When it comes to natural compounds that bridge the gap between internal wellness and external beauty, squalene stands out. Found in olive oil, shark liver, and even your own skin, this fascinating lipid is gaining serious attention in both the dietary supplement and cosmetic industries. Whether you are considering squalene oil for its potential health benefits or looking to add it to your skincare routine, this guide breaks down everything you need in simple, straightforward terms.
What Exactly Is Squalene?
Squalene is a natural organic compound classified as a triterpenoid. In simple terms, it is a type of fat molecule that your body actually produces on its own - specifically, your liver synthesizes squalene as a precursor to making cholesterol [1]. That might sound concerning, but cholesterol itself is essential for building cell membranes and producing hormones; squalene simply sits earlier in that production chain.
Beyond your own body, squalene is found throughout nature. It is particularly abundant in:
- Olive oil contains approximately 3.6 to 9.6 mg of squalene per gram of extra virgin olive oil.
- Shark liver oil can be up to 40% squalene by weight.
- Wheat germ oil, rice bran oil, and amaranth seed oil – plant‑based sources that offer sustainable alternatives.
Interestingly, your skin also produces squalene naturally. It is a key component of your skin's sebum - the waxy, oily substance that keeps your skin moisturized and protected from environmental stressors. However, your body's natural squalene production tends to decline as you age, which is one reason why supplementing with squalene oil has become popular in both ingestible and topical forms.
Squalene for Health: What Can It Do as a Dietary Supplement?
People take squalene supplements for a variety of reasons. Although research is still evolving, several key benefits have emerged from scientific studies.
Cardiovascular Support
One of the most promising applications of squalene is in supporting heart health. Studies suggest that squalene can help reduce LDL cholesterol levels (the "bad" cholesterol) and lower overall cholesterol in the blood [1][2]. Lower LDL levels mean less fatty buildup in your arteries, which translates into a reduced risk of heart attacks and strokes.
A comprehensive review published in 2025 in the journal Problems of Biological, Medical and Pharmaceutical Chemistry emphasizes that squalene possesses hypolipidemic (cholesterol‑lowering), cardioprotective, antioxidant, and anti‑inflammatory properties [2]. Scientific studies have demonstrated that squalene supplementation can reduce levels of LDL cholesterol and triglycerides, enhance HDL cholesterol, and decrease oxidative stress - all of which are key factors in preventing cardiovascular diseases (CVDs) [3][2].
Cancer-Fighting Potential
Squalene has attracted particular attention for its anticancer properties. A 2025 research study published in the International Journal of Molecular Sciences found that squalene encapsulated in PLGA nanoparticles (a delivery system) demonstrated an antiproliferative effect on human colon carcinoma Caco‑2 cells through apoptosis (programmed cell death) by altering redox balance. The researchers concluded that this suggests squalene's potential as a functional food ingredient for colorectal cancer prevention [4].
Another 2024 study in Cell Communication and Signaling assessed the potent anti‑metastatic properties of a newly synthesized amphiphilic squalene derivative in melanoma, the most fatal skin cancer. Administration of this squalene derivative (25 mg/kg) significantly decreased tumor burden in the lungs and inhibited metastasis‑associated proteins in a mouse model [5].
Immune System Support
Squalene is a natural immunostimulant, meaning it helps the body fight infections and inflammation. In fact, squalene is already used in vaccines as a key component of adjuvants - substances that boost the body's immune response to the vaccine. Squalene‑based emulsions (such as MF59 and AS03) are included in influenza vaccines and certain COVID‑19 vaccines to make them more effective.
Antioxidant & Anti-Inflammatory Properties
Oxidative stress - basically, an overabundance of harmful free radicals in the body - is a driver of chronic diseases like heart disease, diabetes, and neurodegenerative conditions. Squalene acts as an antioxidant, protecting cells from free radical damage. Additionally, it helps dial down inflammation by influencing key inflammatory signaling pathways in the body [1][2].
Squalene in Cosmetics: Why Is It So Good for Your Skin?
Now let's talk about what squalene oil can do for your face and body. If you have ever looked at the ingredient list of a high‑end moisturizer or serum, you might have seen "squalane" - the hydrogenated, more stable cousin of squalene. But squalene itself also has impressive skincare benefits.
