Bilberry fruit and extract are considered generally safe, with no known side effects. However, bilberry leaf and extract should not be taken in large quantities over an extended period of time because the tannins they contain may cause severe weight loss, muscle spasms, and even death.
Who should not take bilberry?
Do not take bilberry without medical advice if you are using any of the following medications:
- insulin or oral diabetes medicine; or.
- medicine used to prevent blood clots, such as clopidogrel (Plavix), dalteparin, enoxaparin, heparin, or warfarin (Coumadin, Jantoven).
How long should you take bilberry?
Bilberry fruit extracts are POSSIBLY SAFE when taken by mouth for medicinal uses for up to one year. Also, a specific combination product (Mirtogenol) containing bilberry and French maritime pine bark (Pycnogenol) has been used safely for up to 6 months.
