At least seven brands of acidophilus labelled non-dairy contain undisclosed trace amounts of milk protein that could be dangerous for people with milk allergies, Health Canada said.

Natural Factors Ltd., the packager and labeller, is recalling the brands.

People with milk allergies may react to even trace amounts, and in the worst case, may have breathing difficulties that could become fatal.

One Canadian had an anaphylactic reaction possibly associated with the use of one of the products.

The brands are:

· Truly Premium All Naturals Acidophilus with Bifidus (50 capsules).
· London Naturals Acidophilus with Bifidus (90 capsules).
· London Naturals Acidophilus with Bifidus (180 capsules).
· London Naturals Acidophilus with Bifidus (30 capsules).
· Acidophilus with Bifidus & FOS -- Webber Naturals (180 capsules).
· Acidophilus with Bifidus & FOS -- Webber Naturals (60 capsules).
· Rexall Pro-Biotic (60 capsules).

Acidophilus is a common ingredient in probiotics, which are live micro-organisms that can boost health.