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Milk Kefir Starter Instructions

Cultures for Health Milk Kefir Starter Grains pouch beside jars of finished milk kefir and a strainer of grains

Your packet contains living milk kefir grains. Give them fresh milk and a warm spot, and they will make thick, tangy milk kefir again and again.

Activation: a few batchesFresh batch every 24 hours

Activate your grains

Watch first

See it made in minutes

Prefer to watch? This quick video walks you through activating your grains and making your first batch.

Before you start

Grab these first

Use these ingredients and tools for the best results.

1 packet of dehydrated milk kefir grainsUse the entire packet for activation.

Pasteurized whole milkAvoid ultra-pasteurized (UHT) and raw milk during activation.

A one-quart glass jarRoomy enough to reach 4 cups of milk once your grains are active.

Coffee filter or tight-weave cloth + rubber bandA breathable cover keeps the jar protected.

A plastic mesh strainerFor separating the grains from finished milk kefir.

Temperature is important

Keep your grains between 68°F and 85°F. Any lower and it takes much longer to thicken; any higher and harmful bacteria can start to grow.

Cultures for Health Milk Kefir Starter Grains pouch with the milk, jar, strainer, filter, and rubber band needed to get started

Phase one

Activate your milk kefir grains

Do this once when opening a new packet of dehydrated grains. You will make a few small batches, adding a little more milk each time, until your grains are strong enough for a full quart.

Step 1 Step 2 Step 3 Step 4 Ready?

ACTIVATION 1 Done

Add the grains to fresh milk

Empty the entire packet of dehydrated milk kefir grains into 1 cup of fresh, cold pasteurized milk and stir. Do not use raw milk for activation.

Dehydrated milk kefir grains being stirred into a glass jar of fresh cold milk

What you will see: The grains look small and firm at first. They need a few batches in fresh milk to plump up and get active.

ACTIVATION 2 Done

Cover and let it culture

Cover the jar with a coffee filter or tight-weave cloth secured with a rubber band. Let it culture at room temperature (68°F–85°F). Starting at hour 12, check whether the milk has thickened to the consistency of heavy cream or thicker.

Glass jar of milk covered with a coffee filter and rubber band culturing on a counter

What you will see: When the milk thickens and smells and tastes pleasant, you have kefir! Even if it does not thicken but smells and tastes pleasant, you can use it in baking in place of buttermilk.

ACTIVATION 3 Done

Strain and move up to more milk

As soon as you notice a change in the milk’s texture, strain out the grains and put them into fresh milk, increasing the amount by 1/2 cup each batch until you reach 4 cups. Use this schedule for the milk to use in each batch:

Batch number → milk to use

Start1 cup 21.5 cups 32 cups 42.5 cups 53 cups 63.5 cups 74 cups

Important: For each batch, only increase the volume of milk if you noticed a change in the milk’s texture within 24 hours of culturing. If not, use the same amount of milk and culture again as before.

Milk kefir grains being strained through a plastic mesh strainer into fresh milk

ACTIVATION 4 Done

Reach 4 cups — your grains are activated

Once your total batch size reaches 4 cups and the milk thickens on schedule, your grains are activated and ready for Phase Two.

A full quart jar of thickened milk kefir with active grains ready to strain

What you will see: Thickened milk that smells and tastes pleasantly tangy, cultured within about 24 hours at 4 cups.

ACTIVATION CHECK

Thickened milk at 4 cups?

Your grains are ready for Phase Two. If the milk is not thickening on schedule yet, keep culturing at the same milk amount and repeat until it does. Some grains need a few extra batches to fully wake up.

Phase two

Make milk kefir with activated grains

Once activated, your grains can make a fresh batch about every 24 hours.

Step 1 Step 2 Step 3

BATCH 1 Done

Add grains to fresh milk

Transfer the activated grains into up to 4 cups of fresh milk in a clean glass jar.

Activated milk kefir grains being added to a quart jar of fresh milk

Want it tangier and a little fizzy? After adding your activated grains to the fresh milk, cover the jar with an airtight lid instead of a breathable cloth. This traps the gas the grains release and can give your kefir a slightly fizzier texture.

BATCH 2 Done

Cover and culture for about 24 hours

Cover the jar with a coffee filter or cloth secured by a rubber band and let it culture at room temperature (68°F–85°F). Starting at hour 12, check whether the milk has thickened to the consistency of heavy cream or thicker.

Covered jar of milk kefir culturing at room temperature

What you will see: The milk thickens and smells pleasantly tangy. If it is still thin, give it more time and check again.

BATCH 3 Done

Strain, enjoy, and start again

When culturing is complete, strain out the grains with a plastic mesh strainer. The liquid is your finished milk kefir — refrigerate and enjoy. Move the grains straight into fresh milk and repeat every 24 hours.

A sealed jar of finished milk kefir being placed in the refrigerator to store

What you will see: Thick, tangy milk kefir. Your grains stay in the strainer and are reused batch after batch.

FINISHED BATCH

Thick and pleasantly tangy

Refrigerate and drink your finished milk kefir, or flavor it. Keep the grains moving into fresh milk.

Troubleshooting

Is this normal?

Milk kefir can look different from batch to batch. Use these checks before you worry.

My milk has not thickened yet

Give it more time and keep checking after hour 12. A cooler room slows things down. During activation, keep culturing at the same milk amount until it thickens — some grains need a few extra batches to fully wake up.

It smells and tastes pleasant but stayed thin

That is fine. Even if it does not thicken, as long as it smells and tastes pleasant you can use it in baking in place of buttermilk. As your grains strengthen, batches will thicken more reliably.

My grains are still small

Look for gradual changes. Active grains become more plump over the first several batches. Keep feeding them fresh milk on schedule.

When do I move up to more milk?

Only increase the milk by 1/2 cup when the previous batch changed texture within 24 hours. If it did not, repeat the same amount of milk before moving up.

What temperature should I use?

Keep activating and culturing grains between 68°F and 85°F. Any lower and it takes much longer to culture; any higher and harmful bacteria can start to grow.

What kind of milk should I use?

Use pasteurized whole milk. Avoid ultra-pasteurized (UHT) milk, and do not use raw milk during activation.

Do I throw away the grains after straining?

No. Save the grains and place them into fresh milk. They can be used over and over.

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