Calcium supplements usually come in 500 to 600 mg tablets. You don’t absorb large doses of calcium as efficiently as you do small ones. Therefore, tablets over 600 mg is a waste of money. Our bodies can effectively absorb approximately 500 mg at a time and that is why it is recommended to take your calcium supplements in divided doses.
Calcium in most supplements is either in the form of calcium carbonate or calcium citrate and in some cases calcium gluconate. Research shows that they are absorbed equally well with meals, but calcium carbonate is harder to digest than calcium citrate and calcium gluconate. People are usually advised to take calcium carbonate with or soon after a meal. Calcium citrate and calcium gluconate can be taken at any time.
Getting enough calcium is a definite must where bone-building is concerned. Calcium is vital for strong bones and is the key ingredient when it comes to bone-building. But many of us don’t get nearly enough calcium.
When choosing a calcium supplement, it is important to choose wisely. Many calcium supplements state how much calcium is in the tablet but this number does not always reflect the true elemental calcium. When a physician recommends that you need 600mg of calcium per day, he/she is referring to elemental calcium. This is also true when you see recommended daily allowance (RDA). The RDA refers to elemental calcium.
In simple terms, this is the amount of calcium that is available to actually work in your body. If you use calcium supplements, it’s wise to read the labels carefully! Just because the label says the calcium supplement has 600mg, it does not always mean that this is the amount of elemental calcium in it. Often the label will list the elemental calcium; other times it’s not mentioned. So to be sure you're getting the calcium you need, it makes sense to know what percentage of elemental calcium is in the different forms of calcium available.
It is confusing when choosing a calcium supplement. There are so many out there all purporting to do the same thing, but there are differences between the different forms.