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M41 Belgian Ale Yeast

Dry Ale yeast from Mangrove Jack's.

LabMangrove Jack's· Ale · Dry · M41

Specs

Attenuation
82–88%
The share of sugars the yeast ferments out. Higher attenuation means a drier, stronger beer.
Optimal temp
18–28°C
64–82°F
The range where this strain ferments cleanly, without throwing off-flavors. Most brewers pitch near the low end.
Flocculation
Medium
How readily the yeast clumps together and drops clear once fermentation winds down.

Genetic traits

Phenolics
POF+
Clove & spice
Throws phenolics — the clove and spice notes (4-vinyl-guaiacol) behind hefeweizens, witbiers, and saisons. Expect a spicy character, not a clean one.
Diastatic
STA-1+
Finishes bone-dry
Carries the STA1 (diastaticus) gene, so it keeps eating sugars other yeast leave behind and finishes very dry. It's also a contamination risk: it can over-carbonate or gush if it crosses into other beers.

Same strain, other labs

BE-134 (Saison Dupont)
M41 = BE-134

Potential substitutes for M41 Belgian Ale Yeast

Usually used in

Belgian Ales

Standard for these styles

Styles where M41 Belgian Ale Yeast is a standard pick — from the corpus, not the guidelines.

Common questions

What is the M41 Belgian Ale Yeast equivalent?
SafAle BE-134 — the same strain from another lab, the BE-134 (Saison Dupont) strain.
What is M41 Belgian Ale Yeast's attenuation?
82–88% apparent attenuation.
What temperature should I ferment M41 Belgian Ale Yeast at?
18–28°C is the recommended range.
Does M41 Belgian Ale Yeast produce phenolics (clove and spice)?
Yes. M41 Belgian Ale Yeast is POF-positive — it makes 4-vinyl-guaiacol, the clove and spice character of hefeweizens, witbiers, and saisons.
Is M41 Belgian Ale Yeast diastatic (STA-1)?
Yes. M41 Belgian Ale Yeast carries the STA1 gene (S. cerevisiae var. diastaticus). It super-attenuates to a dry finish, and can over-carbonate or gush if it cross-contaminates other beers.
What beer styles is M41 Belgian Ale Yeast good for?
Belgian Ales.
What can I substitute for M41 Belgian Ale Yeast?
WLP500 Trappist Ale Yeast (similar temperature range, also phenolic), 1214 Belgian Abbey Style Ale (similar temperature range, also phenolic), and B53 Precious (same flocculation, similar temperature range).
Brew with M41 Belgian Ale Yeast
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