The coating on aspirin is called an enteric coating.

An enteric coating that covers medicinal pills is a barrier that controls where in the digestive system that the medicine will absorb. Which enteric coating on pills depends on where the medicine should be absorbed such as the stomach or small intestines.

Enteric coated krill oil protects the omega threes from being destroyed from the stomach acid and fishy smelling burps. The disadvantage to this coating is that it can chip off or crack, or the coating may be too thin to be effective. Non enteric coated krill oil products do not protect against stomach acid, and fishy smelling burps are possible, but there is no ingestion of any other chemicals.

Medicines with an enteric coating are safe for sensitive stomachs because the coating prevents heartburn or stomach ache. For a patient with an ulcer, coated aspirin would be the safest kind to take.

Because this would make the enteric coating coating useless and may upset the users stomach. An enteric coated tablet has a material that allows the tablet to pass through the stomach to the small intestine before the medication is released reducing the chance of stomach problems.

Hope this helps. ~J