Western Red Cedar
Important Disclaimer
This is not medical advice. Consult a qualified healthcare provider before using any remedy, especially if pregnant, breastfeeding, on medication, or managing a health condition.
Overview
Western Red Cedar is one of the most culturally and ecologically significant trees of the Pacific Northwest, sometimes called the 'Tree of Life' by Indigenous peoples of the region. While not a true cedar (it belongs to the cypress family), it has been central to Pacific Northwest Indigenous cultures for thousands of years — for canoe building, clothing, medicine, and ceremony. Medicinally, the foliage contains potent antimicrobial and antifungal compounds. IMPORTANT: Contains thujone, which is toxic in high doses. External and inhalation uses are generally safe; internal use requires caution and low doses.
Traditional Use
Western Red Cedar is the foundational cultural plant for many Pacific Northwest Indigenous nations, including the Coast Salish, Haida, Tlingit, Kwakwaka'wakw, Nuu-chah-nulth, and many others. It was used for virtually every aspect of material culture — canoes, totem poles, longhouses, baskets, clothing, and rope. Medicinally, the foliage was burned in sweat lodges for purification and respiratory relief. Leaf tea was used for coughs, colds, rheumatism, and as a general tonic. The inner bark was used for wound dressings and to treat skin conditions. Leaf infusions were applied topically for headaches, swellings, and joint pain. Cedar steam inhalation was widely used for respiratory infections and congestion. The resin was used topically for wounds, burns, and infections. Many tribes considered cedar a sacred, protective plant with spiritual as well as physical healing properties. Midwives used the bark during childbirth. Some tribes used the leaves as a natural insect repellent.
Key Active Compounds
Thujone
CAUTION: A monoterpene ketone responsible for much of the biological activity. Toxic in large doses, causing neurotoxicity and liver damage. Present in the leaves and responsible for the camphor-like scent. External and inhalation use is safe; internal use must be very limited.
Methyl Chavicol (Estragole)
An aromatic ether with antimicrobial properties, contributing to cedar's effectiveness against respiratory pathogens.
Alpha-Pinene and Beta-Pinene
Monoterpenes with bronchodilatory, antimicrobial, and anti-inflammatory properties particularly beneficial for respiratory health.
Plicatic Acid
A lignan compound unique to western red cedar with antifungal properties. Can cause occupational asthma in some woodworkers with prolonged exposure.
Evidence-Based Benefits
Antimicrobial and Antifungal
Some studiesCedar leaf essential oil demonstrates broad-spectrum antimicrobial activity against bacteria including Staphylococcus and various fungi. Used traditionally for skin infections, wounds, and as a general antimicrobial.
Respiratory Support
TraditionalSteam inhalation of cedar foliage has been used for centuries for respiratory infections, bronchitis, and congestion. The aromatic compounds open airways and have antimicrobial effects on respiratory pathogens.
Anti-inflammatory
TraditionalTopical preparations from the leaves and bark used for joint pain, swelling, and rheumatic conditions. The terpene compounds reduce local inflammation.
Wound Healing
TraditionalInner bark and resin used traditionally for wound dressings, burns, and infected skin. The antimicrobial and astringent properties support tissue healing.
Common Preparation Methods
Steam Inhalation (Safe)
Add a small handful of fresh or dried cedar foliage to a bowl of hot (not boiling) water. Drape a towel over your head and bowl and inhale steam for 5–10 minutes.
Dosage: Once or twice daily during respiratory illnessSAFE method. Traditional respiratory remedy. The aromatic compounds open airways and have antimicrobial effects. Keep eyes closed during inhalation.
Topical Infused Oil
Infuse dried cedar foliage in a carrier oil (olive, coconut) for 4–6 weeks. Strain.
Dosage: Apply to affected skin areas 2–3 times dailySAFE topical use for skin conditions, joint pain, and wound care. Do not apply to broken skin. Test on small area first.
Leaf Tea (Limited Use)
Steep a very small amount (1/4 to 1/2 teaspoon) of dried cedar leaves in 1 cup of hot water for 5 minutes. Strain well.
Dosage: 1 cup maximum per day for short periods onlyCAUTION: Due to thujone content, limit internal use to occasional, short-term use only. Not for pregnant women or children. Not for long-term daily use. Prefer steam inhalation instead.
Bark Poultice
Soak strips of inner bark in warm water until pliable. Apply directly to wounds, burns, or infected skin.
Dosage: Apply as needed for wound careTraditional wound dressing material. The fibrous bark makes an excellent natural bandage material. Antimicrobial properties support healing.
Safety & Cautions
Please read carefully before use
Contraindications
- Pregnancy and breastfeeding — thujone can stimulate uterine contractions; avoid internal use entirely
- Epilepsy — thujone can lower seizure threshold
- Kidney disease — thujone is nephrotoxic in large doses
- Children — avoid internal use
- Woodworker occupational asthma — plicatic acid sensitivity
Drug Interactions
- Anticonvulsant medications — thujone may antagonize effects
- Alcohol — thujone toxicity may be increased with alcohol consumption
Possible Side Effects
- THUJONE TOXICITY with excessive internal use: seizures, hepatotoxicity, nephrotoxicity
- Skin sensitization with prolonged topical use in some individuals
- Occupational asthma with prolonged woodworking exposure to raw cedar
- Nausea with internal use of large amounts
Special Populations
- Steam inhalation and topical use are SAFE for most adults
- AVOID internal use during pregnancy — risk of miscarriage
- AVOID internal use in children
- People with epilepsy should avoid internal use
- Short-term, dilute internal use by healthy adults is lower risk
- Consult qualified herbalist before internal medicinal use
Sources & References
Native American Ethnobotany Database
Journal of Ethnopharmacology
Food and Chemical Toxicology
Quick Reference
Cupressaceae
Leaves (foliage), Inner bark, Resin
Aromatic, camphorous, slightly bitter, resinous
Safety First
Always consult with a qualified healthcare provider before starting any new remedy, especially if you have existing health conditions or take medications.