Also known as: Ca, Calcium carbonate
Calcium is the most abundant mineral in the human body, essential for building and maintaining strong bones and teeth. It also plays critical roles in muscle contraction, nerve signaling, and blood clotting.
Calcium is a vital mineral that constitutes approximately 1–2% of adult body weight, with 99% stored in bones and teeth as hydroxyapatite crystals. Beyond its structural role, calcium functions as an intracellular messenger regulating muscle contraction, neurotransmitter release, and hormonal secretion. Adequate calcium intake throughout life is essential for achieving peak bone mass and preventing osteoporosis. The body tightly regulates serum calcium levels through parathyroid hormone, calcitonin, and vitamin D. When dietary intake is insufficient, calcium is mobilized from bone stores, leading to gradual bone density loss. Adults typically require 1.000–1.200 mg daily, and supplementation is particularly important for postmenopausal women and older adults at elevated fracture risk.
Adequate calcium intake combined with vitamin D reduces the risk of osteoporotic fractures by 15–30%, particularly in postmenopausal women and elderly populations.
Meta-analyses suggest that calcium supplementation modestly reduces systolic blood pressure by 1–2 mmHg, with greater effects in individuals with low baseline calcium intake.
Calcium ions trigger muscle contraction through troponin binding and regulate neurotransmitter release at synaptic junctions, making adequate levels critical for normal physiological function.
Split into 2 doses with meals
Absorption is optimal in doses of 500 mg or less. Include dietary calcium in total count.
Split into 2–3 doses with meals
Always combine with vitamin D (800–1.000 IU) for optimal absorption and bone protection.
People with low stomach acid or those taking PPIs
Cost-effective option with highest elemental calcium content
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