@sueinmn from the article I believe the therapeutic dose of 680mg might be up to 200 times what we get from food. Side effects, especially cardiovascular, are a concern. I was however interested in the info in the article on possible benefits of low dose strontium (excerpt below). I still wonder if the 4mg or so that is typical in various supplements has any effect. We need more research!

"Researchers should investigate the possibility that the beneficial effects of high-dose strontium could be duplicated at least in part by much lower “nutritional” doses, such as 2-6 mg per day. The improvement in bone quality that results from the incorporation of strontium into hydroxyapatite crystals likely occurs with small doses of strontium, since strontium is present in the hydroxyapatite crystals of people who do not take strontium supplements. The possibility that low-dose strontium is beneficial is supported by the results of one study, in which the reduction in fracture incidence was nonsignificantly greater with 170 mg per day of strontium than with 340 or 680 mg per day. Whether doses less than 170 mg per day would influence bone mineral density or fracture risk has not been investigated."