Sodium citrate is a salt associated with citric acid. It occurs naturally in a variety of foods, including many fruits. It is also an intermediate product of aerobic metabolism in the human body. When consumed in food or produced in the body, sodium citrate quickly degrades into sodium bicarbonate. The most reliable results seem to follow when about 0.5 grams of sodium citrate per kilogram of body weight is dissolved into a liter of flavored water (it’s unpalatable in plain water) and consumed about 90 minutes before racing.