Why is walnut oil specifically used for brittle, breaking hair? — Restorative nut oil for breaking hair 3x15 ml - DNC

Walnut oil is chosen for brittle hair mainly because of its naturally occurring fatty acids. Hair is covered by a lipid layer that keeps the cuticle flat and the strand flexible. When that layer is depleted — by frequent washing, heat styling, coloring, sun and wind — the cuticle becomes rough and raised. The strand then catches on neighboring hairs, frays and snaps more easily under tension. A lipid-rich oil coats the surface of the fiber, which helps the outer layer lie flatter. The result is less moisture loss from the inside of the strand and a smoother, more polished feel on the outside.

Flexibility is the second benefit. Dry, brittle hair bends poorly and tends to break exactly where it is stressed. The fatty acids help the strand bend a little more easily, so it is more likely to flex under tension than to snap. This is why walnut oil is commonly linked to dry, stressed or over-processed hair rather than to hair that is already strong.

An oil format also allows targeted use. The mid-lengths and ends are the oldest part of the hair and carry the most accumulated damage, so a few drops placed there have a direct effect on the most fragile zone — which is harder to achieve with a shampoo or mask that is washed out everywhere.