Progesterone - A hormone. May have been taken from the urine of a pregnant mare, and could be used in hormone creams, etc. Rennet - An enzyme taken from the stomach of a newly killed calf. Used in the cheese making process. Silk - Silk Powder.
Silk is the shiny fiber made by silkworms to form their cocoons.
Worms are boiled in their cocoons to get the silk. Used in cloth. Taffeta can be made from silk or nylon. Silk powder is obtained from the secretion of the silkworm. It is used as a coloring agent in face powders, soaps, etc.