There were so many good things you could get years ago that seem more difficult to get hold of now. But a lot of them are still there, just have to go searching...sometimes the older pharmacies are really useful.I haven't found Brewers yeast at CVS I asked, I had to buy from health food store and I also ordered on line. Years ago you could buy Brewers yeast at most Pharmacies but it's not as popular with humans as once was so it's harder to find.
