@blueberre
Well let's cover this one by one:
Firstly, strontium ranelate vs strontium citrate and other strontiums and how to view the research. Strontium is the only part of those compounds that has ever been tied to bone health. The ranelate, citrate etc are additives attached to the strontium for various reasons. The ranelate is attached so the company may patent the product. So if you look at side effects you need to look at the ranelate, citrate etc additives but if you look at bone health you need to view the strontium research. So basically all strontium research is bone research for all of strontium.

Secondly, Strontium Ranelate and the now notorious one population study that caused cardio concerns. If you are familar with research then you know that population studies are not the best way to draw conclusions about any drug. There are frequently no hard standards, just self reporting and no control groups. So that one study taken in an older more fragile population of people using strontium ranelate showed a higher rate of cardio event. Showed a higher rate of cardio events in a population of existing heart patients which were not excluded. Recognizing the problems with that study, Denmark and the UK conducted their own more controlled population study with both lasting for over a year I believe (ck the research links which I provided). They found no increased risk of cardio events linked to strontium in all subsequent studies. So many consider that original study poorly performed and an outlier.

Next, strontium citrate testing etc. First, strontium citrate is found in most of the world's gound water and seafood. Think of it like calcium which it closely resembles, but used at therapeutical levels for us with osteoporosis. But yes, no supplement is ever going to be studied the way that a pharma drug is. Still, there are several studies on just strontium citrate, and they show good results. The Inspire links will give you lots of this research.
Does strontium work? Well my dexa tech tells me that I am one of only 2 people which she has seen in 20 years that no longer have osteoporosis. in addition, I have no side effects and no fractures. My recent dexa taken 2025 December, showed normal bone density and normal TBS or bone quality.
If you go on Inspire you will find a community of us with the same results.
I do believe because strontium citrate works in a more "natural" way than pharm drugs that strontium citrate does best with osteoporosis cases that aren't as drastic as some. But we have people on Inspire who were suffering spontaneous fractures from pharma drugs that have used strontium citrate with good results.
My endocrinologist released me years ago saying that I no longer needed him, but he warned me to change nothing. I have never known a doctor to tell a strontium user after seeing their good results to go off of strontium.
I do wish that there were more studies also.