Omega Yeast - OYL-605 - Lacto

Lacto OYL-605 is Omega’s clean lactic acid bacteria for kettle souring. It produces straightforward, bright tartness without the funky or buttery off-notes you can get from wild cultures. Blend of L. brevis and L. plantarum.

Best For Kettle-soured beers, sour IPAs, goses, berliners, and any beer where you want clean lactic acidity.

Hard Specs

• Liquid bacteria — requires fast shipping* (see Important Shipping Notes below)
• Temperature Range (souring): 68–95°F - Do not exceed 95°
• Alcohol Tolerance: N/A (use before fermentation)
• More tech specs

Flavor Behavior Clean lactic acid production. Bright, straightforward tartness with minimal off-flavors.

In Practice Pitch into unhopped or very lightly hopped wort (under 2 IBU). Hold at 68–80°F for 24–48 hours until desired sourness is reached, then boil as normal and ferment with your chosen yeast. Works well for quick kettle sours and plays nicely with most hop-forward styles.

Pitching One 100 mL pack sours 5 gallons. Pitch directly into cooled wort before boiling. No rehydration needed.

Important Shipping Notes During warm weather, liquid bacteria ships separately from the rest of your order. Yes, even Lacto. We use minimum USPS Priority Mail (1-3 days) with 2-day and overnight options available. See our full liquid yeast shipping policy for current cutoff times and heat mitigation details. Not applicable to pickups.