Blueberry Leaf Tea for Diabetes?

I have read that leaf blueberry tea is good for diabetes. does the blueberry tea you can buy at the store have the same effect?

Blueberry leaf helps to regulate blood sugar levels. The dosage is one teaspoon of dried leaf, steeped, covered, in a cup of boiling water for 15 minutes, taken 3 times daily. Check the contents of the packaged "blueberry tea" for "dried blueberry leaf".
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