The Underground Railroad was neither underground nor a railroad. It got its name because its activities had to be carried out in secret, using darkness or disguise, and because railway terms were used by those involved with system to describe how it worked.
Hydrolyzed collagen is collagen that is derived from bovine bone and cartilage. Usually, the bone is crushed, ground, defatted, soaked in acid to remove the calcium, soaked again to break the collagen bonds and then dehydrated.
What is hydrolyzed vegetable protein? It's a flavour enhancer used in processed foods like soups, chili, sauces, gravies, stews and some meat products like hot dogs. It's in some dips and snacks like potato chips and pretzels. You'll also find it in some mass-produced vegetarian products made of soy. Hydrolyzed vegetable protein (HVP) is produced by boiling foods such as soy, corn, or wheat in hydrochloric acid and then neutralizing the solution with sodium hydroxide. The acid breaks down the protein in vegetables into their component amino acids.