Rodan + Fields Active Hydration Serum is a physician-developed, clinically proven facial hydration serum that uses proprietary 3D3P Molecular Matrix Technology to deliver and continuously release moisture into the skin — going significantly beyond conventional hyaluronic acid serums that hydrate only the skin surface. It is the foundational hydration step in the Rodan + Fields system, providing the sustained moisture environment that makes all other treatment products more effective.3D3P Molecular Matrix Technology creates an intelligent, self-activating three-dimensional polymer network that acts as a moisture reservoir within the skin — continuously releasing water over time rather than depositing it all at once and evaporating. This mechanism produces visibly plumped, smoother skin immediately while building long-term hydration reserves with consistent use. Multi-weight Hyaluronic Acid (including Micro-HA) penetrates multiple skin depths for comprehensive hydration from surface to dermis. The lightweight, fast-absorbing serum layers cleanly under moisturizer, treatment products, and SPF.Apply to cleansed skin morning and evening before moisturizer. All skin types. Available at Beauty Riche — authorized Rodan + Fields retailer with same-day shipping.