The Art of Brewing Non-Alcoholic Beers

The short answer: non-alcoholic (NA) beer is under 0.5% ABV. At home you get there by fermenting as little as possible: brew a light, hot-mashed wort, then either use a maltose-negative yeast that can’t ferment the main wort sugar, or stop a normal fermentation after a few gravity points. Most commercial NA beer is brewed full strength and then dealcoholized with equipment homebrewers don’t have. With little alcohol and plenty of sugar left, NA beer spoils easily, so acidify it, keep it cold and drink it fresh.

Method	How	Pros	Cons
Maltose-negative yeast	A yeast that ferments only the simple sugars (glucose, fructose, sucrose), not maltose	Real fermentation character; stops on its own	Needs a low-gravity wort designed around it
Arrested fermentation	Normal yeast, then chill hard and remove the yeast after a few points	No special yeast	Hard to control; sweet and worty; must stay cold
Low-gravity, hot-mashed wort	Low original gravity, mashed at about 165°F (74°C) so less of the sugar is fermentable	Simple	On its own it gives low-alcohol beer, not NA; combine it with one of the methods above
Removing alcohol	Vacuum distillation or membranes after a full fermentation	Closest to real beer	Needs commercial equipment

The number to watch: under 4 gravity points

Estimated ABV is (original gravity − final gravity) × 131.25. To stay under 0.5%, the gravity can drop by only about 3.8 points. A wort that starts at 1.030 has to finish at 1.027 or higher.

So NA brewing is mostly about the wort, not the yeast. A hydrometer gives you an estimate, not a lab result, so leave a margin and never call homebrew “0.0”. More on the math in our ABV guide.

Designing the wort

• Keep the gravity low. Less sugar means less that can ferment. With a maltose-negative yeast, follow the maker’s suggested starting gravity.
• Mash hot, around 165°F (74°C). At that temperature beta-amylase, the enzyme that makes most of the fermentable sugar, quits quickly and leaves more unfermentable dextrins. See our mash temperature guide.
• Build body with things yeast can’t ferment: dextrin and crystal malts, flaked oats, maltodextrin, or lactose (a milk sugar, so the beer is no longer dairy-free).
• Use hops for aroma. Late and whirlpool hops cover the grainy, worty taste of lightly fermented wort. Dry hop only once the yeast is out and the beer is cold: hops carry enzymes that turn dextrins into sugar, and live yeast will ferment it.
• Plan to acidify. A normal fermentation takes beer down to about pH 4.0–4.5. A barely fermented NA beer can stay above 4.6, so expect to add food-grade lactic or phosphoric acid.

Method 1: maltose-negative yeast

Strains such as LalBrew LoNa, SafBrew LA-01 and Saccharomycodes ludwigii ferment the small share of simple sugars in wort, then stop, because they can’t use maltose.

1. Brew a low-gravity, hot-mashed wort to the yeast maker’s guidance.
2. Chill to the yeast’s recommended temperature and pitch.
3. Take a gravity reading every day. When it stops changing, check that the total drop is under about 3.8 points.
4. Chill it, get it off the yeast, adjust the pH and force carbonate in a keg.

Keep sanitation tight: wild yeast and bacteria can ferment the maltose these yeasts leave behind. See cleaning and sanitizing a fermenter.

Method 2: arrested fermentation

1. Brew the same kind of low-gravity, hot-mashed wort.
2. Pitch a clean ale yeast at its normal temperature.
3. Once fermentation starts, check the gravity every few hours. A few points can go quickly.
4. When it has dropped about 3 points, crash the beer to 32–34°F (0–1°C) and get it off the yeast.
5. Keep it cold from then on. Warmth wakes up the yeast still in suspension.

A jacketed conical makes this practical: cooled with a glycol chiller, a Unitank can be crashed near freezing without moving the beer, and its dump valve removes most of the yeast. Cold slows yeast down but doesn’t remove all of it. See cold crashing.

Removing alcohol after fermentation

Commercial NA brewers usually ferment a normal beer, then take the alcohol out by vacuum distillation (low pressure lets it boil off without cooking the beer) or with membranes such as reverse osmosis. At home the only option is heat. Ethanol boils at 173°F (78°C), so warming finished beer does drive alcohol off, but it also strips hop aroma, gives a cooked flavour and leaves you no way to confirm the final ABV.

Keeping NA beer safe

Normal beer is protected by its alcohol, low pH, hops and CO₂. NA beer has almost no alcohol, often a higher pH and plenty of leftover sugar, so spoilage microbes and pathogens can grow in it. Treat it like fresh juice, not beer.

• Acidify to well below pH 4.6 and check with a calibrated pH meter. 4.6 is the food-safety line below which Clostridium botulinum, the cause of botulism, can’t grow. More in our beer pH guide.
• Keg and force carbonate. Don’t bottle condition: the priming sugar ferments into enough alcohol to push a borderline beer over 0.5%, and live yeast plus leftover sugar can over-carbonate bottles.
• Keep it cold from packaging to glass, at 34–38°F (1–3°C), and drink it within a few weeks.
• Pasteurize it if you want it shelf-stable. Commercial NA brewers do. Heating sealed, carbonated bottles at home can burst them, so for most homebrewers cold and fresh is the safer route.
• If in doubt, pour it out. Gushing, a film on the surface, or sour, rotten-egg or musty smells mean something else is growing.

Frequently asked questions

Can I use a normal recipe with a maltose-negative yeast?

No. These yeasts still ferment glucose and the other simple sugars, and a full-strength wort has enough of them to go past 0.5%. Brew a low-gravity, hot-mashed wort to match.

Why does my NA beer taste like wort?

A full fermentation removes most of the raw, grainy flavours of wort; with so little fermentation, they stay. More late and dry hops, a lower pH, higher carbonation and a very cold serve all help.

Is under 0.5% the same as alcohol-free?

Not always. 0.5% ABV is the usual limit for “non-alcoholic”; labels such as “alcohol-free” or “0.0” usually mean much less, depending on the country.

Is homemade NA beer OK for someone who must avoid alcohol completely?

Don’t rely on it. You can’t confirm the alcohol content at home, and it can rise if the beer warms up or picks up stray yeast.

Related guides

How to calculate ABV, beer pH, mash temperature chart, bottling vs kegging.