In this article (1), which was published in the November 2009 issue of Cancer Epidemiology, Biomarkers & Prevention, the source of diindolylmethane was not given.

We wish to thank Dr. Michael Zeligs of BioResponse Nutrients, LLC (Boulder, CO) for generously providing the diindolylmethane used in the study.

1
Sepkovic
DW
,
Stein
J
,
Carlisle
AD
,
Ksieski
HB
,
Auborn
K
,
Bradlow
HL
. 
Diindolylmethane inhibits cervical dysplasia, alters estrogen metabolism, and enhances immune response in the K14-HPV16 transgenic mouse model
.
Cancer Epidemiol Biomarkers Prev
2009
;
18
:
2957
64
.