Can I take Methyl B-Complex with Theanine?

Understanding the interactions, benefits, and safety of combining these two powerful supplements.

Methyl B-Complex
+
Theanine

Short answer

We found no documented interaction between B-complex 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.

B-complex (active forms)

What it is: A mix of B vitamins in their active forms.

What the research says: B vitamins help turn food into energy and keep blood and nerve cells healthy; a supplement helps if your diet falls short.

Cautions

  • High-dose folate can hide a vitamin B12 deficiency.
  • Taking a lot of vitamin B6 for a year or more can cause nerve damage.
  • Niacin at 30 mg or more can cause flushing and itching.

Medicines to check

  • Methotrexate: folate can interfere with it
  • Anti-seizure medicines (folate and vitamin B6 notes)

In Holitro: Methyl B-Complex

Sources: NIH Office of Dietary Supplements: Folate: Fact Sheet for Consumers (updated November 2022); NIH Office of Dietary Supplements: Vitamin B6: Fact Sheet for Consumers (updated June 2023); NIH Office of Dietary Supplements: Niacin: Fact Sheet for Consumers (updated March 2021)

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.

Stop Guessing Your Dosages.

Balancing dosages across multiple different bottles is risky, inefficient, and expensive. Methyl B-Complex is already lab-dosed in our Mood Support Pack, and Theanine is in our Sleep Pack — either way, that’s one less bottle to manage.

Shop Mood Support Pack