Omega Yeast | OYL-437 German Lager I + | Beer Yeast | Diacetyl Knock Out Series | Double Pitch | 225 Billion Cells

Omega Yeast | OYL-437 German Lager I + | Beer Yeast | Diacetyl Knock Out Series | Double Pitch | 225 Billion Cells

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  • Diacetyl Knock Out (DKO) is a series of familiar house strains engineered to knock out diacetyl formation before it starts
  • OYL-437 is one of the world's most prominent lager strains
  • Versatile malty profile with light esters at a wide fermentation range
  • Double pitch size with a minimum of 225 billion cells—twice the size of the standard yeast pitch
  • Proprietary propagation methods generate fresh, metabolically strong yeast cells and optimal biomass
  • Omega Yeast is founded on curiosity and innovation, expertly producing common workhorse varieties and many unique strains

One of the world’s most prominent lager strains. Sports a versatile malty profile with light esters at a wide fermentation range. Maintain a more crisp profile by fermenting low or bring out slightly heightened esters at warmer temps (65 – 68°F). Avoid any hints of diacetyl and up your lager game.

Diacetyl Knock Out
The DKO series strains prevent the formation of diacetyl while maintaining the identical fermentation behaviors and flavor expressions of their parental strains. The benefit of ALDC-expressing yeast is that the pathway for diacetyl formation is stopped at the source resulting in virtually no diacetyl production throughout fermentation. When these strains are put to use, the diacetyl levels never reach sensory thresholds. Even when using the most sensitive GC-ECD methods, they stay at the lower limits of detection, giving you peace of mind.


  • Avoid diacetyl hangups with hop creep
  • Boost quality and keep tanks turning quickly
  • Diacetyl so low, it's undetectable

*For sale in the US only. Patent pending.

Attenuation: 73-77%
Flocculation: Medium-Low
Alcohol Tolerance: 9% ABV
Optimum Fermentation Temp: 45-68°F
Cell Count: 225 Billion

Please Note: For best results we Always recommend ordering an Ice Pack with your liquid yeast. Ice Packs can be found below in the "You might Also Need" section.

Please Note: When choosing an ice pack option beware that the liquid yeast will not arrive cold even when shipped together. Ice packs and insulated mailing options are designed to keep the yeast colder for longer during shipment, but they will not ensure that your yeast arrives cold. We will not replace liquid yeast that arrives warm. During warmer months we strongly recommend you choose dry yeast.
Item # OYL437
Shipping Eligible for Free Shipping Program
Availability California - In Stock
Pennsylvania - In Stock
Weight 0.14 LBS

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