The USA daily recommended intake for calcium is 1,000 mg for adults up to 50 years old, and 1,200 for adults over 51 and older. The UK's recommended intake is 700 mg. Evidence to date does not indicate that vegans have lower calcium needs than non-vegans. Only a few leafy greens are high in absorbable calcium: kale, mustard greens, bok choy, turnip greens, collards, and watercress. If you are not eating at least 3 servings of those foods a day (one serving is 1/2 cup cooked), then you need to be eating calcium fortified non-dairy milk (or another calcium-fortified food), calcium-set tofu, or taking a calcium supplement of 250 - 300 mg/day to ensure you are getting enough calcium. Some research indicates that it is prudent to keep calcium intakes lower than 1,400 mg per day. Calcium supplements are best taken with meals, especially for those people prone to kidney stones.