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The plasma total calcium concentration is in the range of 2.2–2.6 mmol/L (9–10.5 mg/dL), and the normal ionized calcium is 1.3–1.5 mmol/L (4.5–5.6 mg/dL). [4] The amount of total calcium in the blood varies with the level of plasma albumin, the most abundant protein in plasma, and therefore the main carrier of protein-bound calcium in the blood.
This can increase calcium absorption, leading to abnormally high levels of calcium in the blood, Zumpano notes. Symptoms of vitamin D toxicity include: Nausea. Vomiting. Constipation.
The absorption of calcium from most food and commonly used dietary supplements is very similar. [27] This is contrary to what many calcium supplement manufacturers claim in their promotional materials. The studies of absorption of two most common salts, calcium carbonate and calcium citrate, show varied results.
Vitamin D increases absorption of calcium and phosphate in the intestinal tract, leading to elevated levels of plasma calcium, [4] and thus lower bone resorption. Calcitriol (1,25-dihydroxycholecalciferol) is the active form of vitamin D 3. [10] It has numerous functions involved in blood calcium levels.
While full-fat dairy products do contain more saturated fat, that fat is also packaged with other nutrients like calcium, which can be beneficial for blood pressure.
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