The Weight of Oil Ingredients — How to Tell Squalane, Shea Butter, and Argan Oil Apart

When looking closely at cosmetic ingredient lists, you often come across names like squalane, shea butter, and argan oil (argan kernel oil). All three fall under the broad category of 'oil ingredients,' but the texture and role they actually create on the skin are quite different.

Without knowing this difference, it's easy to pick a product that doesn't suit the season or skin condition just because 'it's said to be oily.' Today, let's organize these three ingredients based on molecular structure and texture.

What oil ingredients do — differences in how they lock in moisture

Oil ingredients applied to the skin share one common role: preventing the moisture previously applied from evaporating from the skin's surface. This is often called 'moisture evaporation prevention,' but the method differs by ingredient.

Squalane has a structure similar to lipids that naturally exist in human sebum, so when applied, it tends to absorb without a sense of heaviness. Its molecular size is small and its skin affinity is high, forming a thin, light film.

Shea butter is a butter-type oil that is close to solid at room temperature, with long, highly saturated fatty acid chains. When placed on the skin, it forms a thicker, denser film than squalane, often requiring rubbing with the hands to melt it in as it's applied.

Argan kernel oil sits in between the two. Though it is a liquid oil, its fatty acid composition is on the heavier side, so it applies heavier than squalane but lighter than shea butter.

The 'right weight' that changes by season and skin condition

Even the same oil ingredient can feel different depending on when and on what skin it's used. In summer, when sweat and sebum are abundant, many say formulas centered on lightweight squalane feel less burdensome, while in dry winters or transitional seasons when flaking occurs, dense oils like shea butter play a role in covering the surface for longer.

However, this is only a general tendency, and some people feel the opposite depending on their skin type. Even oily skin with severe inner dryness may find rich oils comfortable, while some with dry skin prefer lighter formulas. Ultimately, one needs to understand the properties of the ingredients and then check directly on one's own skin.

How to check oil ingredients on the full ingredient list

The full ingredient list is arranged in order of highest to lowest concentration. Therefore, whether squalane, shea butter, or argan kernel oil appears near the front or only in small amounts near the back allows one to estimate how 'heavy' the formula actually is.

Also, when a single product combines several oil ingredients, it's worth checking whether the formula is designed to balance lighter and heavier ones together. A formula using only squalane and one combining squalane, shea butter, and argan oil show a clear difference in spreadability and finish.

How to use oils while reducing the burden

Even a cream containing heavy oil ingredients can feel less burdensome if you adjust the amount used and the areas applied. Rather than applying the same amount over the whole face, one can concentrate on areas with severe dryness like the cheeks and eye area, while applying only a small amount to the T-zone where sebum secretion is high.

Another method is the layering order. Some suggest that if you first let moisture-focused toners and ampoules fully absorb, then apply the oil-containing cream only as the last step, the oil can focus on its intended role of forming a film on the skin's surface, reducing the feeling of it sitting on top.

During warmer weather, reducing the amount used or spreading the same product more thinly is another way to adjust.

The final step — which cream to finish with?

The reason for considering the weight of oil ingredients is ultimately to choose a finishing formula suited to one's own skin. From this standpoint, when choosing a cream, what matters as much as the type of oil ingredient is how that oil is designed together with elasticity-care ingredients. 에르쯔틴 리제너레이티브 실트 크림 combines squalane, shea butter, argan kernel oil, and olive oil in a rich-type formula that covers the surface, while also containing adenosine, which has undergone functional review for wrinkle improvement. Rather than choosing based solely on the weight of the oil ingredient, checking which other ingredients that oil is paired with can also serve as one criterion for selection.

Reviewed by 아비쥬의원 의료진. (September 2, 2026)