Informação obtida no Wikipedia.org:

"Hydrolyzed collagen is produced from collagen found in the bones, skin, and connective tissue of animals such as cattle, pigs, horses, and fish. The process of hydrolysis involves breaking down the molecular bonds between individual collagen strands using heat and either acid or alkali solutions.

The hydrolysis process results in reducing the collagen proteins of about 300,000 Dalton (unit) (Da) into small peptides having an average molecular weight between 2000 and 5000 Da."

Vou apenas traduzir o início:
Hydrolyzed collagen é produzido do colágeno encontrado em ossos, pele e tecido cartilaginoso de animais como vacas, porcos, cavalos e peixes...

Não preciso dizer mais nada...