This book provides a comprehensive review of our knowledge of vitamin B-6 requirements and metabolism throughout pregnancy and lactation. It concentrates on two primary points: adequacy of available methodologies and a presentation of the extant knowledge on vitamin B-6 metabolism and requirements in pregnancy, infancy, lactation, and in women of childbearing age. Many of the chapters offer new perspectives on how decisions have been and are being made with regard to the establishment of dietary recommendations about vitamin B-6 and the adequacy of research to support these decisions.