Guide

Allergens in béchamel

Béchamel is milk and wheat. Butter in the roux is milk a second time, and you emphasise milk every time it appears. A gluten-free white sauce needs a different starch, not the same label with the flour crossed out.

Reviewed 23 September 2026 against official guidance.SourcesNot legal advice.

The usual pattern

The sauce is butter, wheat flour and milk, seasoned. Cheese sauce is béchamel plus more milk from the cheese. Mustard in a cheese sauce adds mustard.

What to check in béchamel

What you see	What it means on a PPDS label
Milk	Milk
Wheat flour	Cereals containing gluten
Butter	Milk again
Cheese added	Milk again — emphasise every time

How to write it on the label

PPDS food needs the name of the food and a full ingredients list, with the 14 allergens emphasised every time they appear. The Food Standards Agency’s PPDS guidance is the practical reference. A typical ingredients fragment looks like this — yours must follow the specification of the product you actually use.

Example fragment

Milk, wheat flour, butter (milk), salt, pepper.

Where it shows up

Lasagne, macaroni cheese, fish pie, cauliflower cheese and croque monsieur.

A gluten-free pasta sheet with ordinary sauce

The pasta can be free of gluten and the béchamel still wheat. The portion you pack is not gluten-free.

A cornflour white sauce has no wheat only if you did not use wheat flour. Milk remains.

Specification first

Brands differ. Treat this page as the usual pattern, then match the label to the tub, bag or recipe in front of you.

Questions

Do I list milk once or twice?

Emphasise milk every time it appears — in the milk and in the butter, and again if you add cheese.

Is a cheese sauce just milk?

It is milk and, if you used a wheat roux, wheat. Mustard is extra if you added it.

Official sources

Everything on this page traces back to these. Where they and we disagree, they are right — tell us and we'll fix it.

Introduction to allergen labelling for PPDS foodFood Standards Agency / GOV.UK
Labelling guidance for prepacked for direct sale (PPDS) food productsFood Standards Agency / GOV.UK
Food allergen labelling and information requirements technical guidanceFood Standards Agency / GOV.UK