Skin, hair & nails

# Skin, Hair & Nails Domain Description

The skin, hair, and nails domain encompasses the health and appearance of the integumentary system—the body's largest organ. These tissues are interconnected physiologically and often reflect overall nutritional status and internal health. Skin serves as a barrier against environmental damage, hair provides protection and thermoregulation, and nails offer insight into systemic health. This domain matters because these tissues are constantly renewing themselves, requiring adequate nutrient supply and metabolic support. Concerns in this area range from cosmetic goals like improved skin elasticity and hair thickness to clinical issues such as dermatitis, alopecia, and brittle nails. Many people seek interventions in this domain because visible improvements can occur relatively quickly compared to other health outcomes, and because skin, hair, and nail health directly affects quality of life and self-perception.