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Additional information Peer review information Nature Metabolism thanks Dominique Langin and the other, anonymous reviewers for their contribution to the peer review of this work

If you experience severe abdominal pain, persistent vomiting, signs of an allergic reaction, or anything that feels unusual, contact your primary care physician first , as they have your full medical history and can provide appropriate guidance

Blood 1998;92:1191-1198

These syringes are marked in 'units' rather than milliliters

GLP-1 stands for glucagon-like peptide-1

Use NAD+ only within qualified research facilities under appropriate institutional oversight