Sue, we don't do much work with cake yeast ourselves because it isn't as widely available to US consumers as dried yeast, so we tend to defer to the experts at Red Star Yeast for info on this product: http://bit.ly/2hebUrj As you can see, cake yeast is highly perishable and should be marked with a "best if used by" date. As with all yeast, if you're ever in doubt of its freshness, it is recommended that you "proof" it before using; and they do not recommend freezing it. Hope this helps! Mollie@KAF

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