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concern
Hydration
Skin's ability to hold water — essential for barrier function, plumpness, and a healthy glow.
Evidence: strong
Hydration refers to the water content of the stratum corneum. Well-hydrated skin is plump, flexible, and resilient. Dehydrated skin appears dull, feels tight, and shows fine lines. The DermaGenome Knowledge Graph connects hydration to the skin barrier, ceramides, hyaluronic acid, LED therapy, and the Beauty Score.
Overview
Skin hydration depends on the integrity of the barrier (ceramides, cholesterol, fatty acids), humectants that bind water (hyaluronic acid, glycerin), and the occlusive seal that prevents evaporation.
Causes of Dehydration
Cold/dry climate, over-exfoliation, harsh cleansers, aging, low humidity, caffeine, and inadequate water intake.
Connected Concepts
Ingredients
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