What's the difference between calcium citrate and calcium carbonate?

Absorption. Calcium citrate and calcium carbonate are calcium supplements which are recommended to people who do not use dairy products. Calcium carbonate is not well absorbed in people who have low amounts of acid in the stomach. Calcium citrate is well absorbed in the absence of acid.

Related Questions

What is better for bones? Calcium carbonate or calcium citrate?

Either ok. Either form of calcium is reasonable to take as a supplement. Choose a form that you won't mind taking as some are definitely more palatable than others. Calcium citrate may be somewhat better absorbed as calcium is best absorbed with some acid. In general, what is more important is to space out your calcium consumption throughout the day as possible since if you take all your calcium at one time it is not well absorbed. Read more...

Is calcium carbonate a better calcium supplement than calcium citrate?

No. No, the only difference is that the former is better taken with food whereas the latter (calcium citrate) can be taken on an empty stomach. Read more...
Depends. While both are common, some find calcium carbonate more constipating and it may not be as well absorbed. Others can tolerate calcium citrate better and it may be better absorbed. The body only absorbs about 400-500 mg at a time so do not dose all at once. Read more...

What calcium supplement should I use, calcium carbonate or calcium citrate?

Either. Just make sure you take the proper amount to balance with your diet and take 2000 units vitamin d3 as well, citrate is easier to absorb and doesn't need to be taken with meals, but can be more expensive and less "calcium dense" per pill. Read more...

Which is a better calcium supplement: calcium carbonate or calcium citrate? Why?

Calcium. Not much to choose from. Go to the drug store and look at the several options for calcium. Carefully read the comments on each one and choose the one you think is best for you. Try focusing on the less expensive end. Read more...

Which is better for bone health: calcium carbonate or calcium citrate? Specifically, which one has a higher chance of causing kidney stones?

Neither. Recent studies have concluded that calcium in any form has no value in building bone or preventing bone loss. Read more...
Calcium. Both of these will supply calcium to your body and kidneys. Calcium citrate is better absorbed than Calcium Carbonate. Calcium citrate supplies citrate, which is helpful, but the amount is very small. Carbonate is not well absorbed so will not affect urine pH. The total mg of calcium matters as well as how much fluid you drink per day and other diet content. Avoid salt, meats, and drink 4 L/day. Read more...