Barrier Function
Barrier Function — the skin's ability to keep water in and unwanted substances out, largely carried out by the outermost layer of the epidermis. A healthy barrier helps maintain hydration and comfort and defends against irritants and microbes, while a compromised one can lead to dryness, sensitivity, and redness.
Key points
- The stratum corneum acts like a brick-and-mortar wall of skin cells and surrounding lipids.
- A strong barrier limits transepidermal water loss to help keep skin hydrated.
- Harsh cleansing, over-exfoliation, and environmental stress can weaken barrier function.
- Ingredients like ceramides, fatty acids, and humectants are commonly used to support barrier health.
Frequently asked
What are signs of an impaired skin barrier?
Common signs include increased dryness, tightness, redness, stinging from products, and heightened sensitivity, though these can have other causes as well.
How can I support my skin barrier?
Gentle cleansing, avoiding over-exfoliation, and using barrier-supporting ingredients like ceramides and humectants are widely recommended everyday steps.
Related topics
This is a foundational entry in the SYNC Skin Encyclopedia and is expanded over time. Educational information only — not medical advice.
