Persistent dryness that doesn't respond to moisturiser is usually a barrier problem, not a hydration problem. When the skin's lipid matrix is depleted — by over-cleansing, hard water, exfoliation, or climate — water leaves faster than you can replace it. Terra works at that structural level: Ceramide NP replenishes the lipid matrix. Sodium Polyglutamate Crosspolymer holds moisture for longer than hyaluronic acid (based on published manufacturer data). Natural moisturising factors — Proline, Arginine, Serine — reinforce the skin's own water-binding system.Cedar of the Forest cleanses without the anionic surfactants that strip the barrier lipids Terra is trying to restore. Dermatologically tested. Made for skin that's been through enough.