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Old 08-05-2013, 11:21 PM   #1
akdmax
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Default Yeast expiration

My apologies if this is already addressed. I did a search but Didn't find what u was looking for. Does anyone have any advice on yeast expiration? I have a bottle of WLP004 that shows best used by jun 6-13. Any issue pitching that tomorrow? Thanks in advance!


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Old 08-05-2013, 11:24 PM   #2
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I would highly recommend a starter, and / or getting a different vial. Yeast vials lose viability as they get older, and after that best by date, you may still get fermentation but who knows how many viable / healthy cells you'll have. Could use it, but would have better results with newer yeast.

Hope that helps, cheers!


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Old 08-05-2013, 11:30 PM   #3
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I'd recommend a starter. You only have approximately 23% viability there. Looking at the BS yeast tool, it is calling for 2 vials at that viability with a .85mL starter, so I would say maybe a step up starter would be called for. That is based on an OG of 1.048. There are several threads regarding this on here.
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Old 08-05-2013, 11:36 PM   #4
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A starter is definitely the way to go (though to be honest, I pretty much always advocate starters regardless of the yeasts viability).

I've gotten yeasts older than that going before, so with a good sized starter, plenty of aeration and yeast nutrient you should easily be able to use that yeast.
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Old 08-06-2013, 01:19 AM   #5
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like everyone else is saying, make a starter and you will be fine. I've used a 2 year old smack pack before and the beer turned out fine.
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Old 08-06-2013, 05:44 PM   #6
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Thanks everyone! Yeast starter it is. I have an older bottle of the same yeast as well, going to add that into the starter also and see what happens.


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