Question about tinctures

Question from a fellow grower:

I have another question. Does my homemade version of the tincture expire at some point? It tastes different after about a week. Do the commercial versions have preservatives?

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What do you use to make the tincture? Everclear? I keep mine in the freezer. It does get stronger but I’ve kept some for 4-6 months in the freezer and it was fine.