichonium from the Pond, I made the same amount nuggets I would make during a run where I didn't have that item and didn't go to any ingredient rooms. The average would be 34-36 nuggets and never would go beyond that if I simply make it to the very end of the game. So currently, this mechanic feels useless and like a false sense of progression as purposely going into these rooms and grabbing this item feels like a waste because the amount you gain feels so fixed.
Salamander Axolotl- Salchichonium and ingredient rooms run
Archvale Axolotl- Vanilla run
As you can tell, first one I gained 36 nuggets and the vanilla one with the video and picture (recorded too soon and so it cut off early) made 34 nuggets
Glad to know I wasn’t crazy