Dosage: Each packet will set 2 gallons of milk. Directions: Add 1 packet directly into your milk at the proper temperature when the recipe calls for adding starter culture. Culture Includes: s. thermophilus, d.s.lactis, helveticus and malto dextrin Storage: Keep packages in the freezer, they will last up to 2 years. This culture lasts out of the freezer (at room temperature) for 6 months so will be fine during postage. However, we suggest storing them in the freezer as soon as you get them in order to prolong their life.