Calcium Bioavailability of an Organic Calcium–CPP Granule Formulation: In Vitro Performance and Evidence from Human Studies
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The tablet formulation contains calcium citrate malate, calcium L-lactate, casein phosphopeptide (CPP), inulin, resistant dextrin, and microencapsulated vitamin D3. The ingredients are incorporated through a prefabricated-granule process. In comparative tests, the formulation showed greater calcium release and soluble-calcium retention in simulated gastrointestinal media than direct mixing. Objective to examine whether these formulation findings are consistent with human evidence on calcium absorption and bioavailability. The reported formulation composition and comparative test results were used without changing their original values. Human studies were identified through a focused search of PubMed-indexed randomized and crossover trials and relevant primary reports available through 14 August 2026. The search covered calcium citrate malate, CPP, inulin-type fructans, and vitamin D in relation to calcium absorption. The preferred formulation released 84.7% of its calcium within 30 minutes in simulated gastric fluid and retained 61.5% in soluble form after 60 minutes in simulated intestinal fluid. Direct mixing resulted in lower values of 70.4% and 46.7%, respectively. In human studies, CCM was absorbed, although absorption varied with the food matrix. Inulin-type fructans increased calcium absorption in some adolescent and postmenopausal populations. The available CPP trials did not show a clear improvement in fractional calcium absorption, while the effects of vitamin D supplementation differed across study populations. The formulation has a credible physicochemical rationale for delivering soluble calcium, with the strongest ingredient-level clinical support attributable to selected prebiotic strategies and established absorbability of organic calcium salts. The evidence supports further direct stable-isotope evaluation of the finished formulation.
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