Side-by-Side Comparison
Essential Vitamins & Minerals
Calcium (Elemental Ca) vs. Magnesium (Elemental Mg)
Comparing 2 standards across 9 specifications. 8 key differences identified.
Comparing:
Calcium (Elemental Ca)
Magnesium (Elemental Mg)
Calcium is the most abundant mineral in the human body (1.0–1.2 kg), with 99% sequestered in hydroxyapatite bone lattice and 1% tightly regulated at 8.5–10.5 mg/dL serum for cardiac contractility, nerve signaling, and blood coagulation. Adult RDA is 1,000–1,200 mg/day.
Magnesium is an essential macromineral required as an enzymatic cofactor in over 300 biochemical reactions including ATP synthesis, DNA replication, and neuromuscular transmission. Adult RDA is 400–420mg (men) / 310–320mg (women).
Specification Comparison Table
9 Parameters| Parameter / Spec | ||
|---|---|---|
|
Nutrient Type
|
Essential Macromineral | Essential Macromineral |
|
Adult RDA / RDI
|
1,000 mg / day (Men 19–70, Women 19–50) / 1,200 mg (Women 51+, Men 71+) | 400 – 420 mg / day (Men) / 310 – 320 mg / day (Women) |
|
Tolerable Upper Limit (UL)
|
2,500 mg / day (Adults 19–50) / 2,000 mg / day (Adults 51+) (Avoid nephrolithiasis / vascular calcification) | 350 mg / day (From supplemental forms only; no limit on whole foods) |
|
Chemical Forms
|
Calcium Carbonate (40% elemental Ca / requires stomach acid), Calcium Citrate (21% elemental Ca / acid-independent), Hydroxyapatite | Magnesium Glycinate (Chelate), Citrate, Malate, Oxide, L-Threonate |
|
Primary Biological Function
|
Hydroxyapatite bone/dental structure [Ca10(PO4)6(OH)2], Troponin-C actin-myosin muscle contraction, Factor IV blood clotting cascade, Exocytosis neurotransmitter release | Mg-ATP complex cofactor (>300 enzymes), NMDA receptor gatekeeper, Protein synthesis, Muscle relaxation |
|
Deficiency Condition
|
Osteoporosis, Osteopenia, Rickets (children), Tetany (Trousseau's and Chvostek's signs of hypocalcemia) | Muscle cramps, Tremors, Ventricular arrhythmias, Insulin resistance, Insomnia |
|
Top Whole Food Sources
|
Parmigiano-Reggiano, Sharp Cheddar, Whole Milk, Sardines with bones, Kale, Tofu (Calcium-set), Fortified Plant Milk | Pumpkin Seeds, Hemp Hearts, Chia Seeds, Almonds, Spinach, Black Beans, Dark Chocolate |
|
Parathyroid Hormone (PTH) Homeostasis
|
Serum Ca2+ drop triggers PTH secretion, stimulating renal 1-alpha-hydroxylase to produce active Calcitriol (1,25-OH-D3) and osteoclast bone resorption | — |
|
Cellular Distribution
|
— | 99% intracellular (60% bone, 39% skeletal muscle, <1% serum) |
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