Final answer:
Glands can produce inedible by-products such as bile, digestive enzymes, and sweat.
Step-by-step explanation:
When discussing glands, there are various inedible by-products that can be produced. For example, the liver, which is the largest gland in the body, produces bile as its main digestive function. Other inedible by-products include the waste products and toxic substances broken down by glands such as the pancreas, which secretes digestive enzymes, and the gallbladder, which stores and concentrates bile. Additionally, glands on the skin can produce sweat as an inedible by-product.