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Vitamin C is the most effective

Oral vitamin B 12 versus intramuscular vitamin B 12 for vitamin B 12 deficiency 22 Background: Vitamin B 12 deficiency is common, and the incidence increases with age

What it is: 5-Amino-1MQ is a research chemical used to study the NNMT enzyme, which is involved in various metabolic processes

*Correspondence: Gunda Herberth, [email protected] These authors share first authorship These authors share senior authorship 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