Learn how to make milk kefir at home with just 2 ingredients. This homemade milk kefir is creamy, tangy, and ready in about 24 hours with 5 minutes of hands-on work.
Place the kefir grains in a clean glass jar and pour the milk over them. Do not stir.
Cover the jar with a breathable cloth or paper towel secured with a rubber band. Set on the counter away from direct sunlight.
Let the milk ferment at room temperature for 12 to 24 hours, until slightly thickened and pleasantly tangy. Warmer kitchens ferment faster.
Set a fine mesh strainer over a clean jar and pour the kefir through, stirring gently so the kefir passes through and the grains stay behind.
Transfer the grains to fresh milk to start the next batch. Lid the finished kefir and refrigerate for up to 2 weeks.
Notes
Whole milk produces the creamiest kefir, but 2% milk also works well.
Avoid using metal strainers or utensils with kefir grains for extended periods. Plastic or stainless steel with brief contact is generally considered safe, but plastic is the easiest option.
If your kitchen is warm, fermentation may finish in 18 to 20 hours. Cooler rooms may take up to 36 hours.
Slight separation into curds and whey is normal and simply means the kefir has fermented longer.
The standard kefir grains to milk ratio is 1 tablespoon of grains per 2 cups of milk, and it scales in either direction.
If you're taking a break, store the grains in fresh milk in the refrigerator for up to one week before feeding them again.