Why It's Confusing
Wine is made from fermented grapes, a fully plant-based process. The problem is not the wine itself but what happens during clarification. After fermentation, wine is typically hazy with proteins, dead yeast cells, and tannin particles. Winemakers add fining agents to bind these particles and cause them to drop out of the liquid before bottling.
The most common animal-derived fining agents are isinglass (made from dried fish swim bladders), gelatin (derived from bovine or porcine bones), casein (a milk protein), and egg albumin [[1]](#source-1)[[4]](#source-4). Each attracts different types of particles and is then filtered out before bottling, which means none of it remains in the finished wine.
This is what makes the issue structurally invisible. The fining agents are not ingredients in the traditional sense; they are processing aids that leave no detectable trace. Labelling requirements do not cover processing aids in most countries. Only in the EU are milk- and egg-based fining agents required to be declared, and only because they are allergens, not because of vegan labelling rules [[3]](#source-3).
The result is that two bottles of red wine sitting side by side on a supermarket shelf can have entirely different production histories, one fined with egg whites, one fined with clay, and neither label will say so.
Where It Commonly Appears
Wine appears across contexts where its fining status is impossible to determine at point of service.
- Restaurant wine lists (no fining information provided)
- Hotel minibar and room service wine
- Airline catering
- Supermarket wine (no mandatory disclosure in most countries)
- Wine bars and casual dining
It may also appear on labels as:
- "Contains sulphites", unrelated; this refers to preservatives, not fining agents
- "Allergen: egg" or "Allergen: milk", EU only; signals animal fining was used [[3]](#source-3)
- "Unfined" or "unfiltered", signals no fining agents used; vegan-safe
- "Suitable for vegans" or Vegan Society trademark, explicit confirmation
What To Watch For
On a label: In the EU, allergen declarations for egg or milk confirm animal fining was used [[3]](#source-3). Outside the EU, there is no obligation to declare. Positive signals: "unfined," "unfiltered," "suitable for vegans," or a Vegan Society trademark. Barnivore.com maintains a community-verified database of wine brands by producer [[2]](#source-2).
At a restaurant: There is no practical way to verify at a restaurant unless the wine list specifies vegan status or staff can confirm the producer's practice. Natural wines and biodynamic wines are more likely to be unfined, but this is not guaranteed, confirm with staff or the sommelier before ordering.
Regional variation: Old World wine-producing regions, France, Italy, Spain, have long traditions of using egg whites in red wine production [[1]](#source-1). New World producers in Australia, New Zealand, and parts of California are more likely to use bentonite clay, but no region is uniformly vegan. Kosher wines are processed without isinglass or gelatin, making them a more reliable default, though casein and egg albumin are permissible under kosher law, so this is not an absolute guarantee.
Vegan Alternatives
An increasing number of producers now fine with bentonite clay, activated charcoal, kaolin clay, or plant-based proteins, and some bottle without any fining at all [[4]](#source-4). "Natural wine" as a category tends toward unfined production, though the term has no legal definition and cannot be taken as a guarantee.
The Vegan Society logo, a "Suitable for vegans" statement on the label, or the word "unfined" are the most reliable on-bottle signals. Barnivore.com allows brand-by-brand searches and is frequently updated, verify current formulation before purchasing, as producers change practices [[2]](#source-2).
Supermarket own-brand wines in the UK and Europe increasingly carry vegan labelling. Brands including Blossom Hill and Campo Viejo have confirmed vegan-friendly ranges in certain markets, verify current formulation before purchasing.