A cup of spinach has about 30 mg of calcium. A cup of milk has about 300 mg. Als...

Turing_Machine on Jan 10, 2017 | parent | context | favorite | on: 'Tooth repair drug' may replace fillings

A cup of spinach has about 30 mg of calcium.

A cup of milk has about 300 mg.

Also, most of the calcium in the spinach is in the form of oxalates, which are not readily absorbed (and if they are absorbed, may contribute to the formation of kidney stones).