Lanolin Oil

Lanolin oil is the liquid fraction of lanolin — a waxy substance secreted by the sebaceous glands of wool-bearing sheep and collected from freshly shorn fleece during scouring. It is recovered as a by-product of shearing rather than of slaughter, but it is still an animal-derived material, so it is not suitable for vegans.

Raw lanolin is thick, sticky and difficult to spread. To produce lanolin oil, refiners fractionate it, separating out the harder, higher-melting wax esters and keeping the fluid portion behind. The result pours and spreads far more easily than whole lanolin and feels noticeably lighter on the skin, while keeping most of the parent material's character.

Chemically, lanolin is almost entirely esters — roughly 97% by weight — rather than the triglycerides that make up plant oils. Those esters divide between wax esters, built from long-chain fatty alcohols, and sterol esters, in which cholesterol is the single largest alcohol. Hundreds of individual fatty acids and alcohols have been identified in it, and cholesterol also occurs naturally in the outermost layer of human skin.

On an ingredients list it appears as Lanolin Oil, where it is used as an emollient and hair conditioning agent. It turns up most often in lip balms and lipsticks, rich hand and face creams, cuticle balms, nipple balms and body oils. Compared with plant oils and silicones it is relatively uncommon in modern formulations, partly because of its animal origin and partly because of its reputation as an allergen.

Two mechanisms do most of the work.

The first is occlusion. Lanolin oil is non-volatile and only partly taken up by the skin's surface layers, so a thin film remains on top and slows the rate at which water evaporates outwards — what formulators call transepidermal water loss. Less water escaping means more water held in the upper layers, which is why the softening effect shows up within hours rather than weeks: skin looks plumper and feels more supple almost immediately.

The second is lipid compatibility. Because lanolin's mix of esters and alcohols overlaps with the lipids that sit between the skin's surface cells — cholesterol in particular — it blends into that surface film rather than resting on it as a separate, unrelated layer the way a purely mineral occlusive does. This is generally thought to explain why lanolin feels less like a coating than its occlusive strength would suggest.

There is a third, smaller effect: lanolin alcohols behave as water-in-oil emulsifiers, meaning a lanolin-based film can hold water within itself as well as trapping the water already present. The action is entirely physical and confined to the skin's surface — nothing about it changes how skin is built.

Lanolin oil belongs at the end of a routine, not the beginning.

• Apply to slightly damp skin, straight after cleansing or over a hydrating serum — there is more water at the surface for the film to hold onto.
• Use it last, over your moisturiser rather than under it. Anything layered on top of an occlusive has a much harder time getting through.
• Start with a very small amount — roughly a grain of rice for the whole face. Warming it between your fingertips first makes it spread considerably further.
• Daily use suits most people. On the body, evenings work best, when you are not layering makeup or sun protection over the top.
• It comes into its own on lips, cuticles, elbows, heels and stubborn dry patches, where a richer finish is not a drawback.
• If your skin is oily or congestion-prone, apply it only where skin actually feels tight rather than all over.
• Store away from heat and direct sunlight — refined lanolin oil is stable, but warmth will thin it further.