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Ingredients to avoid include cinnamon, wintergreen oil and niacin, which can dilate blood vessels.

Ingredients to avoid include cinnamon, wintergreen oil and even niacin, which can dilate blood vessels.

Birch beer is made of its aromatic sap and wintergreen oil is extracted from the leaves.

Add the juice of the lemons and oranges and the wintergreen oil and serve in glasses over cracked ice.

Add the pineapple, orange, and lemon juice, strain, add the wintergreen oil, and freeze.