Squalene

Squalene is a natural triterpene lipid involved in the biosynthesis of cholesterol and other sterol compounds. In the body it sits on the pathway that leads to cholesterol, bile acids, vitamin D, and steroid hormones. This does not make squalene harmful because it is connected with cholesterol. Cholesterol is needed for membranes, bile, hormones, and the nervous system, while synthesis and transport are tightly regulated.

Squalene is found in olive oil, amaranth oil, rice bran oil, some other plant oils, shark liver oil, and human sebum. In skincare, squalane is more commonly used: it is a more stable hydrogenated form that is easier to store and apply. Squalene and squalane are related, but they are not the same in nutrition, metabolism, or cosmetics. Skin claims should not be automatically transferred to oral squalene intake.

Role in the body

Squalene is an intermediate in the mevalonate pathway. This pathway is needed not only for cholesterol, but also for coenzyme Q10, dolichols, and other isoprenoid molecules. The body normally makes squalene itself, so it is not an essential nutrient like a vitamin or amino acid. Intake from food may be part of the food’s fat matrix, but it does not replace regulation of internal synthesis.

In skin, squalene is part of sebum and contributes to surface lipid protection. It can oxidize under ultraviolet light and pollution, so its skin role is not one-dimensional. It supports the barrier, but oxidized products may irritate sensitive skin. This is another reason why the word antioxidant does not explain the whole biology of a compound.

Sources in low-carb nutrition

For keto and LCHF, the most natural source of squalene is extra virgin olive oil. It provides not only squalene, but also monounsaturated fats, polyphenols, and flavor without carbohydrates. Amaranth oil contains squalene, while amaranth grain itself is starchy and usually does not fit strict keto. Shark liver oil has historically been used as a source, but it raises questions about sustainability, purity, and contaminants.

The practical message is simple. If the diet already contains good olive oil, greens, fish, eggs, protein, and vegetables, seeking squalene separately is usually unnecessary. It is not the single magic component of a Mediterranean-style diet. The value of olive oil comes from a whole package of fatty acids, polyphenols, replacement of ultra-processed fats, and the overall dietary pattern.

Supplements and claims

Squalene supplements are promoted for immunity, skin, liver, cholesterol, and antioxidant protection. The evidence behind such claims varies and is often weaker than the marketing. If someone has lipid issues, fatty liver disease, skin problems, or inflammation, it is more useful to assess diet, alcohol, sugar, insulin resistance, ApoB, liver enzymes, sleep, and medications. Squalene does not replace those steps.

Source quality also matters. Marine sources may differ in purity, while plant sources vary in concentration and oxidation. Oils and lipid supplements need proper storage because rancidity and oxidation worsen tolerance and flavor. If a supplement causes nausea, burping, diarrhea, or gallbladder discomfort, that matters more than label promises.

Squalene and cholesterol

Because squalene participates in cholesterol synthesis, it is sometimes mistakenly treated as a direct cause of high blood cholesterol. Dietary squalene does not work so simply. LDL, ApoB, and triglycerides depend on genetics, liver function, thyroid status, body weight, insulin resistance, fat composition, medications, and the whole diet. Olive oil, which contains squalene, is usually considered neutral or favorable for cardiovascular health when part of a good dietary pattern.

It is therefore wiser to look at the whole fat profile of the diet rather than one molecule. Squalene from food can be part of healthy low-carbohydrate cooking, especially through olive oil. Taking capsules for vague benefits without a clear reason is usually unnecessary. In nutrition, context is almost always stronger than one attractive compound.