In 12014 I went onto the Forteo program for 20 months. It took me out of the Osteoporosis classification into bottom line normal. Then I took Algae Cal for years .It worked to a small degree in building my bones. Gradually, I have been going down into the Osteopenia classification. Don't remember numbers. Had to quit taking it due to the magnesium in it. My system did not tolerate it. I found another supplement with almost the same ingredients in it without the magnesium. I have tried eating magnesium with the greens and taking different magnesium's supplements however, I am not improving. I will be 85 years old in a few days. I tried to stay active with weight bearing exercises, walking and my diet, take a lot of diffrent supplements.