sera was founded in 1970 by Josef Ravnak, a well-respected seller of live pet-food. At this time, a new process called lyophilization was being introduced and was already highly acclaimed for preserving food animals with optimal retention of their nutrients and vitamins. Mr. Ravnak capitalized on this innovation, and over the years has continually improved sera’s product quality through advanced production methods and stringent quality control. Today – more than thirty years later – sera freeze-dried (FD) foods are the refined result of this original process, and they represent an important part of the sera product line.