Not necessarily. The AAFCO defines byproducts as "secondary products manufactured in addition to the principal product or service." Pet food advertising and marketing generally portrays byproducts as undesirable and unappetizing, but appropriately processed byproducts are Risk-free and nutritious. One example is, liver is usually a byproduct stuffed with natural vitamins https://fish-food20111.blazingblog.com/28811931/pet-supplies-dubai