Before taking NKG Kefir, UV irradiation was performed on the inner side of the upper arm of a person with minimal erythema, and 2 weeks later and 4 weeks later, pigmentation was measured with a Mezzameter. Similarly, at the start of intake, UV irradiation was performed on the inside of the other upper arm, and pigmentation was measured after 2 weeks and 4 weeks. By taking NKG Kefir, melanin level and erythroma level decrease.