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To date, little is known about the safety of long-term use of blueberry extract supplements. Blueberry is safe to consume in the amounts found naturally in food. However, it is unclear how much blueberry extract is safe to consume.
Blueberry extract may lower blood sugar levels. People who are taking diabetes medications should use caution when using blueberry extract. In addition, stop taking blueberry extract at least two weeks before a scheduled surgery, as hypoglycemia may occur. *
