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Lactose is a unique milk sugar in brewing: it has the particularity of being non-fermentable. This means that standard brewing yeasts are unable to convert it into alcohol or CO2.
It therefore remains entirely in your bottle to shape the final profile of your beer, bringing a texture and sweetness that malt alone cannot offer.
1. Smoothness and Body: Why use lactose?
Adding lactose is not about alcohol, but about mouthfeel and flavour balance:
- Creamy texture: It changes the viscosity of the beer, bringing that silky, velvety character highly sought after in modern styles like Milk Stouts.
- Residual sweetness: With a subtle sweetening power (about 20% of table sugar), it balances the bitterness of roasted malts or the acidity of fruits.
2. Dosage guide (for a 20‑litre batch)
The dosage varies greatly depending on the style. Here are our recommendations to guide you:
| Intensity | Dosage (20L) | Effect & Styles |
|---|---|---|
| Light | 100g to 200g | Subtle roundness (NEIPA, light Stouts) |
| Standard | 250g to 500g | Balanced Milk Stout, pronounced creaminess |
| Intense | 600g to 1kg | Dessert beers / very indulgent Pastry Ales |
3. How to add it: Boil or Secondary?
- In the boil (Classic): Add your dose during the last 10 minutes. This guarantees full dissolution and perfect sanitation.
- In secondary fermentation (Advanced): For an even “fresher” milky character. Prepare a syrup (lactose + a little boiling water), let it cool, and pour gently into your fermenter.
Rolling Beers Team Tips
Lactose does not ferment: your final gravity (FG) will mechanically be higher (expect around +1.004 to +1.010 points). If you’re aiming for a very sweet beer, don’t forget to slightly increase your bittering hops to maintain balance.