1. Natural Moisturization
Squalene is a major component of human sebum, meaning your skin already knows exactly what to do with it. It helps lock in moisture without leaving a greasy residue. Because it is so similar to your skin's own oils, squalene is highly compatible and easily absorbed.
2. Protection Against UV Damage
Sun exposure is one of the biggest causes of premature skin aging (photoaging). A 2025 study published in the Journal of Nanobiotechnology found that a squalene‑based oleogel successfully decreased epidermal thickness, increased dermal thickness, and promoted the expression of elastin, collagen, and skin barrier markers when applied to UVB‑irradiated skin [6].
Another 2025 study on squalane (the stable form of squalene) showed that it protects human skin cells against UVA‑induced oxidative stress, inflammation, and collagen breakdown. The study also found that squalane stimulates wound healing by helping skin cells migrate and repair themselves after UV exposure.
3. Anti‑Inflammatory & Skin Barrier Support
Squalene helps calm inflammation in the skin, making it beneficial for conditions like eczema and psoriasis. It also strengthens the skin barrier, helping to lock moisture in while keeping irritants and bacteria out.
A quick note on squalene vs. squalane: Squalene is the natural, unsaturated form. However, squalene tends to oxidize (go bad) relatively quickly. That is why many skincare products use squalane, squalene that has been hydrogenated to make it more stable and resistant to oxidation. Both forms offer similar skin benefits, but squalane is generally preferred for commercial skincare products because it has a longer shelf life.
Sources of Squalene: Shark, Plants, and Sustainability
Traditionally, most commercial squalene came from shark liver oil. However, there has been a major shift toward plant‑based and fermentation‑derived squalene - driven by both environmental concerns and consumer demand for sustainable, cruelty‑free products.
Plant sources rich in squalene include:
- Amaranth seed oil – contains up to 5–8% squalene.
- Olive oil – contains up to 0.8–1.2% squalene.
- Rice bran oil and wheat germ oil also contain significant amounts.
Today, fermentation‑based squalene (produced by engineered yeast fed with plant sugars) offers a highly sustainable, scalable, and pure alternative to shark‑derived squalene. This method avoids overfishing and provides consistent quality, making it a popular choice for cosmetic and pharmaceutical manufacturers.
Pro tip: When shopping for squalene oil products (whether supplements or skincare), look for labels that specify plant‑based or fermentation‑derived squalene to support sustainable sourcing.
Is Squalene Safe? Side Effects and General Precautions
Squalene is generally recognized as safe for both dietary supplement and cosmetic use. It is produced naturally by your own body, and dietary squalene has been consumed safely for centuries through olive oil and other foods.
- Typical dietary intake – The average North American diet provides about 30 mg of squalene per day. People who follow a Mediterranean diet (rich in olive oil) may consume 200 to 400 mg daily.
- Supplement dosages – Research suggests that a preventative dose to help reduce cancer risk is roughly 300 mg per day, and higher doses are generally well tolerated [1].
- Topical safety – A 2023 review by the Expert Panel for Cosmetic Ingredient Safety confirmed that squalane and squalene are safe as cosmetic ingredients in the practices of use and concentration as described in the report.
- Potential mild side effects – Some individuals may experience minor digestive discomfort when first taking squalene supplements, though this is relatively uncommon.
- Talk to your doctor – As with any supplement, pregnant or nursing women and individuals taking prescription medications should consult a healthcare professional before adding squalene to their routine.
The Bottom Line
Whether you are looking to support your cardiovascular health, boost your immune system, or give your skin a natural moisture boost, squalene oil offers a compelling, science‑backed option. From helping to reduce LDL cholesterol and protect against cancer‑related DNA damage to shielding your skin from UV‑induced aging, this humble lipid proves that sometimes the simplest molecules can have the biggest impact.
For supplement manufacturers, formulators, and skincare brands, high‑purity squalene oil - especially plant‑based or fermentation‑derived sources - is becoming an essential ingredient. Whether you are developing the next generation of immune‑supporting supplements or crafting a clean‑beauty moisturizer, high‑quality squalene oil from a reputable supplier ensures consistent results and aligns with modern consumer values.
References
[1] "Research Breakdown on Squalene." Examine.com, Last Updated: August 29, 2025.