The discovery that many baby foods packaged in glass containers with twist-top lids contained semicarbazide (a possible cause of cancer, liver damage, miscarriage and birth defects) sparked an investigation by the European Food Safety Authority. The focus was on organic chemicals in the rubber seals which, when sterilised by heat treatment, may mutate into semicarbazide.

Although The UK Food Standards Agency (FSA) stated that the risks were "very small" (ed.- Again!), the food industry has begun to explore safer alternatives (but warns that the search may take some time).