Lane Medical 3A Calcium 3A Calcium provides superior calcium absorption and parathyroid modulation. Tiny amount of HAI have been scientifically shown to significantly increase calcium absorption. In one study, the improvement was up to 4X greater. These two patented, natural ingredients are only available in 3A calcium. Recommended Use: 3 capsules in the morning and 3 capsules at bedtime, preferably with food, or as directed by a healthcare professional.