Most people don’t require calcium supplementation, particularly when eating Paleo. Meat and green vegetables are rich sources of highly bioavailable forms of calcium.
I would even suggest the reverse, which is that most people get too much calcium. Calcium is actually a cellular poison; if too much calcium gets into a cell, it dies; before it dies, it becomes sluggish and poor-performing. One aspect of arteriosclerosis is arterial calcification, which may be encouraged by having too much calcium.
[[MORE]]Also, since magnesium deficiency is so wide-spread, and because they offset each other in your muscles, supplementing calcium while magnesium is low could cause or aggravate all sorts of problems, including muscle cramps, migraine headaches, blood pressure spikes, etc.
This is true even with osteoporosis: calcium supplementation can do more harm than good (osteoporosis is not a disease of insufficient calcium). One theory of osteoporosis is that excessive calcium can slow down or kills osteoblast cells, which are responsible for building bone. Those cells are apparently affected before the osteoclasts, which break down bone; less effective bone building + continuing bone break down = a net loss of bone.
The above associations with heart disease and osteoporosis are reasons why EDTA chelation therapy, which pulls a lot of calcium from the body, can be an effective treatment for both conditions.
There are of course exceptions, but unless you have a documented need, I would avoid calcium supplements. Getting enough vitamin D is much more important.
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