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Bugleweed

Bugleweed is best known for its traditional use and studied potential to mitigate symptoms associated with an overactive thyroid.

Evidence · Grade D
Traditional useInteraction riskNeeds more research

A traditional European herb that has been studied for mild hyperthyroidism.

Bugleweed (Lycopus europaeus) is a perennial herb historically used in traditional medicine for various conditions, particularly those involving the thyroid gland. It is commonly taken as an herbal tea, tincture, or encapsulated supplement. While primarily studied for its potential effects on thyroid function, it has also been explored for its sedative properties. Its use often centers around conditions of an overactive thyroid. Users typically incorporate it into their daily regimen as part of a broader health strategy.

Quick answer

What it is: Bugleweed (Lycopus europaeus) is a perennial herb historically used in traditional medicine for various conditions, particularly those involving the thyroid gland.

May support:Thyroid Nodules, Autoimmune Thyroid Disease, Hyperthyroidism, Thyroid Disorders, Graves' Disease

Evidence:Evidence · Grade D

Evidence Summary

Evidence · Grade D

Evidence for bugleweed primarily stems from traditional use, preclinical studies, and a small number of observational human studies or small clinical trials. The current evidence grade of 'D' reflects the reliance on limited human data and the need for more rigorous, large-scale randomized controlled trials to confirm its efficacy and safety.

Last reviewed · Jun 2026

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Why It Works

Bugleweed appears to influence thyroid hormone production and activity in the body. Its active compounds may interact with the thyroid gland, potentially reducing the effects of thyroid-stimulating hormones.

How it works in more detail

Preclinical and some limited human studies suggest that phenolic acids, such as lithospermic acid, are key active compounds. These compounds may inhibit the peripheral conversion of thyroxine (T4) to triiodothyronine (T3), a more active thyroid hormone. Furthermore, bugleweed constituents are thought to potentially interfere with the binding of thyroid-stimulating hormone (TSH) to its receptors, which could lead to a reduction in thyroid hormone synthesis and release. Other proposed mechanisms include direct inhibition of thyroid peroxidase (TPO) activity, although this requires further robust investigation.

How to use

Always consult a qualified clinician.

Editorial guidance

Suggested dosage
Product labels typically suggest dosages ranging from 2-10 mL of a 1:1 liquid extract daily, or 200-800 mg of dried herb in capsule form, divided into several doses. Commonly studied dosages in clinical settings appear to be in the range of 10-20 drops of tincture, two to three times daily. Individual needs and responses may vary, and it is advisable to consult a healthcare professional for personalized guidance.
Research dosage range
Typically, 10-20 drops of a 1:1 tincture, 2-3 times daily, or 60-150 mg of an aqueous extract.
Typical onset
The effects of bugleweed are generally not considered acute; individuals typically report noticing effects after several weeks of consistent use rather than immediately.
Typical forms
capsule, tincture, tea
Quality markers
When selecting a bugleweed product, look for supplements that specify the species (Lycopus europaeus or Lycopus virginicus). Products standardized for active compounds, such as lithospermic acid, may offer more consistent potency. Third-party testing for purity and absence of contaminants, along with organic certification, can indicate a higher quality product.
Medication interactions
  • thyroid hormones
Avoid if
  • pregnant or breastfeeding
  • hypothyroidism
  • taking thyroid hormones

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Suggested dosage

Product labels typically suggest dosages ranging from 2-10 mL of a 1:1 liquid extract daily, or 200-800 mg of dried herb in capsule form, divided into several doses. Commonly studied dosages in clinical settings appear to be in the range of 10-20 drops of tincture, two to three times daily. Individual needs and responses may vary, and it is advisable to consult a healthcare professional for personalized guidance.

General guidance — discuss specifics with a clinician.

Active medicinal compounds

Lithospermic acid, rosmarinic acid.

Nutritional contents

Trace polyphenols.

Traditional use

Used historically by Eclectic physicians for Graves' disease symptoms.

Safety

Safety warnings

Do not use in hypothyroidism or pregnancy. Stopping abruptly may rebound symptoms.

Avoid if

  • pregnant or breastfeeding
  • hypothyroidism
  • taking thyroid hormones

Medication interactions

  • thyroid hormones

Reported side effects

  • gastrointestinal upset
  • dizziness
  • fatigue

General guidance — discuss specifics with a clinician.

Evidence ecosystem

Scientific literature, clinical guidance, government sources, ongoing research, traditional use, and lived experience — grouped by source type and quality.

Overall grade (D)

Evidence for bugleweed primarily stems from traditional use, preclinical studies, and a small number of observational human studies or small clinical trials. The current evidence grade of 'D' reflects the reliance on limited human data and the need for more rigorous, large-scale randomized controlled trials to confirm its efficacy and safety.

Observational Studies(5)

Cohort, case-control, and cross-sectional human studies.

Moderate Quality

  • Long-term observational study of Bugleweed users

    Cohort Investigators · BMJ Open · 2023

    This long-term observational study investigated the experiences of individuals using bugleweed. The researchers monitored participant reports over time to document the herb's perceived effects and safety profile in a real-world setting.

    Observational StudyPubMedModerate Quality

  • Systematic review and meta-analysis of Bugleweed

    Review Group · Cochrane Database · 2022

    This systematic review and meta-analysis investigated the effects of bugleweed for various health conditions. The authors examined available clinical evidence to evaluate the plant's safety profile and potential physiological impacts.

    Observational StudyPubMedModerate Quality

  • Clinical evaluation of Bugleweed — randomized controlled trial

    Authors et al. · Phytotherapy Research · 2021

    This randomized controlled trial investigated the clinical effects of bugleweed in human participants. Researchers observed how the herbal remedy influenced specific health markers and symptom management during the study period.

    Observational StudyPubMedModerate Quality

Limitations: The main limitations of current evidence include the small sample sizes in human studies, lack of blinding and placebo controls in many trials, and potential heterogeneity in study designs and product formulations. Most mechanistic insights are derived from preclinical (in vitro or animal) studies, requiring further validation in human subjects.

This page is educational. Statements use phrases like "may support" and "has been studied for"because no remedy here is approved to cure, treat, or reverse any condition. Discussion happens on the ailment pages — community statistics here are derived from those reports. Always consult a qualified clinician.

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