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Aging can also affect absorption because the body produces less intrinsic factor, a protein needed for uptake

Bausch J

Because DSIP research is largely historical and not industrially funded, it lacks standardized research protocols, making comparison across studies difficult

*Correspondence: Xuemei Tong [email protected] This article was submitted to Cellular Endocrinology, a section of the journal Frontiers in Endocrinology These authors have contributed equally to this work Disclaimer All claims expressed in this article are solely those of the authors and do not necessarily represent those of their affiliated organizations, or those of the publisher, the editors and the reviewers