Research has shown that walking with a weighted vest can help build bone density. If you walk for exercise anyway this is a great way to burn more calories also. Personally, I would never take any of these bone building drugs that are on the market now. They are associated with all kinds of serious side-effects and my understanding is that even though they may build bone the new bone is actually more brittle and therefore you are not really protected from fractures.
The research also shows that jumping on a rebounder while wearing a weighted vest provides even more benefit ( I have a very good rebounder on my site called the Cellerciser. Go to my home page and click on the link for more data). Apparently this is what NASA used to combat the problems of the weightlessness of space (weighted vest and rebounding).
Not all weighted vests are created equal. The weights need to be positioned up high near the shoulders and there are just not any on the market that I could find that fit this specification so I had mine made. Mine is made of cloth and you can remove or add weights which is nice because when you first start wearing it you will probably want to start out light and then add weight. The woman who made mine is a good friend and she can make you a custom vest also. Her name is Arnell and her phone number is 727-595-7597. You can also e-mail her at Artof Eating@hotmail.com This is a superior product and I have been very happy with mine.