Calcium Citrate + Magnesium + Zinc + Vitamin D3

Mechanism

Calcium Citrate is used to prevent or treat low blood calcium levels in people who do not get enough calcium from their diets. It may be used to treat conditions caused by low calcium levels such as bone loss (osteoporosis), weak bones (osteomalacia/rickets), decreased activity of the parathyroid gland (hypoparathyroidism), and a certain muscle disease (latent tetany). It may also be used in certain patients to make sure they are getting enough calcium (e.g., women who are pregnant, nursing, or postmenopausal, people taking certain medications such as phenytoin, phenobarbital, or prednisone).
Calcium plays a very important role in the body. It is necessary for normal functioning of nerves, cells, muscles, and bones. If there is not enough calcium in the blood, then the body will take calcium from bones, thereby weakening bones. Having the right amount of calcium is important for building and keeping strong bones.
Magnesium assures the strength and firmness of bones and makes teeth harder. It is essential for absorption and metabolism of calcium. Magnesium also has a role to play, together with the thyroid and parathyroid glands, in supporting bone health: stimulating the thyroid's production of vitamin D₃, which acts as a bone-preserving hormone, and regulating parathyroid hormone, a function of which is to regulate bone breakdown in a number of ways. The enzyme that is required for forming new calcium crystals, alkaline phosphatase, also requires magnesium for activation, and if levels are low, abnormal bone crystal formation can result. Even mild magnesium deficiency is reported to be a leading risk factor for osteoporosis.
Zinc is a trace element that is chemically similar to magnesium. It is essential for many bodily functions including the immune response, reproduction, growth and development, and neurological roles. Zinc acts as a cofactor for enzymes that are involved in protein and nucleic acid synthesis, and is known to play an important role in the bone remodeling cycle. Where it is involved as a cofactor for proteins involved in deposition and resorption of the bone matrix; plays a regulatory role; and is involved in the structure of the bone itself.
There are two major roles for zinc concerning bone health:
1. Bone mineral hydroxyapatite crystals contain a complex of zinc and fluoride.
2. Zinc stimulates bone building osteoblasts, and inhibits the function of bone resorption by osteoclasts.
Vitamin D₃ is used to treat and prevent low levels of calcium in the blood of patients whose kidneys or parathyroid glands (glands in the neck that release natural substances to control the amount of calcium in the blood) are not working normally. Low blood levels of calcium may cause bone disease. It works by helping the body to use more of the calcium found in foods or supplements.
Vitamin D₃ is also sometimes used to treat rickets (softening and weakening of bones in children caused by lack of vitamin D), osteomalacia (softening and weakening of bones in adults caused by lack of vitamin D), and familial hypophosphatemia (rickets or osteomalacia caused by decreased ability to break down vitamin D in the body).It is also sometimes used to increase the amount of calcium in the blood of premature (born early) babies.

Pharmacokinetics

• Calcium Absorption: Citrate form ensures high bioavailability and better absorption compared to carbonate.
• Magnesium Absorption: Absorbed in the small intestine; bioavailability ~30–40%.
• Zinc Absorption: Absorbed in the small intestine; affected by dietary phytates.
• Vitamin D3 Absorption: Fat‑soluble; absorbed in intestine and metabolized to calcitriol.
• Distribution: Calcium and magnesium distributed to bones and teeth; Zinc widely distributed; Vitamin D3 stored in fat and muscle.
• Excretion: Calcium and magnesium via urine/feces; Zinc via feces; Vitamin D metabolites via bile.
• Half-life: Calcium ~hours; Magnesium ~27 hours; Zinc ~hours; Vitamin D3 ~15 days.

Side Effects

• Constipation
• Nausea
• Flatulence
• Hypercalcemia (rare)

Contraindication

• Hypercalcemia
• Renal calculi
• Vitamin D toxicity
• Hypersensitivity to any component

Interaction

• Thiazide diuretics (increase calcium levels)
• Digitalis (risk of arrhythmias with hypercalcemia)
• Iron supplements (may reduce zinc absorption)

Warning and Precautions

• Use under medical supervision only
• Monitor calcium and Vitamin D levels during therapy
• Ensure adequate hydration