Oleic Acid (Omega-9 · C18:1 · Mediterranean Monounsaturated Fatty Acid)
| CAS No. | 112-80-1 |
| Class | Lipid · Monounsaturated Fatty Acid · Omega-9 · C18:1 n-9 |
| Source | Olea europaea (Olive) — fruit (55–83% of olive oil fatty acid profile); also high-oleic sunflower, avocado, almond oils |
| Claim strength | High |
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The olive tree has been cultivated in the Mediterranean basin for at least 6,000 years. The PREDIMED trial (2013) demonstrated a 30% reduction in major cardiovascular events with a Mediterranean diet supplemented with extra virgin olive oil. Oleic acid, constituting 55–83% of olive oil's fatty acid profile, is the primary candidate compound. As a formulation vehicle, oleic acid is the most significant lipid carrier in pharmaceutical and nutraceutical oleaginous formulations.
Oleic Acid for Cardiovascular Health, Lipid Management & Formulation — Evidence
Cardiovascular health — LDL and HDL management: Replacing saturated fatty acids with oleic acid consistently improves the LDL:HDL cholesterol ratio in dietary substitution trials. Oleic acid reduces LDL oxidation and improves arterial endothelial function. The FDA has granted a qualified health claim for high-oleic oils and reduced cardiovascular risk. Claim strength: High.
Mediterranean diet evidence: Extra virgin olive oil at 4 tablespoons per day providing approximately 50g oleic acid significantly reduced major cardiovascular events in PREDIMED. Claim strength: High.
Carrier oil for lipophilic actives: Oleic acid-rich carrier oils serve as the lipid vehicle for fat-soluble actives including astaxanthin, lycopene, Vitamin D, Vitamin E, CoQ10, and curcumin. Claim strength: High (penetration enhancement).
Dosage & Formulator Notes
For nutraceutical and cosmetic formulations, food-grade or pharmaceutical-grade oleic acid (>90% purity, confirmed by GC) is required. Confirm free fatty acid content, peroxide value, and acid value on the CoA. For supplement applications, oleic acid is typically delivered as part of a carrier oil rather than isolated oleic acid.
Pairs with: Astaxanthin (oleic acid-rich softgel carrier), Vitamin D and K2 (oil-based delivery), CoQ10 (lipid-phase solubility enhancement), omega-3 fatty acids (complementary fatty acid profile).
Frequently Asked Questions
Why is oleic acid considered heart-healthy when it is a fat?
Oleic acid improves LDL:HDL ratio when replacing saturated fat — selectively lowering LDL without reducing HDL. It also reduces LDL oxidation, which initiates atherosclerosis.
What is the difference between oleic acid and omega-3 fatty acids?
Oleic acid is a non-essential monounsaturated omega-9 that improves LDL:HDL ratio. Omega-3s are essential polyunsaturated fatty acids that reduce triglycerides and support brain and retinal structure. Not interchangeable.
Is isolated oleic acid the same as olive oil?
No. Olive oil also contains polyphenols (oleocanthal, oleuropein), squalene, phytosterols, and Vitamin E. Isolated oleic acid provides fatty acid cardiovascular benefits without polyphenol content.
What is high-oleic sunflower oil?
Sunflower varieties bred to have 80–90% oleic acid content — similar fatty acid profile to olive oil but without polyphenols. Used as an oxidatively stable carrier in pharmaceutical and nutraceutical softgel formulations.
Claim-strength scale – High = multiple human studies; Moderate = a few trials; Emerging = early lab data.
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