Optimal food site recommends using within 6 months. If you just have half a bag might not be worth messing with it. Others that store multiple bags I could see still using even after 6 months if it stored correctly and no signs of mold /moisture etc....

However I am no expert on what Jim states on the fatty acid and vitamin breakdown....are those essentially gone after 90 days after production?

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3/4 Acre Pond: HSB,SMB,YP,HBG,RES