This groundbreaking work on creatine metabolism, first published in 1926, explores the chemical processes involved in the production and utilization of creatine, a vital compound for muscle function. Sheets was a pioneer in the field of nutrition research, and her work on creatine metabolism paved the way for future discoveries in sports medicine and exercise physiology. This work has been selected by scholars as being culturally important, and is part of the knowledge base of civilization as we know it. This work is in the "public domain in the United States of America, and possibly other nations. Within the United States, you may freely copy and distribute this work, as no entity (individual or corporate) has a copyright on the body of the work. Scholars believe, and we concur, that this work is important enough to be preserved, reproduced, and made generally available to the public. We appreciate your support of the preservation process, and thank you for being an important part of keeping this knowledge alive and relevant.