Molar conductivity of saturated aqueous solutions of calcium d-saccharate, used as a stabilizer of beverages fortified with calcium d-gluconate, increases strongly upon dilution, indicating complex formation between calcium and d-saccharate ions, for which, at 25 °C, K_assoc = 1032 ± 80, ΔH_assoc° = -34 ± 6 kJ mol^-1, and ΔS_assoc° = -55 ± 9 J mol^-1 K^-1, were determined electrochemically. Calcium d-saccharate is sparingly soluble, with a solubility product, K_sp, of (6.17 ± 0.32) × 10^-7 at 25 °C, only moderately increasing with the temperature: ΔH_sol° = 48 ± 2 kJ mol^-1, and ΔS_assoc° = 42 ± 7 J mol^-1 K^-1. Equilibria in supersaturated solutions of calcium d-saccharate seem only to adjust slowly, as seen from calcium activity measurements in calcium d-saccharate solutions made supersaturated by cooling. Solutions formed by isothermal dissolution of calcium d-gluconate in aqueous potassium d-saccharate becomes spontaneously supersaturated with both d-gluconate and d-saccharate calcium salts, from which only calcium d-saccharate slowly precipitates. Calcium d-saccharate is suggested to act as a stabilizer of supersaturated solutions of other calcium hydroxycarboxylates with endothermic complex formation through a heat-induced shift in calcium complex distribution with slow equilibration upon cooling.