Herbarium of the Ancients — Detailed Record

Frangula californica

Please read before use: the information below describes traditional and informational uses — it does not replace the advice of a healthcare professional. In case of doubt, pregnancy, breastfeeding, ongoing treatment, or use in children, seek advice before use.

Enhanced precautions for this plant: Fresh bark is highly irritating to the digestive mucous membranes and causes severe cramps and diarrhea; it must be dried and aged for at least one year before any traditional use. Internal use is not recommended during pregnancy, breastfeeding, in children, or in cases of inflammatory bowel disorders (colitis, Crohn's disease). Prolonged use beyond a few days may lead to bowel dependency and potassium loss; advice from a healthcare professional is essential before any use. Possible interactions with cardiac medications, diuretics, or anticoagulants; avoid without medical supervision.

Decoction — Bark dried and aged at least one year

Aged bark decoction

Traditionally, a small piece of aged bark was gently boiled in water for a few minutes, then left to steep before straining. This preparation, reserved for occasional and supervised use, should not be repeated without professional advice. Dosage must be validated with a healthcare professional or recognized pharmacopoeia before use.

Tincture — Dried and aged bark

Bark tincture

The bark was sometimes macerated in alcohol for several weeks to obtain a concentrated tincture, used in very small quantities. This concentrated form increases risks and requires prior consultation. Dosage must be validated with a healthcare professional or recognized pharmacopoeia before use.

Where to find it

Obtaining the plant

California buckthorn is found wild on wooded and humid slopes of the North American Pacific coast; prepared bark is sometimes available in specialized herbalist shops, under regulatory control.

Harvest season

When to harvest

The bark was traditionally harvested in spring or autumn, then had to be dried and aged for at least one year before any use.

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