Barrier repair complex

Barrier repair complex is a marketing term for the group of ingredients in a formula intended to replenish the lipids and support of the skin's outer layer. Most versions centre on the three lipid families found naturally in the stratum corneum — ceramides, cholesterol and free fatty acids — because a mixture that mirrors skin's own lipid profile generally sits better on stressed skin than any single lipid used alone.

Around that core, formulators add supporting ingredients: niacinamide, panthenol, glycerin and other humectants, plant sterols, squalane, and occlusives to limit water loss. Some complexes carry trademarked names, which tells you nothing about how much of anything is present.

Wording on the front of a jar is not regulated, so read the INCI list rather than the claim, and remember that no complex outperforms consistent gentle cleansing and daily sun protection. Introduce one new product at a time, patch test if your skin is reactive, and see a dermatologist for irritation that does not settle.