Q.p. Corporation

Wakako Sakamoto

Kazuya Yoshida

Shunichi Fujikawa

Kazunori Asaoka

Tomoyuki Kanemitsu

Osami Kajimoto

Wataru Odanaka

A cationized hyaluronic acid and/or a salt thereof includes a quaternary ammonium group-containing group, and has a degree of cationization of 0.15 to 0.6.

Cationized hyaluronic acid and/or salt thereof, method of producing the same, hair modifying agent, cuticle repairing agent, skin modifying agent, and cosmetic preparation each using the same

There are provided an oral skin improving agent that exhibits good skin improving effects when orally ingested, suppresses problems of discoloration and generation of unpleasant odor during storage, and has excellent storage stability; a food composition for improving skin containing this skin improving agent; and a skin improving method. The oral skin improving agent contains as a principal component refined hyaluronic acid having a purity of at least 90%, preferably at least 95%, and an average molecular weight in a range of 750,000 to 1,200,000, preferably 800,000 to 1,000,000. A person's skin can be improved by having the person ingest the oral skin improving agent such that the ingestion amount thereof is at least 5 mg per day.

Oral skin improving agent, skin improving method, and food composition for improving skin

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Tokyo, Japan

Wakako Sakamoto