diarrhea, and mouth and throat irritation by reducing swelling (inflammation). There is some evidence that the chemicals found in bilberry leaves can help lower blood sugar and cholesterol levels.
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Bilberry leaf probably isn't safe for most people when taken in high doses or for a long time. If you have diabetes, keep in mind that bilberry leaf might lower blood sugar. Monitor your blood sugar closely.
Do not use bilberry in medicinal amounts if:
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You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.