powder l hpc by shin etsu chemical co ltd a substitution degree of 0 2 was dissolved in 90 g of an aqueous 10 by weight naoh solution a male pin and a female pin for capsule formation with an internal diameter of 5 mm were immersed in the naoh solution and then immersed in an aqueous 10 by weight hydrochloric acid solution resulting in a state in which a gel film of low substituted hyroxypropylcellulose containing the salt covers the pins after the pins with the gel film were immersed in water and washed the pins were then dried at 30 u00b0 c to obtain a hard capsule containing vitamin c gelatin capsules were also prepared by a conventional method the capsules were subjected to a disintegration test according to japanese pharmacopoeia on six capsules each the soft capsules comprising l hpc disintegrated within 1 minute while the gelatin capsules disintegrated in the range of 3 to 5 minutes also observing the yellowing change of the vitamin c in the capsules stored at 40 u00b0 c for one month there was clearly less yellowing in the capsules of the present invention than in the gelatin capsules the 10 g of low substituted hydroxypropylcellulose powder l hpc by shin etsu chemical co ltd a substitution degree of 0 2 was dissolved in 90 g of an aqueous 10 by.