Mangrove Jack's M12 - Kveik Yeast 10g

Mangrove Jack's M12 Kveik Yeast

Mangrove Jack's M12 is a Voss Kveik-style top-fermenting yeast built for extremely fast fermentation at temperatures that would be far too warm for most conventional ale strains.

It remains relatively clean while contributing subtle citrus character, making it useful for farmhouse ales, pale ales and IPAs when speed or high-temperature fermentation is an advantage.

Yeast Details

• Yeast Type: Voss Kveik-style ale yeast
• Pack Size: 10g
• Suitable Fermentation Temperature: 20–40°C
• Optimal Fermentation Temperature: 30–40°C
• Attenuation: 77–82%
• Flocculation: Very High
• Character: Relatively neutral with subtle citrus notes
• Good For: Farmhouse ale, pale ale, IPA and warm-weather fermentation

How to Use

Sprinkle the contents directly onto up to 23 litres of wort. M12 is specifically designed to work hot, with Mangrove Jack's listing 30–40°C as its optimum fermentation range.

Substitutes

There is no true like-for-like Kveik substitute in our current active dry-yeast range. Mangrove Jack's M44 or SafAle US-05 can provide a clean base for pale ales and IPAs, but both need much cooler fermentation temperatures and will not match M12's speed or heat tolerance.

Brewer's Tip

Do not treat M12 like a normal 18–20°C ale yeast. One of its main advantages is its ability to ferment cleanly and quickly at genuinely high temperatures.