There are lots of fantastic plant sources of calcium. The trouble is that calcium levels aren’t as concentrated in plants which makes it hard to eat enough volume of food to get your full daily need. This is particularly true as you get past 50 years when the recommended intake level goes up.
Calcium is a very large nutrient, so there often isn’t very much of it in a multivitamin. Studies of vegan eating habits show that the average intake of calcium from foods is in the range of 600-700mg per day. If you’re following my meal plans, that’s where my calcium values fall.
The daily recommended intake is 1000mg, so we just need 300-400mg as a supplement. Most multivitamins only include about 50-100mg of calcium, otherwise they would be massive hunks that would be incredibly difficult to swallow. You can make up the difference by taking an additional supplement.