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Due to a lack of research on the use of oak bark in humans, there’s no recommended dosage.
Instructions provided on oak bark pills, tinctures, teas, and lotions vary widely.
For better absorption, some instructions suggest not taking oak bark supplements or teas with food.
According to the European Medicines Agency, the following are the generally recommended dosages of oak bark for different purposes — both for internal and external use.
Internal uses
- Oral supplements: up to 3 grams per day
- Teas (for diarrhea): 1 cup (250 mL) of oak bark tea up to 3 times per day, or the equivalent of 3 grams per day
- Duration: 3–4 days
External uses
- Baths (for hemorrhoids or skin irritations): 5 grams of oak bark boiled in 4 cups (1 liter) of water before adding it to a bath
- Skin rinses or gargles (for skin irritations or sore throats): 20 grams of oak bark boiled in 4 cups (1 liter) of water
- Duration: 2–3 weeks
How to make oak bark tea
Oak bark tea is available in loose leaf or tea bag form.
To make it, steep a tea bag in 1 cup (250 mL) of hot water. You can also boil up to 3 grams (3/4 teaspoon) of dried oak bark in a few cups of water, strain, and drink. *
