What is DIM and does it help with estrogen?

DIM (diindolylmethane) is a compound from cruciferous vegetables like broccoli, sold as a supplement claimed to help the body process oestrogen — but the human evidence is limited.

DIM forms when you digest cruciferous vegetables (broccoli, cabbage, kale, Brussels sprouts), and in the lab it influences how oestrogen is metabolised, nudging it toward “friendlier” breakdown products. That's the basis for marketing it for “estrogen balance,” PMS, hormonal acne, and menopause. The problem is that most evidence is from test-tube and animal studies; good human trials are scarce, so the real-world benefits and the right dose are genuinely uncertain. It's not a hormone itself, and it won't replace HRT.

It's generally considered safe at typical doses, though it can occasionally cause headaches or change urine colour, and it may interact with some medications.

What to do: the most reliable way to get DIM's potential benefit is simply to eat more cruciferous vegetables — a genuinely good habit regardless. If you want to try a supplement for hormonal symptoms, treat it as experimental, choose a reputable brand, and check with your doctor first, especially if you take medication or have a hormone-sensitive condition. For real menopause symptoms, proven treatments do far more.