Calcium supplement


Calcium supplements are salts of calcium used in a number of conditions. Supplementation is generally only required when there is not enough calcium in the diet. By mouth they are used to treat and prevent low blood calcium, osteoporosis, and rickets. By injection into a vein they are used for low blood calcium that is resulting in muscle spasms and for high blood potassium or magnesium toxicity.
Common side effects include constipation and nausea. When taken by mouth high blood calcium is uncommon. Calcium supplements, unlike calcium from dietary sources, appear to increase the risk of kidney stones. Adults generally require about a gram of calcium a day. Calcium is particularly important for bones, muscles, and nerves.
The medical use of calcium supplements began in the 19th century. It is on the World Health Organization's List of Essential Medicines, the safest and most effective medicines needed in a health system. They are available as generic medication. The wholesale cost in the developing world is about US$0.92–4.76 per month. In the United States treatment generally costs less than $25 per month. In 2017, it was the 262nd most commonly prescribed medication in the United States, with more than one million prescriptions. Versions are also sold together with vitamin D. The combination, calcium/cholecalciferol was the 236th most commonly prescribed medication in the United States, with more than two million prescriptions.

Medical use

Bone health

In healthy people, calcium supplementation is not necessary for maintaining bone mineral density, and carries risks that outweigh any benefits. Calcium intake is not significantly associated with hip fracture risk in either men or women. The U.S. Preventive Service Task Force recommends against a daily supplement of calcium or vitamin D. Although a slight increase in bone mineral density occurred in healthy children from calcium supplementation, using additional dietary calcium is not justified, according to a 2006 review.

Cardiovascular impact

In young adults with normal blood pressure, additional calcium intake caused a small reduction of systolic and diastolic blood pressure. By contrast, a study investigating the effects of personal calcium supplementation on cardiovascular risk in the Women's Health Initiative Calcium/Vitamin D Supplementation Study found a modestly increased risk of cardiovascular events, particularly myocardial infarction in postmenopausal women. A broad recommendation of calcium/vitamin D supplements is therefore not warranted. A 2013 literature review concluded that the benefits of calcium supplementation in some studies, such as on bone health, appear to outweigh any risk calcium supplementation may pose to the cardiovascular health.

Cancer

Overall, there is no clear evidence of the effect of calcium supplements in cancer prevention: some studies suggest it might decrease the risk, but others suggest it might increase the risk. Consequently, the National Cancer Institute does not recommend the use of calcium supplements for this purpose.
There is weak evidence calcium supplementation might have a preventative effect against developing colorectal adenomatous polyps, but the evidence is not sufficient to recommend such supplementation.

Side effects

Excessive consumption of calcium carbonate antacids/dietary supplements over a period of weeks or months can cause milk-alkali syndrome, with symptoms ranging from hypercalcemia to potentially fatal kidney failure. What constitutes "excessive" consumption is not well known and, it is presumed, varies a great deal from person to person. Persons consuming more than 10 grams/day of CaCO3 are at risk of developing milk-alkali syndrome, but the condition has been reported in at least one person consuming only 2.5 grams/day of CaCO3, an amount usually considered moderate and safe.
Although some studies have suggested that excessive intake of calcium in the diet or as supplements could be associated with increased cardiovascular mortality, other studies found no risk, leading a review to conclude that any risk could only be ascertained with specific further research.
Calcium supplements may contribute to the development of kidney stones.
Acute calcium poisoning is rare, and difficult to achieve without administering calcium intravenously. For example, the oral median lethal dose for rats for calcium carbonate and calcium chloride are 6.45 and 1.4 g/kg, respectively.

Interactions

Calcium supplements by mouth diminish the absorption of thyroxine when taken within four to six hours of each other. Thus, people taking both calcium and thyroxine run the risk of inadequate thyroid hormone replacement and thence hypothyroidism if they take them simultaneously or near-simultaneously.

Types

The intravenous formulations of calcium include calcium chloride and calcium gluconate. The forms that are taken by mouth include calcium acetate, calcium carbonate, calcium citrate, calcium gluconate, calcium lactate and calcium phosphate.
Vitamin D is added to some calcium supplements. Proper vitamin D status is important because vitamin D is converted to a hormone in the body, which then induces the synthesis of intestinal proteins responsible for calcium absorption.

Labeling

For U.S. dietary supplement and food labeling purposes the amount in a serving is expressed in milligrams and as a percent of Daily Value. The weight is for the calcium part of the compound - for example, calcium citrate - in the supplement. For calcium labeling purposes 100% of the Daily Value was 1000 mg, but as of May 2016 it has been revised to 1300 mg. A table of the pre-change adult Daily Values and references for the revision are provided at Reference Daily Intake. Food and supplement companies have until July 2018 to comply with the labeling change.