Supplements used for aesthetics may affect at least one aspect of skin, hair, or nails. Such aspects tend to include:
Skin: moisture/hydration, strength, elasticity, evenness of pigmentation, redness/inflammation, acne, and other abnormalities.
Hair: thickness, strength, shedding rate, growth rate, and moisture.
Nails: growth rate, brittleness, discoloration.
Supplements may act as structural components, such as collagen; affect the synthesis of structural components, such as vitamin A; or impact the amount of damage done to structures, such as olive leaf extract.