NutriBrew · Limerick, Ireland · Since 2019
Make your own milk or water kefir with fresh, live kefir grains grown in Limerick. We supply reusable cultures throughout Ireland, with clear brewing instructions and friendly support to help you get started.
Since 2019, we have helped home fermenters choose and care for their cultures. Our milk and water kefir grains are supplied fresh, never dehydrated. With regular feeding and the right care, you can strain and reuse them to make batch after batch.
For creamy milk kefir
Choose milk kefir grains for a creamy, tangy fermented milk drink. These soft, white cultures ferment dairy milk and can be reused after straining.
From €14.00
For dairy-free water kefir
Choose water kefir grains for a light, refreshing fermented drink made with water and sugar. Add fruit flavours after straining, with a second fermentation if you want more fizz.
From €13.00
Understand your culture
Kefir grains are living cultures of bacteria and yeasts held together in a natural gel-like structure. They ferment milk or sugar water into kefir. Despite their name, they are not cereal grains.
There are two distinct types: milk kefir grains and water kefir grains. Milk grains are soft and white, often resembling small cauliflower florets. Water grains, also called tibicos, are translucent and more crystal-like. They use different ingredients and are not interchangeable.
After fermentation, strain the grains from the drink and feed them again with fresh milk or sugar water. This is what makes genuine kefir grains reusable: you keep the culture rather than adding a new sachet for every batch.
Buying kefir grains or buying kefir? We sell the live cultures used to make kefir at home. These products are not bottles of ready to drink kefir.
Choose milk kefir grains if you enjoy a creamy fermented dairy drink. Choose water kefir grains if you want a dairy-free drink that you can flavour with fruit. Both need regular feeding, but their ingredients and finished drinks are different.
| What to compare | Milk kefir grains | Water kefir grains |
|---|---|---|
| Ingredients | Whole dairy milk | Water and sugar |
| Grain appearance | Soft, white, cauliflower-like clusters | Translucent, gel-like crystals |
| Finished drink | Creamy and tangy; thickness varies with fermentation | Light and mildly tangy; a second fermentation can add fizz |
| Typical brewing time | Around 24 hours in a moderate room; temperature and grain quantity affect timing | Usually 24–48 hours; temperature and culture activity affect timing |
| Contains dairy? | Yes, when made with dairy milk | No, when made with dairy-free ingredients |
| Can you reuse them? | Yes, with regular milk changes and proper care | Yes, with regular sugar and water changes and proper care |
Fresh cultures may need several batches to settle after delivery. Follow the instructions supplied with your grains rather than treating these typical times as a fixed deadline.
Fresh cultures. Practical help.
We grow and work with the cultures we sell. That experience helps us explain how to start your first batch, recognise normal fermentation changes and keep your grains going.
Our milk and water kefir grains are supplied as fresh, live cultures. You receive the grains themselves, with instructions for settling them into their new brewing conditions.
Based in Limerick, we have supplied home-fermentation cultures since 2019. Read the story behind NutriBrew and our work with live cultures.
If a batch behaves differently from what you expected, contact our team. We can help you review your milk or water, grain quantity, room temperature and fermentation time.
Our experience with kefir grains
Our research connection and our own cultivation trials tell different parts of our story: supplying water kefir cultures for a published project, and developing practical knowledge through repeated milk kefir batches.
The peer reviewed Kefir4All paper identifies Live Ferments, Ireland, our former trading name, and links to kefirgrains.ie as the source of the project's water kefir grains.
Published in the Journal of Microbiology & Biology Education in 2024, Kefir4All involved 123 citizen scientists in home and school fermentation over a 21 week project. The research team included scientists from Teagasc, APC Microbiome Ireland and VistaMilk.
Our contribution was supplying the water kefir cultures used by participants for repeated home and school fermentations. You can read the published methods and our account of that contribution below.
Source: Walsh LH and colleagues (2024), Kefir4All, a citizen science initiative to raise awareness of the roles that microbes play in food fermentation. DOI: 10.1128/jmbe.00155-23.
Our in house cultivation trials record changes in grain weight, temperature, fermentation time and visible separation. During the development work, we also measured pH to understand fermentation progression.
These are practical observations from our own cultures and conditions. Wet grain weights can be affected by retained liquid, so they are not measurements of dry biomass. We use the findings to inform cultivation and troubleshooting.
Explore our milk kefir troubleshooting guide
You do not need a complicated setup. Start with the right grains, a clean jar, the appropriate ingredients and your supplied instructions.
Pick milk kefir grains for dairy milk or water kefir grains for sugar water. Choose a pack size that suits the amount you want to make.
Add the ingredients in the quantities stated in your guide. Keep the jar out of direct sunlight and adjust the timing to your room temperature and culture activity.
Separate the grains from your finished kefir with a suitable strainer. Put the grains into fresh milk or sugar water to begin the next batch.
Answers to the practical questions people ask before their first order.
You can buy fresh milk and water kefir grains directly from NutriBrew at kefirgrains.ie. We grow our cultures in Limerick and ship throughout Ireland and Northern Ireland. Choose your preferred type above, then select the pack size on its product page.
Our milk and water kefir grains are fresh, live cultures, never dehydrated. After delivery, they may need a few regular batches to settle into your milk or water and room temperature. Follow the supplied instructions and contact us if you need help.
No. Genuine kefir grains can be strained and reused with regular feeding and proper care. Keep your grains supplied with fresh milk or sugar water, as appropriate, and follow the storage instructions when taking a break.
No. Milk and water kefir grains are different cultures adapted to different ingredients. Use milk grains for dairy milk and water grains for sugar water. Choose water kefir if your aim is a dairy-free drink.
A clean glass jar, a suitable cover and a strainer are the basics. You also need dairy milk for milk kefir, or water and sugar for water kefir. Our milk guide and water guide explain the setup in detail.
Our milk kefir grains currently start at €14 and water kefir grains at €13, before delivery. Prices depend on pack size. The product pages show the available options and current prices before you order.
Standard untracked delivery is €3.50 for eligible orders up to 500g. Registered tracked delivery is €7 and is required for orders over 500g. Our published processing estimate is 1–2 working days; transit times vary. Check our shipping information for current terms.
Kefir grains can grow with regular feeding, but growth varies between cultures and brewing conditions. Lack of visible growth in an individual batch does not by itself tell you whether fermentation has worked. See our milk kefir FAQs or water kefir FAQs for troubleshooting.
See what customers say about their first batches, repeat orders and the help they received. You can read the reviews on the original platforms or visit our customer reviews page.
Alongside kefir grains, our wider range includes kombucha SCOBYs, yogurt cultures and sourdough starters.
Choose fresh milk or water kefir grains, and we will include the instructions to help you begin.