Patent ID: 8911805

Claim:
An aqueous preparation of calcium comprising water, calcium, a compound of a Formula I, and a compound of a Formula II as constituent elements, wherein 98% or more of the calcium is in a non-ionic calcium form and forms a complex, wherein in the complex, the calcium binds to the compound of the Formula I and/or the compound of the Formula II in a state that basic structures of these compounds are kept, and at least a part of the complex forms colloidal particles having an average particle diameter of 100 nm or less, and wherein the aqueous preparation of calcium is a transparent aqueous preparation having a pH value ranging from 4 to 13; wherein, A1, A2, A3, A4, A5 and A6 are independently O— or OX, X represents a monovalent or polyvalent cation, and the Xs are the same or different when multiple OXs exist.