An agent of the present invention comprising poultry feet or a processed product thereof, preferably a hydrolysate of an extract of poultry feet, promotes hyaluronic acid production, thereby exhibiting excellent effects of preventing or treating a joint disorder, improving skin dryness, wrinkles or skin tension, moisturizing the skin, etc. The agent is thus useful as a medicament, a quasi-drug, a cosmetic product, a food product or an animal feed.
