What's inside
Alcohol, allergens, and nutritional value
12.5% by volume on the label doesn't always mean exactly 12.5% in the glass. The law allows a small tolerance for alcohol, but hardly any leeway for calories and allergens. Three pieces of information, three completely different logics.
Why the alcohol figure has a small tolerance
The alcohol content printed on the label doesn't have to match the later lab value to the decimal point. The EU allows a deviation of up to 0.5% by volume up or down for most wines. The stated figure is therefore still not considered incorrect. A wine listed at 13.0% may thus measure between 12.5% and 13.5% in the lab. No one would need to print a new roll of labels because of that.
This tolerance isn't sloppiness; it accounts for the nature of the drink. Alcohol is produced during fermentation by living yeasts, whose work can't be predicted down to the decimal point. Even after bottling, the value continues to shift slightly through aging. A rigid law with zero tolerance would force winemakers to print new labels constantly whenever the lab reports a tiny fluctuation, an effort that wouldn't have changed anything about the taste in the glass anyway.
Calories: the invisible figure that's now becoming visible
Wine was long considered a drink without a nutrition label, even though it's anything but calorie-free. Since the reform of December 2023, the energy value in kilocalories or kilojoules must be printed on every label. This applies regardless of whether the rest of the nutrition table is printed or only provided electronically. Most of the calories in wine come not from sugar but from the alcohol itself, which is particularly energy-dense.
A dry wine with little residual sugar can therefore surprisingly deliver a lot of calories, simply because the alcohol content is high. A sweet wine with lower alcohol content can sometimes even come in below it, even though it tastes noticeably sweeter on the tongue. Anyone watching calories in wine should therefore look at the alcohol figure rather than the word "dry" or "sweet" alone. Two glasses of the same volume can deliver noticeably different calorie counts depending on the alcohol content.
Allergens beyond sulfites
Sulfites aren't the only possible trigger in a bottle of wine, just the one that's almost always on the label. Some wineries fine their wine using animal-derived aids such as egg white or milk protein. These substances bind cloudy particles and are then supposed to be removed from the wine again. In rare cases, tiny traces remain behind, which could trigger allergic reactions in sufficiently sensitive people.
Because these residues normally fall below the detection limit, an exception applies in practice. Only if measurable protein actually remains in the finished wine does it have to be declared as an allergen. Anyone with a known egg or milk allergy will therefore rarely find a warning on the label. Yet animal protein was indeed involved in the production process. When in doubt, the only real help is asking the producer directly or looking for a vegan seal, which resolves exactly this uncertainty for the buyer.
Alcohol-free and low-alcohol: their own rules
A wine may only be labeled "alcohol-free" in the EU once it contains no more than 0.5% alcohol by volume, exactly the same limit as for alcohol-free beer. This is usually achieved through gentle methods such as vacuum distillation, in which a normally fermented wine is afterward largely de-alcoholized. That's why some labels correctly read "de-alcoholized wine" instead of simply "alcohol-free wine." Both terms nevertheless share practically the same shelf in stores.
For intermediate levels like "low-alcohol," however, there's no equally sharply defined, EU-wide standard figure; the term is handled less consistently than the clear alcohol-free threshold. Anyone who wants to be absolutely sure how much residual alcohol is actually still in the bottle is best off reading the exact percentage right next to the sales designation, rather than relying solely on a marketing word. That number is mandatory, while the word next to it is only a more or less precise description.