The first week with your kefir grains, day by day
In short
Grains that have travelled need two to four days to wake up. The first two jars stay thin and only slightly sour; the third thickens; from day four the kefir is creamy, lightly fizzy, and the grains start to grow. Every morning, the same five minutes: strain, fresh milk, same spot. Don't rinse, don't switch milks, don't give up on day two.
The daily routine
- Strain
Pour the jar through a plastic sieve over a bowl, stirring gently with a plastic spoon.
- Fresh milk
The grains, unrinsed, into a litre of whole milk in a clean glass jar.
- Lid resting on top
Not screwed down, so the gas can escape.
- Room temperature
20 to 25 °C, out of the sun, for 24 hours.
- Bottle the kefir
Into the fridge; it keeps a week.
Day by day
| Day | What you see | What you do |
|---|---|---|
| Arrival | Puffed pouch, grains in thick tangy milk | Strain, fresh milk |
| 1 and 2 | Milk still thin, faintly sour | Strain anyway, fresh milk |
| 3 | Thicker, a little whey, fresh tangy smell | Strain, taste, fresh milk |
| 4 to 7 | Creamy, a light fizz, grains growing | The 24-hour routine |
Normal or not?
Normal: grains floating or sinking, sticking together, whey at the bottom, a yeasty smell, thin kefir for the first three days. Not normal: a rotten smell or a pink or green layer. Then send a photo before doing anything.
Still runny after a week?
Three usual causes: a cold kitchen under 18 °C (give it 36 hours or a warmer spot), skimmed or plant milk (switch to whole milk), or too much milk for 20 g (go back to one litre or less). White, firm, fresh-smelling grains are alive and will get there.


A first week with someone to ask
Natural Probio grains come with a guide that walks you through these seven days, an e-book of recipes, and an address where a real person looks at your photo. Tracked UK delivery, money-back guarantee.
Order live milk kefir grainsGrains from time-honoured methods, unique and resilientDelivery across the UK, trackedMoney-back guaranteeOver 20,000 customers
First-week questions
Can I drink the first day's kefir?
Yes, it is just mild and thin. Many people use it in pancakes or a smoothie.
My grains aren't growing yet. Is that bad?
No. They usually start growing in week two, with whole milk and a steady 24 hours.
Can I send a photo?
Yes, to hello@natural-probio.com: the jar and the grains in the sieve, in daylight. Usually answered the same day.

