Vinegar does have carbs in it, and the amount of carbs varies by type of vinegar. Balsamic vinegar, for example, tends to have many more carbs than straight white vinegar. Check Fitday's food bank under "vinegar" and you'll see that the carb count for one cup is around 15 grams of carbs. Vinegar is made from a sugar-containing material in a two-step process: fermentation and acidification. The word vinegar comes from the French "vinaigre" meaning "sour wine."

Also, as far as calcium supplements go, Calcium Citrate is much more readily absorbed than other forms of calcium, such as Calcium Carbonate. Also, if you take your calcium supplements with a meal, you will absorb more calcium than if you take them on an empty stomach.