Twinlab Cal-Quick -- 16 fl oz

What the brand says

Twinlab Cal-Quick Liquid supplement contains liquid calcium from natural oyster shells. Twinlab Cal-Quick is a natural, quick acting and pleasant tasting liquid calcium supplement. Twinlab Cal-Quick Liquid is the highest potency, calcium supplement available. There is more calcium in 1 serving of Twinlab Cal-Quick than in 1 quart of milk. Calcium is essential for the formation of strong and healthy bones. Vitamin D improves calcium absorption. Liquid calcium is absorbed faster than hard calcium tablets. Twinlab Cal-Quick goes to work quickly in the stomach. Calcium tablets, on the other hand, need binders to hold them together. Naturally, these binders resist dissolving. So it is possible for a calcium tablet to pass through the digestive tract without being completely absorbed. Twinlab Cal-Quick, however, is specially designed for rapid assimilation and maximum absorption of calcium and vitamin D.