DIM (Diindolylmethane) modulates estrogen metabolism via liver CYP enzymes. Complete guide — mechanism, clinical dose (300-500mg), what to look for in a DIM supplement.
DIM (Diindolylmethane) is formed during digestion of cruciferous vegetables. At 300-500mg daily it modulates liver CYP enzyme activity to favour beneficial estrogen metabolites and support a healthier testosterone-to-estrogen ratio in men. Most supplements contain under-dosed 50-100mg.
DIM (Diindolylmethane) is a stable indole formed in the gut during digestion of indole-3-carbinol (I3C) — a compound found in cruciferous vegetables including broccoli, Brussels sprouts and cauliflower. At supplement doses, DIM modulates the liver CYP450 enzyme system involved in estrogen metabolism.
The liver processes estrogen via hydroxylation pathways. Two primary metabolites result: 2-hydroxyestrone (considered beneficial) and 16α-hydroxyestrone (considered less desirable). DIM modulates CYP1A1 and CYP1B1 enzymes to shift metabolism toward the 2-hydroxy pathway — resulting in a more favourable estrogen metabolite ratio.
As men age, adipose (fat) tissue increases in aromatase enzyme activity — converting testosterone to estrogen. This can produce an unfavourable testosterone-to-estrogen ratio. DIM supports estrogen clearance and favourable metabolism, helping to maintain hormonal balance.
Most DIM supplements contain 50-100mg per serving. The clinical dose supported by published research is 300-500mg daily. DIM3X is the only supplement we have reviewed containing the full 500mg clinical dose.