5 Answers

Not sure, they keep changing the rules. Too much calcium isn't healthy though. Can cause stones......

And yes, pain in knees or back typically go away when they get what they need and Omega 3 with Omaga 6 is very efficient in removing pain instantly if you take a tsp every day and don't forget it. But not fish oil - it is a derivative and is harmful - can cause brain damages and inflammation, especially in the stomach, so get any plant oil like hem poil or flax oil and then maybe some other organic oils too. Get some different ones, but not olive oil is not necessary.

You can read Brian Peslins book on cancer to see fish oil is not so healthy as they say, and Chinese herbalists say the same.

If it is plant calcium or silica as in diatomaceous earth. And to build new bone mass you need additionally at the same time as those things, plant derived  trace minerals from Willamette Valley and cow or chicken bone cartilage in capsules. And don't stop when symptoms are gone. Continue at least another 4 months, so all in all maybe 6 months or more.
To help your back also do an Atlax Profilax - which is to get the atlas bone in place and can only be done by a specialist trained in this particularly. Your doctor will probably tell you it is in place when it is not.

Because you need plant derived minerals and calcium, not metallic ones that get stuck outside organs and are no good.

Get diatomaceous earth and magnesium chloride and go get an atlas profilax done on your neck.