* More information on oak side effects Oak toxicity and hazards Oak leaves and fruits (acorns) Toxic principles : rich in tannins The major toxicity of oak is given by the high tannin content of the bark (up to 20%), which is present in smaller proportions [botanical-online.com]

• Suggestibility

  Since these results suggested a crucial role of the feed restricting period, a third experiment was conducted administering the same amount of young OL as in Experiment 1, but adding the severe feed restricting period as in Experiment 2. [ncbi.nlm.nih.gov]

Treatments for internal use should not be prolonged for more than 4 days. External use application should not continue more than 15 to 20 days. Essential oil baths should not be performed when the patient has infections, fever or heart problems. [botanical-online.com]

These preparations should be taken after meals to prevent digestive problems, while respecting the patterned dose. Oak should never be taken in case of gastritis or digestive ulcers. [botanical-online.com]