I only have regular access to 2 yeast products here - active dry yeast from company #1 and active dry yeast from company #2.
I'm proofing them by mixing 6g of yeast + 1tsp of sugar + 325ml of room temperature water but unlike I've seen in youtube videos, neither of them makes any bubbles after 10 mins of waiting.. the surface of the liquid is completely still.
They still seem to rise the dough though, my pizza dough balls grow around 4x their size after a few hours at room temperature or a day in the fridge.
So is my yeast dead or alive? Maybe its just shy?