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Mangrove Jacks M12 Kveik Yeast 10g
M12 is a Norwegian farmhouse kveik strain that ferments cleanly at temperatures that would ruin any conventional ale yeast. At 30–42°C it produces a clean, fast result with very high flocculation, dropping the beer brilliantly clear within 24–48 hours of fermentation completing.
Normally shipped from our Melbourne warehouse within 2 business days (longer in peak periods). Shipping calculated at checkout by weight and postcode.
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Mangrove Jacks M12 Kveik Yeast 10g
Sale price$12.99
The details
M12 is a Norwegian farmhouse kveik strain that ferments cleanly at temperatures that would ruin any conventional ale yeast. At 30–42°C it produces a clean, fast result with very high flocculation, dropping the beer brilliantly clear within 24–48 hours of fermentation completing.
Best Suited To
- Any ale style where fast turnaround or high-temperature fermentation is the priority
- IPA, Pale Ale, Porter, Stout, Farmhouse Ale
- Australian summer brewing without temperature control — particularly Queensland, Northern Territory, and inland Western Australia
Specs
- Fermentation temp: 30–42°C optimal (can work down to 20°C with slower fermentation)
- Attenuation: High
- Flocculation: Very High
- Alcohol tolerance: 15%+ ABV
- Pitching rate: 1 sachet per 23L (under-pitching is well tolerated)
When to Choose M12
M12 is a utility yeast, not a style yeast. Choose it for speed, heat tolerance, or when you lack temperature control — not because it produces a distinctive style character.
For Australian brewers fermenting in a hot garage or shed during summer without active cooling, M12 is the practical answer. At 35–40°C, all other ale yeasts produce fusel alcohols; M12 does not.
Practical Notes
No starter required. Kveik is highly robust and tolerates under-pitching. At 35–42°C, fermentation can be complete within 24–48 hours — take a gravity reading before assuming it is done.
At 20–25°C M12 produces citrus and stone-fruit ester character. At 35–42°C it is nearly neutral — cleaner at high temperatures than you would expect from any other ale yeast.
Keep refrigerated. Once opened, reseal and use within 7 days.
Reviewed by the AHB Brewing Team — June 2026.