DIM3X supplies 200 mg of DIM daily. We cover what DIM does to estrogen metabolism, the missing testosterone evidence in men, the tamoxifen interaction and other cautions.
Human studies found that DIM (diindolylmethane) at 100 to 300 mg a day changes how estrogen is broken down, and DIM3X supplies 200 mg a day, well inside that range. Most of those studies were in women. DIM3X itself has no trial we could find, and we saw no good evidence that DIM raises testosterone or improves symptoms in men. It can raise SHBG as well, and it interacts with tamoxifen.
The body makes DIM from compounds in cruciferous vegetables like broccoli. Across human studies at 100 to 300 mg a day, the balance of estrogen metabolites moved toward 2-hydroxyestrone relative to 16-alpha-hydroxyestrone. The biggest trial gave 130 women on tamoxifen 150 mg twice daily for 12 months, and it also saw SHBG climb. SHBG binds testosterone, so free testosterone may drop. We found no human trial showing DIM raises testosterone in men.
A daily DIM3X capsule holds 200 mg of DIM, with AstraGin, BioPerine and vitamin E (the label doesn't state AstraGin and BioPerine amounts). A small 2008 dose-finding study found single doses up to 200 mg well tolerated, whereas 300 mg brought extra side effects and no rise in blood levels. Absorption studies of AstraGin and BioPerine, funded by their suppliers, looked at other nutrients, not DIM.
Skip DIM if you take tamoxifen or are being treated for a hormone-sensitive cancer, unless your oncologist approves. Pregnancy, breastfeeding and trying to conceive are reasons not to use it, and it may affect drugs that the liver enzyme CYP1A2 clears. Let your doctor know you take it ahead of hormone blood tests. Darker urine, headache, nausea and loose stools are the usual effects. DIM3X carries a 67-day money-back guarantee, though the official page describes the return conditions inconsistently, so confirm them first.