Ancient Herbarium — Detailed EntryFR · EN
sweet birch
Betula lenta
Read before use: the indications below describe traditional and informational uses—they do 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: Contains natural salicylates: avoid in case of aspirin allergy, bleeding disorders, before surgery, or during pregnancy and breastfeeding. Never give to children, due to the risk of Reye's syndrome associated with salicylates. The essential oil extracted from the bark is highly concentrated in methyl salicylate and can be toxic even in small amounts when taken internally or applied undiluted to the skin; its use is not recommended without supervision by a qualified professional. Seek the advice of a healthcare professional before any internal use, particularly if taking anticoagulant or anti-inflammatory medication.
Decoction — Bark
Bark decoction for external use
Gently boil pieces of dried bark in water for about fifteen minutes, allow to cool, then use as a compress on the affected area. Do not ingest without professional advice. Dosage must be validated with a healthcare professional or recognized pharmacopoeia before use.
Infused oil — Bark
Bark infused oil
Crushed bark is infused cold or warm in a vegetable oil for several weeks, then filtered, for use as a local rub on painful areas. A professional should be consulted before any regular use due to salicylate content. Dosage must be validated with a healthcare professional or recognized pharmacopoeia before use.
Infusion — Bark
Light bark tea
A small amount of dried bark is briefly infused in hot water, according to North American folk uses; this preparation remains reserved for occasional use and should be discussed with a healthcare professional given the presence of salicylates. Dosage must be validated with a healthcare professional or recognized pharmacopoeia before use.
Where to find it
Sourcing the plant
Sweet birch bark can be found at certain herbalist shops specializing in North American plants, more rarely cultivated outside its native forest range.
Harvest season
When to harvest it
The bark is traditionally harvested in spring, when the sap rises and it separates more easily from the wood.
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