That was the dose recommended years ago. Since then, strontium ranelate has been banned in the EU. The strontium available as a supplement may or may not also present risk of clots and stroke. But the main problem is that since strontium is heavier than calcium, Dexa scans make bone density look better than it is after that dose of strontium over time. So there is skepticism when someone touts gains in bone density on that regimen. If you are willing to take it and not rely on DEXA, then no problem other than possible side effects (like Pharma meds).

@jbcoobb2380 I do not understand why you responded with this post about timing of strontium relative to calcium. The issue with strontium is that it makes bone density look better than it is, on the DEX scan. (And strontium citrate may have the same possible cardiovascular effects as the ranelate form; that is only speculation since I have not seen studies.)