Short answer

We found no documented interaction between DIM and L-theanine in the sources below. That isn't proof the combination is right for you: check each one's cautions, and ask your pharmacist if you take medication.

DIM (diindolylmethane)

What it is: A compound formed from vegetables like broccoli and cabbage, sold for estrogen balance.

What the research says: It changes how estrogen is broken down, and lab studies suggest anticancer effects, but human data are limited. There's no evidence for 'detox' claims.

Cautions

• Not for pregnancy, trying to conceive or breastfeeding, because of possible hormone effects.
• Rare reports include vision problems after very high use, and rash.

Medicines to check

• Birth control pills: check with a clinician first
• Many prescription drugs processed by the liver: DIM may make them less effective

In Holitro: DIM (300 mg per capsule)

Source: Memorial Sloan Kettering Cancer Center, About Herbs: Diindolylmethane (updated December 2023)

L-theanine

What it is: An amino acid found in green tea, taken for calm and sleep.

What the research says: Small studies suggest it may improve sleep; results for anxiety are mixed.

Cautions

• No side effects have been reported for the supplement.
• It may not be safe in pregnancy or while breastfeeding.

Medicines to check

• Sleep medicines and sedatives (such as lorazepam, diazepam or zolpidem): may add to drowsiness

In Holitro: Theanine 200mg (200 mg per capsule)

Source: Memorial Sloan Kettering Cancer Center, About Herbs: L-Theanine (updated July 2026)

Check with your doctor or pharmacist, especially if you take medication.

Check your stack — free

Educational information only, not medical advice. This reflects general ingredient overlap, not a personalized safety review. Always check with your doctor or pharmacist before combining supplements, especially if you take medication, are pregnant or nursing, or manage a health condition. These statements have not been evaluated by the FDA.