Food Label Question in Gluten-Free Foods, Products, Shopping & Medications Posted November 15, 2010 · Report to Admin Skylark: Your post has me confused. I was led to believe that maltose was barley sugar. You see maltose as a sugar in a lot of Asian sweets in Asian markets. Do food labelling laws have to declare wheat if it's derived from wheat in the US? Which, of course, doesn't help if it's made of barley. If maltose is an ingredient alone and it does list wheat is it safe? Does the fact that it's paired with corn make it corn.