(KCEN) -- The coating used on some types of aspirin pills could reduce or even eliminate drug's effectiveness in reducing heart attacks and strokes.
That's according to a new study by the University of Pennsylvania.
Researchers looked at 400 healthy people to determine why some people develop what doctors believe to be aspirin resistance.
Instead they found resistance to the medication may not be the problem at all.
The actual coating may prevent aspirin from absorbing in a way that allows it to do its job.