(1) These active regions often require the presence of a metal ion such as calcium , zinc or iron.(2) The shells are made from calcium carbonate, a compound of calcium , carbon, and oxygen.(3) Some fruit is rich in mineral elements such as calcium , iron and magnesium.(4) If you tend to be susceptible to cramps, try eating more foods that are high in potassium and calcium .(5) If blue hydrangeas are wanted, avoid using fertilisers that are high in calcium .(6) Children need calcium to build bones, and a little fat for energy.(7) You should aim to get 700 mg of calcium each day, which is roughly the same as a pint of milk or two small yoghurts.(8) A dietary factor that increases the loss of calcium from the body is refined sugar.(9) If the hen doesn't have enough calcium , the eggs may be soft shelled and egg binding is more likely.(10) There may be some doubt now about the safety of oestrogen but there is no doubt about the safety of calcium .(11) Dairy products are not the best source of calcium as they cause calcium losses at the same time as providing calcium .(12) Strontium is an element similar to calcium, and follows calcium into teeth and bones.(13) Children who have poor diets and lack sufficient calcium and iron are hurt the most.(14) The bones don't just keep us standing, they're a reservoir of calcium for the rest of the body.(15) Broccoli and almonds are chock full of calcium , but this does not seem to be common knowledge.(16) Because vegetarians eat less protein, they need less calcium to provide the same ratio.