Calcium is the fifth most abundant element and the third most abundant metal found in the earth’s crust. The
name calcium comes from the Latin word calx, meaning lime, and it is a direct reference to
one of the more common calcium sources: limestone. It is an essential mineral that is vital to life and is
the building block for bones (including teeth). Calcium also plays a pivotal role in cell signaling and
What is Coral Calcium (Aragonite)?
Coral calcium is a calcium salt derived from fossilized coral reefs. Like other calcium sources such as
oyster shells or limestone rock, it’s primarily calcium carbonate (CaCO3) with trace amounts of magnesium
and many other minerals. Calcium carbonate is one of the most prevalent calcium compounds, and it has
anti-inflammatory and antioxidant properties. Calcium carbonate has three crystal forms: calcite, vaterite,
and aragonite. Almost all members of the Mollusca phylum contain aragonite, and it forms the exoskeleton of
corals. Aragonite is critical for replicating reef conditions and sustaining most sea life. It helps aquaria
sustain its natural pH, and it is an effective means of removing contaminants from polluted water.
PureBulk’s coral calcium originates from Okinawa, Japan. The Japanese government carefully controls the sale
of coral calcium to protect living coral reefs.
Potential Calcium Benefits
Calcium for Bones
Calcium plays a pivotal role in forming and maintaining strong bones, as evidenced by the robust bone health
in individuals that consume calcium-rich diets. Coral calcium rose in popularity in part because of
Okinawans’ long lifespans. A proposed explanation is the mineral content in their water due to the
prevalence of coral reefs. Coral calcium has a similar composition to human bones, and surgeons have used it
as a bone graft material for more than three decades.
It also contains hydroxyapatite, a calcium product that comprises up to 70% of human bones by weight and 80%
of dentin and enamel mass in teeth. It also helps counteract dental hypersensitivity associated with teeth
whitening products and protects against cavity formation. Dental surgeons use hydroxyapatite for hard tissue
repairs, as it bears a strong chemical similarity to natural hard tissues like enamel and dentin. A human
study noted that coral calcium is easier to absorb than standard calcium supplements. An animal study also
reported that coral calcium improved bone mineral density better than regular calcium supplements.
Calcium and Vitamin D
Vitamin D is critical for optimal
calcium absorption. The human body needs adequate vitamin D to form calcitriol (active vitamin D).
Without sufficient calcitriol, the body can’ absorb calcium from dietary sources.
Calcium Carbonate Antacid Properties
Calcium carbonate is an effective stomach acid neutralizer. As such, many individuals take it to relieve
upset stomach, acid indigestion, and heartburn. Excess stomach acid erodes the mucus membrane that lines the
stomach, causing stomach pain. It also increases the likelihood of acid reflux, which can cause heartburn
and wear away at the teeth.
Calcium and Heart Health
Calcium supplements may support heart health in a few ways. Milk products fortified with calcium reduce lipid
absorption by improving how well the body excretes fats. One study noted an increased excretion rate of
total fat by 139% and fatty acids by 195%. An animal study also reported that coral calcium exerted
anti-inflammatory and antihypertensive effects on vascular cells.
Calcium Deficiency Symptoms
Vitamin D deficiencies are the most common cause of hypocalcemia (low calcium). However, postmenopausal
women, individuals with milk allergies, individuals with lactose intolerance, and vegans have an increased
risk of developing a calcium deficiency. Symptoms include weak or brittle bones, increased falling, tingling
in the hands and feet, numbness around the mouth, and muscle spasms.
Potential Calcium Side Effects
Calcium supplements don’t typically cause side effects. Individuals may experience minor gastrointestinal
side effects while taking calcium supplements, such as bloating, constipation, or gas. However, taking large
doses on a consistent basis can lead to hypercalcemia (high calcium blood levels) and other health problems.
Consult with a physician before taking any new supplements.
Tested by Accredited 3rd Party Labs
PureBulk's supplements are tested by accredited third party labs in the USA to ensure their identity, purity
and potency. To receive a copy of these test results or any other PureBulk supplement please fill out the COA request form found here.