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The strength of vinegar is measured by the percent of acetic acid present in the product. All vinegar sold in the United States at the retail level should be at least 4% acidity as mandated by the U.S. Food & Drug Administration (FDA). Typical white distilled vinegar is at least 4% acidity and not more than 7%. Cider and wine vinegars are typically slightly more acidic with approximately 5-6% acidity.
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http://www.versatilevinegar.org/faqs.html
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Relief from Heartburn
For relief of heartburn or acid indigestion, take one or two tablespoons of balsamic vinegar.
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I admit, I have never heard of that before but there you go. Learn something new everyday.
http://www.versatilevinegar.org/usesandtips.html#4