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Nitrates are one of a type of drug known as vasodilators, that are used to treat angina in people with coronary artery disease or chest pain caused by blocked blood vessels of the heart. They work to control angina by relaxing the coronary arteries so blood can flow more easily to the heart.
The synthetic substance known as calcium nitrate is a âdouble salt.â Manufacturers produce calcium nitrate by applying nitric acid to limestone, then treating the substance with ammonia.or this purpose, common calcium formulations include calcium citrate and calcium carbonate. The mineral is also readily available in foods such as milk, milk-based foods like cheese and yogurt, tofu, blackstrap molasses and dark, leafy vegetables.