Abstract: Active amino acid Ca, i.e., calcium oxide and/or hydroxide product coexistent with a slight amount of one or more amino acids and/or hydrolyzable amino acid derivatives is disclosed, which can be effectively absorbed into the human body and can deposit onto the bone with a high efficiency. Beverages containing same are also disclosed. The active amino acid Ca product is produced by calcining a calcium-containing material at 800.degree.-980.degree. C. in a calcining chamber free from oxygen, and subjecting the calcined product to a forced cooling step.