It is intended to provide a chlorella extract-containing material which is excellentin safety and storage stability without resorting to use a benzoic acid salt havingbeen commonly employed as a preservative. A chlorella extract-containing materialwhich contains from 0.020 to 1.63% by weight on a dry basis of a capsicum extractto the chlorella extract in an aqueous liquid drink comprising the chlorellaextract as the main component. This chlorella extract-containing materialis used in a chlorella-containing drink or a chlorella-containing food additive.A method of improving the storage stability of a chlorella extract-containingmaterial which comprises adding from 0.020 to 1.63% by weight on a dry basis ofa capsicum extract to the chlorella extract in an aqueous liquid drink comprisingthe chlorella extract as the main component.
