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Reference 3 : Vitamin D Classic and Novel Actions

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Reference 4 : A Randomized Open-Label Clinical Study Comparing the Efficacy, Safety, and Bioavailability of Calcium Lysinate with Calcium Carbonate and Calcium Citrate

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Reference 6 : The role of nutrients in bone health, from A to Z

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Reference 7 : Bioavailability of calcium in an enriched postbiotic system compared to calcium citrate in healthy postmenopausal females

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