[Problem] The purpose of the present invention is to provide: a polyphosphoric acid composition which has a high cell proliferation enhancing ability, high cell permeability and a high ability of prolonging the lifetime of a cell and can act to enhance the growth of hair and to maintain the growth phase of hair a polyphosphoric acid composition which is highly safe and contains a naturally synthesized polyphosphoric acid and a method for producing a polyphosphoric acid composition containing a naturally synthesized polyphosphoric acid. [Solution] According to the present invention, a polyphosphoric acid composition containing a polyphosphoric acid extracted from an yeast cell, a salt of the polyphosphoric acid or a solvate of the polyphosphoric acid can be produced. The polyphosphoric acid composition containing a polyphosphoric acid extracted from an yeast cell, a salt of the polyphosphoric acid or a solvate of the polyphosphoric acid has high cell permeability. When the polyphosphoric acid composition is applied to skin, gum or scalp, the polyphosphoric acid composition can act effectively for the proliferation of a cell, the prolongation of the lifetime of a cell, the growth of hair, and the maintenance of the growth phase of hair.
