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Why Do We Need Calcium?

We take a look at the importance of calcium as we explore why our bodies require this essential mineral for optimal health.

What is calcium?

Calcium is an abundant mineral in the body making up 1.5 to 2% of the total body weight, it plays a role in many of the body’s systems and functions [i]. Calcium is a mineral, needs in the body to build and maintain bone strength and to carry out many important functions.

What is calcium found in?

Food sources of calcium

Dairy, fish and seafood, particularly small-boned fish such as sardines

(which also contain vitamin D), dark green leafy vegetables (turnip, collard, and mustard greens) and dried fruit such as figs or prunes.

What are the health benefits of calcium?

Perhaps its most famous role is contributing to strong bones and teeth where most of the calcium in the body can be found. It helps to build and preserve bone mass which is especially important for post-menopausal women who are prone to developing osteoporosis, due to lowered oestrogen levels.

Additionally, the body needs calcium for muscles to move and for nerves to carry messages around the brain and to the rest of the nervous system. Calcium also helps blood vessels contract in order to move blood throughout your body and helps release hormones that affect many the body’s functions. Calcium transport and uptake is governed by parathyroid hormone, to ensure levels are kept optimal for health.

Calcium is commonly medically prescribed as a dietary supplement. Various types include carbonate, phosphate, citrate, and citrate malate. The types used by reputable supplement brands are better absorbed and easier on digestion such as calcium citrate [ii].

Calcium and vitamin D absorption

Vitamin D helps your body effectively absorb calcium. Therefore, if calcium supplementation is sufficient, it could go to waste in cases of vitamin D deficiency [iii]. The body naturally produces vitamin D when skin is exposed to the sun. During winter months and in those with darker skin, the skin will not produce vitamin D at high enough levels, so supplements may be necessary to avoid deficiency.

Strong bones and teeth

Bone is an active tissue that is turning over constantly. This process is regulated by cellular activities that resorb and form bone. Over 99% of calcium resides in the skeleton as hydroxyapatite, a complex formed from calcium phosphate.

In the rapidly growing child, calcium deficiency causes rickets. People also need more calcium when intestinal absorption of calcium is impaired through poor gut health, or when there are losses of calcium due to excess excretion via the urine or lactation [iv]


Osteoporosis is a disease characterised by a decrease in bone mass that results in an increased susceptibility to fracture, especially of the wrist, spine, and hip. It is common in postmenopausal women and in the elderly of both sexes.

In a study, 400 mg of calcium twice daily averted bone loss. The study was performed on 63 postmenopausal women, 57 of whom were early postmenopausal (five years after menopause) and six of whom were mid-postmenopausal (five to ten years after menopause) [vi].

Cardiovascular disease prevention

In recent research, the potential effects of both inadequate and excessive calcium intake have received growing attention. Changes in blood calcium concentrations may reflect a disturbed calcium phosphate balance, which is associated with increased risk of cardiovascular disease. Both test tube and animal studies suggest that calcium may be involved in cardiovascular disease development due to causes such as high cholesterol, over-expansion of the blood vessels, increased inflammation, blood clotting (thrombosis), obesity and calcification of blood vessels [vii].

Pre-Menstrual Syndrome (PMS)

PMS is a prevalent health problem among young women, it describes a collection of symptoms occurring around 1 to 2 weeks prior to menstruation. Vitamin D, calcium and magnesium nutritional status were found to be compromised in PMS subjects. Nutritional intake of calcium was said to be lower in PMS sufferers [viii].

Signs and symptoms of calcium deficiency

Aching joints, frequent fractures, brittle nails, eczema [x], muscle cramps, elevated cholesterol [ix].

Symptoms of excessive calcium

Constipation, gas, and bloating. Excessive levels of calcium in the blood may also increase your risk of kidney stones. In rare cases, too much calcium can cause deposits of calcium in your blood; this is called hypercalcaemia.


Hypercalcaemia and medical interactions

Excessive high doses in calcium supplementation can increase the risk of kidney stones and potentially have negative effects on cardiovascular health. They may also cause gastrointestinal issues like constipation.

Prolonged high calcium intake can lead to hypercalcaemia, a condition defined by elevated levels of calcium in the blood. It is important to consult with a professional to determine the appropriate dosage for you and to determine the risks of any possible interactions with medication (such as antibiotics).

Recommended For

Osteoporosis , Arthritis (Osteo) , Skin Support , Stress , Premenstrual Tension/ Syndrome

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