I would like to know on what you are basing the claim for Strontium being necessary? Can you give me a reference for that? After the atomic bombs were dropped in WWII, they found on X-ray what looked like bone growth. It was that strontium was hanging out in the bones, making it look like bone growth - sort of the way Reclast, Prollia, Tymlos, and other "bone growth" drugs look like new bone. However, once you stop taking these drugs, the "new" bone disappears. Strontium ratelate is banned in Europe. because it can cause cardiac events. To date, I have found no proof that strontium in any form causes bone growth. This website may or may not be allowed by the moderators - It speaks to the use of strontium: https://americanbonehealth.org/wp-content/uploads/2016/12/BONESENSE-on-Strontium_FINAL.pdf.d. Please let me know if you have something that supports the use of strontium in any form.

Also, please be careful with Silica. You don't need that much of it. If you supplement with silica, be very careful as you can cause kidney damage very easily.

Vitamin K1 works on blood coagulation - not on bones. It is Vitamin K2 (mk4 mk7) that works on bones in humans.

Check your multivitamins and other supplements for copper, manganese, chromium, silica, etc. to see if you are covered. Many vitamins have enough to cover you.

As to boron, if you have osteoporosis, you may not be getting enough from food. Nobody knows how much you need for certain. You could get maybe 3-5 mg by eating a bowl of prunes every day. But if you are taking it for arthritis or fibromyalgia relief - you will need 6-9 mg. The upper limit for boron in the human body is 20 mg/day.

It is best to eat your calcium in food. You do have to allow for things like oxalates which can challenge absorption of calcium. I keep track of how much calcium I got in my food during the day, then only take a supplement for the amount I need to make it to 1,200 mg at the end of the day. Also, bear in mind that you can only absorb 500 mg TOTAL of magnesium and calcium every 4-6 hours.

You should talk to your doctor or nutritionist before you make changes to you diet or before auditing supplements. I have to say that or the moderators will bust me. However, I have not had one doctor yet who knew anything about nutrients and bone loss.

@jakedduck1 Just about all of these things are important parts of a healthy diet, but many do not really need supplementation. Strontium does cause inaccurate results in DEXA scans.
Vitamin K supplementation can help the bones of post-menopausal women, apparently, both K1 and K2 are helpful, per this article:
https://www.webmd.com/vitamins/ai/ingredientmono-983/vitamin-k
As with everything, there can also be too much of a good thing. Too much calcium can lead to Hypercalcemia
"a condition in which the calcium level in your blood is above normal. Too much calcium in your blood can weaken your bones, create kidney stones, and interfere with how your heart and brain work. Hypercalcemia is usually a result of overactive parathyroid glands." taken from the Mayo Clinic site.

Too much magnesium can also have negative effects. Again, from the Mayo site:
https://www.mayoclinic.org/healthy-lifestyle/nutrition-and-healthy-eating/expert-answers/magnesium-supplements/faq-20466270
This is very true of many of the things we need, you often get enough from diet.

Also, I buy wild salmon at least once a week. I just brush a little olive oil on it and bake it in the oven. It is also good with some teriyaki sauce brushed on. Even though I use the lower sodium one it is still a bit high in sodium for me so I don't do that as often. If you leave the skin on, after baking it just slips right off of the fish. It is excellent cooked on the grill too.
JK