This vitamin C made a significant difference for me. I believe I had a mild case of pneumonia. After a week of taking it, my awful cough disappeared. However, while out of town and forgetting my vitamins, I purchased another brand, and my cough is returning.
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After switching to Doctor's Best Vitamin C two years ago, my flu occurrences have decreased. I previously had a flu every month, always ending with a lingering cough. Now, I experience minor flus once or twice a semester, lasting just a day and a half without any residual cough.
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