### Instruction: You have to Classify each of the following as either a gluten product or a gluten free product and display it according to their categories: sourdough bread, zucchini, barbecue sauce, hummus, amaranth, commercial chocolate milk
### Response: Gluten is a protein found in wheat, barley, and rye. Some people have a gluten intolerance or celiac disease, which means they must avoid gluten in their diet to prevent uncomfortable or harmful symptoms. Gluten-free products are made without these grains and can be a safe alternative for those with gluten intolerance or celiac disease. However, for those without a gluten intolerance or celiac disease, a gluten-free diet may not provide any additional health benefits. 

Here are the those products which are classified as gluten products from the provided list:
1. sourdough bread 
2. barbecue sauce
3. commercial chocolate milk

Here are the those products which are classified as gluten free products from the list provided:
1. zucchini
2. hummus
3. amaranth