I drink milk AND take Caltrate calcium pills with vitamin D and minerals.
Plus, I jog mostly on a treadmill, do weights for my quads and hamstrings and calves twice a week and wear Sorbothane UltraSole insoles. The next time I buy running shoes it will be a pair of Brooks Adrenaline with the hydroflow inside.
mix it up.
running on concrete (sidewalks) is pretty bad. some cities have boardwalks made with ceramic tile - i think it's even harder than concrete. asphalt (road) is better. much softer. especially on a hot day. you get a little bounce back from it.
it's a good idea to try to put in a few days a week on the soft stuff if you can. dirt roads, trails, golf course, or even some miles on the track.
but it's true that there is an adaptation benefit to be derived from doing some miles on concrete or asphalt.