Is yeast that is two years old and has never been opened be used


3 Answers 3


If I were you, I'd do a simple test that determines, how active (= alive) your yeast is.

When you supply yeast with ideal living conditions, you can observe the activity - or lack of - as the yeast bubbles and foams.

For a test, you sprinkle yeast in lukewarm water and check for activity. A detailed description can be found here, for example.

This should give you the answer whether your yeast is still useable or not.


Well I just used a 7rys expired yeast that was vacuumed packed and rose my my baking buns and pizza. it bubbled when I tested it. Go figure

  • 1
    Welcome to the site - yes, vacuum packed and dehydrated/freeze-dried yeast will keep quite a long time, so long as the packaging is OK, this is because the yeast is induced into a spore-like state, which is quite stable.
    – bob1
    Commented Jun 29, 2020 at 8:13

No it wont work. I tried many a times with 2 years old dry yeast and it didnt work at all. Finally I came to the conclusion that old yeasts create more mess and wastage

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.