Thuja (Thuja occidentalis)
Photo: Carlos Delgado · CC BY-SA 3.0
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Overview
Thuja (Thuja occidentalis), also called Arborvitae or white cedar, is a coniferous evergreen tree reaching about 33 ft (10 m). Known for potent antiviral, antifungal, and antiparasitic effects, its scale-like leaves (collected in summer) carry a distinct scent due to their volatile oil content (rich in thujone).
Traditional uses & properties
Antifungal & Antiparasitic: Helpful for candida, athlete’s foot, ringworm, amoebic dysentery, and giardia. Antiviral: Leaves can address warts, polyps, and some chronic infections. Emmenagogue & Urinary Tonic: Stimulates menstruation, but used carefully; also disinfects urinary tract. Expectorant: Modestly beneficial for bronchial congestion; used short-term for chesty coughs.
Traditional preparations
Preparation amounts are not shown for this herb. It is toxic, restricted, or otherwise unsafe to self-dose - the margin between a traditional dose and a harmful one is too small to publish as reference material. If you are considering it, that conversation belongs with a doctor or a qualified practitioner, not a website.
Safety & precautions
Pregnancy & Breastfeeding: Avoid; in the 1930s, thuja was used to induce abortion. Prolonged Use: Potential kidney irritation from the thujone content. Essential Oil: Risk of toxicity if taken internally in significant amounts.
Drug & food interactions
Interaction data is not available for this herb - talk to a pharmacist before combining it with any medication. A blank entry here means we have not documented interactions, not that none exist.
Habitat
Native to the northeastern U.S. and Canada, thriving in wet, marshy ground along rivers. The leaves are gathered in summer and dried.
Traditionally used for
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Frequently asked questions
What is Thuja (Thuja occidentalis) traditionally used for?
Traditional sources describe Thuja (Thuja occidentalis) as follows: Antifungal & Antiparasitic: Helpful for candida, athlete’s foot, ringworm, amoebic dysentery, and giardia. Antiviral: Leaves can address warts, polyps, and some chronic infections. Emmenagogue & Urinary Tonic: Stimulates menstruation, but used carefully; also disinfects urinary tract. Expectorant: Modestly beneficial for bronchial congestion; used short-term for chesty coughs.
How is Thuja (Thuja occidentalis) prepared?
Preparation amounts are not shown for this herb. It is toxic, restricted, or otherwise unsafe to self-dose - the margin between a traditional dose and a harmful one is too small to publish as reference material. If you are considering it, that conversation belongs with a doctor or a qualified practitioner, not a website.
What safety cautions apply to Thuja (Thuja occidentalis)?
Pregnancy & Breastfeeding: Avoid; in the 1930s, thuja was used to induce abortion. Prolonged Use: Potential kidney irritation from the thujone content. Essential Oil: Risk of toxicity if taken internally in significant amounts.
Related herbs
Calendula (Calendula officinalis)Calendula (Calendula officinalis), with its bright orange daisy-like flowers, is among the most versatile herbs in Western herbal medicine. Its petals contain antiseptic, anti-inflammatory, and vulnerary properties, making it excellent for speeding tissue repair in wounds, burns, bruises, and various skin irritations. Calendula is also used internally for gastrointestinal inflammation (e.g., Crohn’s disease, colitis, gastritis).
Pau d'Arco (Tabebuia impetiginosa)Pau d'arco is an evergreen tree that can reach 100 feet in height, producing pink flowers. The bark of this South American tree has been treasured for centuries in traditional medicine for its extensive health benefits. Indigenous peoples including the Incas and the Callawaya valued it as a cure-all. The tree grows in both mountainous terrains high in the Andes and in low-lying areas of Paraguay and Brazil. The prized inner bark is collected from wild-growing trees throughout the year.