Abstract: The antihypertensive agent of the present invention contains a soluble silicon compound. The soluble silicon compound is preferably metasilicic acid or a salt thereof. In one embodiment, the antihypertensive agent of the present invention contains deep sea water containing the soluble silicon compound, or a dried product of such deep sea water. It is preferred that in such embodiment, the antihypertensive agent further contains metasilicic acid or a salt thereof. The amount of silicon present in the deep sea water in the form of silicic acid (SiO2—Si) is 25 ?M or more. The deep sea water is typically collected at a depth of 300 m or deeper, and preferably at a depth of 600 m or deeper.

Abstract: The antihypertensive agent of the present invention contains a soluble silicon compound. The soluble silicon compound is preferably metasilicic acid or a salt thereof. In one embodiment, the antihypertensive agent of the present invention contains deep sea water containing the soluble silicon compound, or a dried product of such deep sea water. It is preferred that in such embodiment, the antihypertensive agent further contains metasilicic acid or a salt thereof. The amount of silicon present in the deep sea water in the form of silicic acid (SiO2—Si) is 25 ?M or more. The deep sea water is typically collected at a depth of 300 m or deeper, and preferably at a depth of 600 m or deeper.

Abstract: Weathered reef-building coral is immersed in an aqueous alkali solution under reduced pressure to carry out alkali washing to make the aqueous alkali solution penetrate into the weathered reef-building coral throughout its fine structure inside the porous tissue, which is subsequently washed with water until a washing from the inside of the porous tissue is neutralized.As a result of this washing, various marine algae, various microorganisms including Vibrio bacteria inhabiting the ocean and other various organic substances held in the inner fine structure of weathered reef-building coral can be removed. Thus, a weathered reef-building coral material can be obtained whose safety has been ensured. This weathered reef-building coral material is suitable for food materials, filter mediums for water purifiers and so forth.