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Is Calcium Citrate Safe?

Most people can safely take calcium citrate, especially at reasonable dosages. However, some people may be more likely to experience problems than others. Therefore, you should talk with your healthcare provider prior to taking the supplement if you have:
  • Achlorhydria (low or absent stomach acid)
  • An overactive parathyroid gland (hyperparathyroidism)
  • High phosphate levels in the blood (hyperphosphatemia)
  • Low phosphate levels in the blood (hypophosphatemia)
  • Kidney disease, such as kidney failure (renal failure)
  • Kidney stones
  • Sarcoidosis
  • Any allergies, including allergies to foods, dyes, or preservatives.
Also, let your healthcare provider know if you are:
Make sure to tell your healthcare provider about all other medicines you are taking, including prescription and non-prescription medicines, minerals, vitamins, and herbal supplements.
(Click Safety of Calcium for more information, including any available warnings and precautions.)

How Does It Work?

Most of the calcium in the human body is stored in the bones and the teeth. While many people think of bones and teeth as being permanent, unchanging structures, they are actually always being broken down and rebuilt. It is essential to keep a certain steady level of calcium in the blood. If blood calcium citrate levels are too low, the body will break down bone and teeth to increase these levels. If the blood levels are high, the body uses the extra calcium citrate to rebuild bone and teeth.
Written by/reviewed by:
Last reviewed by: Kristi Monson, PharmD;
Last updated/reviewed:
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