Hi Holly! If your recipe is calling for discard or unfed starter, like in a muffin recipe as you suggested, then you won't need to reactive the starter before using it. When your starter has been stored in the fridge, you'll want to take it out and feed it two to three times before using it in a recipe calling for active or fed starter. You want to see that the starter is just about doubling in size and becoming bubbly between feedings. Happy baking! Morgan@KAF

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