A potent 4D hyaluronic acid combination of multidimensional molecular weights helps to regenerate, hydrate, and plump skin from the surface through the epidermis and dermis. Natural Arctic Tree extract optimizes performance to soothe damaged skin as well as promote the anti-inflammatory response in sensitive skin.Use twice daily after thorough cleansing and toning. If using alpha or beta-hydroxy acids or retinol, use 4D+ Hyaluronic Serum first and let it absorb before applying other products. May be used under your day or night moisturizer. Use post-treatment to calm & reduce recovery time.High molecular weight Hyaluronic Acid hydrates the skin and helps with barrier repair function as well as firming, lifting, and soothing. Mid molecular weight Hyaluronic Acid penetrates the stratum corneum protecting the skin’s NMF, a natural moisturization factor.This helps reduce inflammation and irritation as well as restoring moisture in dry, sensitive skin. Low molecular weight Hyaluronic Acid penetrates even deeper into the epidermis and upper layer of the dermis and induces the production of natural Hyaluronic Acid in the skin to promote healthy, radiant skin.Sodium Hyaluronate attracts water and moisture into the skin and reduces dryness and flaking. Its lubricating and film-forming properties nourish the skin for long-lasting moisturization.