Category BARRIER & HYDRATION

Explain the skin barrier’s structure and function, how hydration is maintained, and the chemistry of barrier-supporting ingredients (ceramides, lipids, humectants, occlusives) used in skincare.

Hyaluronic Acid

Combine Vitamin C and Hyaluronic Acid for a Hydration and Brightness Boost

Hands cupping a brown dropper bottle labeled 'Oil' against a pink background.

"Vitamin C + HA skincare: hydration and brightness. Coverage: layering order, concentrations, skin types, cautions, tips."

Lucy Zimmerman
January 26, 2026

Ceramides

Ceramides in Skincare: Your Practical Guide to Types, Concentrations, and Barrier Repair

Silhouette of a person’s face illuminated by teal neon light against a dark background

"Ceramides in skincare: what they are. NP, AP, EOP types; concentrations in serums, creams, moisturizers; skin barrier repair."

Lucy Zimmerman
January 16, 2026