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Omega-9 monounsaturated fatty acid (oleic acid)

Monounsaturated fatty acids

ATC code: A11JA(Other vitamins, minerals, and nutraceuticals (local hierarchy))

Updated · Methodology

Indications

C

Dyslipidemia

Individual decision

Oleic acid lowers cholesterol as part of the diet, not as a capsule. In the 2018 PREDIMED trial, a Mediterranean diet with extra-virgin olive oil (50 g/day) cut major cardiovascular events by 30 % compared with a standard diet in high-risk patients. The Presidential Advisory 2017 recommends replacing saturated fat with monounsaturated and polyunsaturated fats. Omega-9 capsules do not reproduce the diet effect and have no place in international dyslipidaemia guidelines – statins and olive oil in the kitchen do the work, not the supplement.

Sources

  1. PREDIMED: Primary Prevention of Cardiovascular Disease with a Mediterranean Diet Supplemented with Extra-Virgin Olive Oil or Nuts (2018)
  2. AHA: Dietary Fats and Cardiovascular Disease: A Presidential Advisory (2017)

ICD-10: E78 · ICD-11: 5C80

Marketing claims without evidence base

The drug is promoted for these uses outside international guidelines. Each entry below is analyzed against AEMPS, FDA, EMA, Cochrane and major RCTs.

D

Anti-aging and longevity

Not recommended

Omega-9 (oleic acid) is a monounsaturated fatty acid abundant in olive oil. Supplements promote it for slowing aging and extending lifespan. Convincing benefit for this use has not been shown, and there is no solid evidence behind omega-9 as an anti-aging agent. Aging is shaped far more by sleep, a diet rich in vegetables and fish, regular movement, and not smoking.

Sources

  1. PREDIMED: Primary Prevention of Cardiovascular Disease with a Mediterranean Diet Supplemented with Extra-Virgin Olive Oil or Nuts (2018)
D

Cardiovascular prevention through supplements

Not recommended

Omega-9 capsules are sold as a cardioprotective supplement, leaning on evidence about olive oil within the Mediterranean diet. The diet-to-capsule extrapolation has not been made: no large RCT has shown a cardiovascular benefit from isolated oleic-acid supplementation. Oleic acid is non-essential – the body synthesises it from stearic acid. If omega-9 capsules were proposed for cardiovascular prevention, consider seeking a second opinion: prevention is built on the Mediterranean diet, smoking cessation, blood-pressure and lipid control, and physical activity.

Sources

  1. AHA: Dietary Fats and Cardiovascular Disease: A Presidential Advisory (2017)
  2. PREDIMED: Primary Prevention of Cardiovascular Disease with a Mediterranean Diet Supplemented with Extra-Virgin Olive Oil or Nuts (2018)
How to read tiers A–F
  • AStrong evidence – first or second line in international guidelines
  • BRecommended in selected cases
  • CStudy data contradict each other
  • DBenefit not proven, no documented harm
  • FDocumented harm, or risk without benefit

Mechanism of action

Oleic acid is a monounsaturated omega-9 fatty acid, the main lipid in extra-virgin olive oil (about 70 % of the profile) and the Mediterranean diet. The body synthesises oleic acid from stearic acid through stearoyl-CoA desaturase-1, so it is not essential. Replacing saturated fat with omega-9 in the diet lowers cholesterol – confirmed by the 2018 PREDIMED trial in a high cardiovascular-risk population.

Safety

Contraindications

  • Allergy to olive or the source plant oil

Common adverse effects

  • Mild nausea on an empty stomach, oily-aftertaste belching

Pregnancy: can you take Omega-9 monounsaturated fatty acid (oleic acid)?

Extra-virgin olive oil is a normal part of the Mediterranean diet during pregnancy and is recommended by SEGO in antenatal nutrition. A standalone omega-9 capsule supplement is not needed in pregnancy.

Breastfeeding: can you take Omega-9 monounsaturated fatty acid (oleic acid)?

Oleic acid reaches breast milk through the maternal diet; standalone omega-9 capsules are not required for nursing mothers.

Calculate RID

Reference information, not a clinical decision. Discuss feeding pauses or changes with your physician or an IBCLC.

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Frequently asked

What is Omega-9 monounsaturated fatty acid (oleic acid) used for?

Omega-9 monounsaturated fatty acid (oleic acid) is evaluated for the following indications with varying evidence strength: Dyslipidemia (evidence tier C), Cardiovascular prevention through supplements (evidence tier D), Anti-aging and longevity (evidence tier D). See the full indication matrix with dosing and citations above on this page.

What are the side effects of Omega-9 monounsaturated fatty acid (oleic acid)?

Common side effects of Omega-9 monounsaturated fatty acid (oleic acid) (≥ 1 in 100): Mild nausea on an empty stomach, oily-aftertaste belching. See the Safety section for uncommon and serious reactions.

Is Omega-9 monounsaturated fatty acid (oleic acid) safe during pregnancy?

Extra-virgin olive oil is a normal part of the Mediterranean diet during pregnancy and is recommended by SEGO in antenatal nutrition. A standalone omega-9 capsule supplement is not needed in pregnancy.

Is Omega-9 monounsaturated fatty acid (oleic acid) compatible with breastfeeding?

Oleic acid reaches breast milk through the maternal diet; standalone omega-9 capsules are not required for nursing mothers.

Who should not take Omega-9 monounsaturated fatty acid (oleic acid)?

Omega-9 monounsaturated fatty acid (oleic acid) is contraindicated in: Allergy to olive or the source plant oil. Full list in the Safety section.

Other drugs in this group

Panax ginseng (Korean/Chinese ginseng), Pantothenic acid, Pyrroloquinoline quinone (PQQ), Propolis (bee product), Royal jelly, Vitex agnus-castus (chasteberry, monk's pepper), Chaga (Inonotus obliquus), Indole-3-carbinol (I3C)