Oriental Arborvitae Drug Interactions, Uses, Effectiveness, Safety & More

Oriental Arborvitae (Platycladus orientalis) is an evergreen conifer tree native to East Asia. It is widely planted in gardens and landscapes for its dense, scale-like foliage, but it also has a long history in Traditional Chinese Medicine (TCM).

In TCM, two different parts are used and have different names. The seeds are called Bai Zi Ren and are used mainly to calm the mind and to soften the stool. The leaves and young twigs are called Ce Bai Ye and are used traditionally for bleeding problems and for the scalp and hair.

Today you may find it as dried herb for teas (decoctions), powders, capsules, or in topical products such as hair tonics. It is far more common in TCM practice than as a standalone Western supplement.

The plant contains a mix of natural compounds, including flavonoids, essential oils (with substances such as thujone and other terpenes), tannins, and fatty oils in the seeds.

The fatty oil in the seeds is thought to explain the gentle stool-softening, laxative effect. Flavonoids and other antioxidants found in the leaves may have antioxidant, anti-inflammatory, and antimicrobial actions in laboratory tests, and some lab studies suggest effects on hair-related cell pathways.

Most of these mechanisms come from test-tube and animal research. It is not clear how well they translate to real benefits in people at safe doses.

Safety information for humans is limited, so a cautious approach is wise. The essential oil contains thujone, a compound that can be toxic to the nervous system in larger amounts and may trigger seizures. Concentrated oils and large doses are the main concern.

People with a history of seizures, kidney or liver problems, or those who are frail or elderly should be especially careful. Children should not use it without medical supervision.

Pregnancy: Avoid. It is traditionally avoided in pregnancy, and there is not enough safety data to consider it safe. Breastfeeding: Avoid, because no reliable safety information is available.

Because product quality and the part of the plant used can vary, talk to a pharmacist, doctor, or qualified TCM practitioner before using it.

When the seeds are used in usual food-like amounts, the most common side effects are digestive, such as loose stools, diarrhea, or stomach upset.

More serious problems are linked to the concentrated essential oil or to high doses, and may include nausea, vomiting, dizziness, and—because of the thujone content—nervous system effects such as agitation or, rarely, seizures. Allergic reactions are possible, especially with topical use.

Stop using it and seek medical care if you have a severe reaction, trouble breathing, or any unusual neurological symptoms.

There is no well-established standardized dose for Oriental Arborvitae as a supplement. In Traditional Chinese Medicine, the seeds and leaves are used in specific amounts within formulas prepared by a trained practitioner, and the right amount depends on the part used and the preparation.

If you choose to use a commercial product, follow the directions on the label and do not exceed them. Never ingest the concentrated essential oil unless directed by a qualified professional. When in doubt, check with a pharmacist, doctor, or licensed TCM practitioner first.