Correction to: Nature Metabolism https://doi.org/10.1038/s42255-018-0009-4, published online 7 January 2019.

In the version of this article initially published, in ‘NAD+ and NMN measurements by HPLC’ in the Methods section, the units for the dimensions of both HPLC columns were listed as ‘cm’, whereas ‘mm’ was correct. The error has been corrected in the HTML and PDF versions of the article.