Did you know that 100 calories of Bok Choy (also called Bak Choy or Pak Choi) has over four times the amount of calcium than is found in cow's milk? To be exact, 100 calories of Bok Choy (about 5 cups shredded) has 775 mg of calcium, while 100 calories (about 6 ounces) of milk has only 189 mg. Other excellent and healthy sources of calcium include:
Food (100 calories) Calcium (mg)
Turnip Greens 685
Collard Greens 539
Romaine Lettuce 194
From Eat to Live: The Amazing Nutrient-Rich Program for Fast and Sustained Weight Loss by Joel Fuhrman, M.D.
Related: Calcium Supplement Health Risks