It will help you stand out from the rest of the applicants, but only if you have a good GPA, MCAT, ECs. I majored in chemistry and microbiology and minored in biomedical physics. I made it a point in all my essays to write about how I challenged myself academically by pursuing two majors at the same time while maintaining a good GPA, MCAT, ECs and how I was able to learn a lot about medicine from pursuing these two degrees. As a result, I have been accepted to all the schools that I have interviewed at so far.