Welcome @rabbits55, I too had heard that strontium is not advised for treating bone health. Here's some information on the topic from The Bone Health & Osteoporosis Foundation.
-- Why Strontium Is Not Advised for Bone Health: https://americanbonehealth.org/medications-bone-health/why-strontium-is-not-advised-for-bone-health/.

Have you found something that helps you build better bone health?

@rabbits55 ..presently looking at how to do good supplements,….combos don’t quite match my criteria, so I’m checking separate supplements…it’s a huge job…too bad there isn’t better medical guidance, so most of us are on our own…in addition to my own research, I’m using this portal for benefits from others’ experiences. And hope the share the best of what i find.

@rabbits55
New Chapter calcium supplements (which I take) does not "add" strontium. Their calcium is plant based from algae and the strontium in their tablets is naturally occurring in the algae. The amount of strontium per dose is only a trace amount of 5.5mg. Search Assist on-line says: "5.5 mg is a small measurement, often used to quantify medication dosages or nutritional values. It is equivalent to 0.0055 grams, which is a very tiny amount in practical terms."

I checked into AlgaeCal regular calcium pills. Their bottle doesn't list the strontium content, but when I contacted the company they said the amount of strontium is also very small and comes from the algae and the amount varies depending on the algae that is sourced. I believe they have another calcium supplement that contains added strontium.

@rabbits55 I'm old enough to remember back in the 50s we were warned one summer not to drink milk, because it contained strontium 90. The Russians were testing the A bomb and the fall out was in the wind and drifted across the US. Also I am leery of folks who are offering advice and also selling supplements. I am 86 and attend a Pilates class 2 x a week. I am adding resistance training to that which is good for bone building. Check with your doctor first. I have tried Fosamax, Reclast infusions, & 1 Prolia shot. Unfortunately, the side affects were too hard to handle. I take Calcium and D3 in the amounts my doctor suggests. Recently I have added Prunes for additional natural calcium. I sneak in as much vitamin K as I can. I'm on blood thinner and have to watch the K. Good luck to you.