Hi irenem,
The best prevention, for osteoporosis, starts in childhood. If you start early with weight-bearing exercise, calcium and D, you are more likely to prevent it. Some additional vitamins recommended for our bones are vitamin K, B, magnesium, potassium and vitamin C. A healthy life style and avoidance of things that cause bone loss, like smoking, can help you to prevent osteoporosis.
Good luck...
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