Casein (Processing Agent) — Hidden Processing Agent — Is It Vegan?

Vegan status: Not Vegan

Also known as: Milk casein, Sodium caseinate, Potassium caseinate, Milk protein fining

Source

The primary protein in cow's milk (approximately 80% of milk protein content). In a processing context, casein is used as a fining agent in wine and cider, and as a binding/adhesive agent in some industrial and craft applications.

Used in

Wine fining (white and rosé wine primarily), some ciders, certain latex paints and adhesives, some paper coatings. As a wine fining agent, it removes oxidative taint and phenolic bitterness.

Appears on label: No. As of 2012, EU wine regulations require that wines treated with casein or egg products declare 'Contains milk' or 'Contains egg' if residues above the detection threshold remain. Many wines are below this threshold and carry no label. Outside the EU, no disclosure is required.

How to avoid

Look for vegan-certified wines or use Barnivore.com. Many winemakers now use bentonite (a mineral clay) or pea protein as vegan fining alternatives. Natural wines are typically unfined and vegan by default.

Notes

Casein is widely used in paper manufacturing — the glossy coating on magazine paper and some cardboard is often casein-based. This is a grey area for many vegans; the scale of avoidance is a personal decision. In winemaking, casein is being replaced by plant-based alternatives (pea protein, potato protein) in sustainability-focused wineries.