Swiss retail giant Migros has extended its range of products for allergy sufferers, with the introduction of lactose-free milk, butter and ham lines.

The products have been validated by aha!, the Swiss allergy research centre and all carry the aha! logo.

Migros has been selling products for allergy sufferers since 2005 and by the end of the year, there will be about 40 non-allergic products.

The aha! quality mark, already established on some Migros cosmetics, will be extended to gluten-free products later this year.