Gulo® Ale Yeast | Omega Yeast OYL-501
Omega OYL-501 Gulo Ale Yeast for High-Gravity, Hop-Forward, Modern Ale Fermentation
Omega Yeast OYL-501 Gulo Ale is a hybrid ale strain built for brewers who want very high attenuation, strong alcohol tolerance, and expressive but controlled ester character in big modern ales. It is especially well suited to double IPA, imperial stout, strong ale, and other higher-gravity recipes where fermentation performance needs to stay aggressive without turning rough or unstable.
Based on current technical references tied to this product, the strain is currently listed at 85% to 90% attenuation, medium flocculation, up to 12% ABV tolerance, and a recommended fermentation range of 68 to 77°F. It is also currently marked phenolic: no, diastatic: yes, and STA1 positive, so brewers should treat it as a strain that warrants careful process separation and sanitation discipline around equipment shared with non-diastatic beers.
What Omega OYL-501 Contributes to Beer
- Very high attenuation: Helps finish stronger beers cleanly and avoid heavy sweetness
- High-gravity capability: Useful in beers that need strong fermentation performance and reliable finish
- Modern ale flexibility: Fits hop-forward ales, strong ales, and bolder specialty recipes
- Expressive but controlled profile: Can support citrus and fruit character without muddying the beer
Omega OYL-501 Specifications
- Attenuation: 85% to 90%
- Flocculation: Medium
- Alcohol tolerance: up to 12% ABV
- Fermentation temperature: 68 to 77°F (20 to 25°C)
- Phenolic: No
- Diastatic: Yes
- STA1: Positive
Best Styles for OYL-501 Gulo Ale
- Double IPA
- Imperial Stout
- Strong Ale
- Other high-gravity hop-forward beers
Why Brewers Choose OYL-501
This strain is a strong option when a brewer wants high attenuation and robust fermentation performance in bigger beers without defaulting to a bland neutral profile. It works especially well in recipes that need both power and balance.
Liquid Yeast Storage and Shipping
We store liquid yeast in temperature-monitored refrigeration to help protect yeast health until shipment. Once in transit, weather and carrier handling are outside our control, so liquid yeast customers should choose shipping protection based on season, destination, and transit time.
Expedited shipping, insulated mailers, and ice packs can materially reduce risk for liquid yeast during warm-weather transit. Dry yeast is generally much less risky to ship than liquid yeast.
Related Yeast and Brewing Resources
Browse our full Omega Yeast collection for more ale, Belgian, and specialty strains. You can also review our yeast shipping best practices page before ordering liquid yeast in warmer weather.
If you want a strain built for big hop-forward or high-gravity ales with strong attenuation and modern fermentation performance, Omega OYL-501 Gulo Ale is a strong choice.