Reusing Additives from last year

[LtCellars]

I would like to ask a question about reusing some of my additives from last year. This would include Opti Red, Lallzyme EX, and Go Ferm which were all vacuumed sealed after I used them.
I will be doing a Cab this year, if the grapes ever ripen. It was a cool spring here so everything is late.
Thanks

 

[jet]

The Scott Labs catalog says that OptiRed and GoFerm are good thru their marked expiration if stored at 65°F tightly sealed and dry. It also says that granular enzymes are good for several years, if kept dry.

HTH