A popular 'oestrogen balancer' for acne and PMS — plausible mechanism, but honestly thin human proof. Treat as experimental.
DIM (diindolylmethane) is a compound formed when your body breaks down the cruciferous vegetables in broccoli, cabbage and kale. It nudges oestrogen metabolism toward weaker, 'gentler' by-products. That mechanism is why it is widely sold to women for so-called 'oestrogen dominance' symptoms and hormonal acne.
This one calls for honesty. The mechanism is real and there is early data, but solid human trials showing DIM actually improves oestrogen balance, acne or symptoms in women are limited. It is popular and biologically plausible — but not proven. Treat it as an experiment rather than an established treatment, and eat your cruciferous vegetables regardless.
Symptoms attributed to 'oestrogen dominance' (heavy periods, breast tenderness, PMS) or hormonal acne — with realistic expectations.
DIM isn't eaten directly — your gut makes it from a precursor (indole-3-carbinol) found in cruciferous vegetables, so the richest 'sources' are those vegetables themselves: broccoli and broccoli sprouts (the highest), Brussels sprouts, cabbage, cauliflower, kale, bok choy and rocket (arugula). A genuinely cruciferous-rich diet — a couple of good portions most days — delivers these compounds the way nature intended, with fibre and other plant chemicals a capsule can't replicate. One practical tip: light steaming preserves more of the active precursors than prolonged boiling, which leaches them into the water. For most women, eating the vegetables is the sensible first step, with a supplement reserved for those who want a concentrated, consistent dose for specific symptoms.
A common dose is 100–200 mg/day of an enhanced-absorption (bioavailable) product, taken with food.
Take it with a meal. Give it a couple of months to judge any effect on skin or symptoms.
Headache, nausea or gas. A harmless quirk: DIM can turn urine a darker amber or pinkish colour — this is nothing to worry about.
Plenty of cruciferous vegetables (the natural source), plus magnesium.
DIM may interact with the liver enzymes that process medication, so check with your doctor — particularly if you take hormonal contraception or other prescription drugs.
Anyone on hormonal contraception or other medication, pregnant or breastfeeding, or with a hormone-sensitive condition.
An enhanced-absorption DIM (plain DIM is poorly absorbed), third-party tested, at 100–200 mg.
DIM is a reasonable experiment for oestrogen-related symptoms and hormonal acne, but with honest evidence gaps — plausible, not proven. Take 100–200 mg of a bioavailable form with food, and eat your cruciferous veg either way.
Research on DIM and oestrogen metabolism; reviews noting limited clinical trials in women; information on cruciferous vegetable compounds.
These are trusted places to buy. They're affiliate links — if you buy through them we may earn a small commission, at no extra cost to you. We only link to supplements with real evidence behind them.
Based on guidance from the NHS, NICE, Cleveland Clinic and peer-reviewed research.
General information, not a substitute for personal medical advice — always consult your doctor or a qualified health professional before making health decisions. If you are pregnant, breastfeeding, trying to conceive, under 18, or taking medication, speak to your doctor before starting any supplement.