Herb & supplement monograph

Oleic Acid Drug Interactions, Uses, Effectiveness, Safety & More

Medically reviewed by Dr. Brian Staiger, PharmD, BCPS ·Updated June 2026

What is this page for?

First and foremost: how Oleic Acid interacts with medications. The heart of this page is the interaction list — every drug Oleic Acid is known to interact with, and how serious each one is.

But these pages have grown well beyond that into a full monograph — what Oleic Acid is, what people use it for and how strong the evidence is, its safety and side effects, and answers to the questions we’re asked most — written and reviewed by the clinical staff at HelloPharmacist. It’s educational information from our licensed clinical databases, not medical advice, and we don’t sell or endorse products. Our editorial policy

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Oleic Acid Drug Interactions: The Bottom Line

From the HelloPharmacist Editorial Team · Updated July 2026

Based on the available evidence, the overall risk of a clinically significant Oleic Acid drug interaction appears low for most people. None of the listed interactions are rated major, and the evidence behind them comes mostly from preliminary or theoretical research rather than well-documented human studies.

Interactions deserving the most attention

The interaction that deserves the most attention involves diabetes medications. Early research in people with type 2 diabetes found that a diet rich in oleic acid from olive oil lowered fasting blood sugar compared with a diet based on a different plant oil. Because blood sugar is closely monitored in people taking these medicines, adding oleic acid could in theory nudge levels lower than expected. It is not yet known whether oleic acid supplements have the same effect as a diet rich in this fat.

What the rest of the list means

Although oleic acid appears alongside a large number of medications, that does not mean each combination is harmful. These pairings are all rated moderate, and the concern rests largely on a predicted effect on blood sugar rather than on proven problems in people. For most medicines on the list, no clinically meaningful change has been shown.

Check your medications against Oleic Acid

Based on HelloPharmacist’s Oleic Acid interaction data and reviewed under our editorial standards.

Interaction report

Drugs that interact with Oleic Acid

86 medications have a known interaction with Oleic Acid, graded by severity. Select any drug for the full evidence-based detail.

Don’t want to scroll the list? Just ask.

Tell us the medications you take and we’ll check each one against Oleic Acid using our pharmacist-reviewed interaction data.

AI summaries are generated from our Oleic Acid interaction data for education only — always confirm with your pharmacist. How we use AI

2,830 drugs

Read The List Like a Pharmacist

What Severity, Likelihood & Evidence Mean

Severity — How Serious It Can Be

Major. Clinically significant; generally best avoided, or used only under direct professional supervision.
Moderate. May need monitoring, a dose adjustment, or separating the times you take each one.
Minor. Generally not clinically significant, but still worth noting and mentioning to your pharmacist.
No known interaction. Checked against our sources with nothing documented — not the same as proven safety.

Likelihood — How Well It’s Documented

Likely. Well-controlled human studies have demonstrated the likely existence of this interaction
Probable. Interaction has not been documented in well-controlled studies, however, the interaction has been demonstrated in some small human studies or in controlled animal studies in conjunction with multiple case reports.
Possible. Interaction has been documented in animal or in lab research, or the interaction has been documented in humans but is limited to case reports or conflicting clinical research exists
Unlikely. Interaction has been demonstrated in animal or in lab research but has been shown not to occur in humans.

Where This Data Comes From

Interaction records are evidence-graded and sourced from the Natural Medicines database (TRC Healthcare), the same reference used by pharmacists and hospitals.
Each drug listed above links to the full report for that exact Oleic Acid combination — clinical detail, likelihood, evidence level, and citations.
Content is reviewed by licensed HelloPharmacist pharmacists — see our data sources and editorial standards.

The big picture

The kinds of drugs Oleic Acid affects

Every type of medication (drug category) Oleic Acid is known to interact with. Open any category for the detail — or search your exact drug in the checker above.

All 1 drug category Oleic Acid interacts with

Antidiabetes Drugs

Theoretically, oleic acid might increase the effects of antidiabetes drugs. Preliminary clinical research in patients with type 2 diabetes taking oral hypoglycemic drugs shows that eating a diet rich in oleic acid from olive oil decreases fasting blood glucose levels when compared to eating a diet rich in linoleic acid from sunflower oil. It is unknown if taking oleic acid supplements would have this effect or if this change is clinically significant. Until more is known, use caution. Dose adjustment may be necessary. Some antidiabetes drugs include glimepiride (Amaryl), glyburide (DiaBeta, Glynase PresTab, Micronase), insulin, metformin (Glucophage), pioglitazone (Actos), rosiglitazone (Avandia), and others.

Likelihood Possible Evidence B

Monograph

Oleic Acid: Uses, Safety & Side Effects

Medically reviewed by Dr. Brian Staiger, PharmD, BCPS · Reviewed June 2026 ·

The bottom line

Oleic acid is a heart-healthy monounsaturated fat found mainly in olive oil, canola oil, avocados, and nuts. As part of a Mediterranean-style diet, it is widely viewed as a healthier replacement for saturated fats, but it is still a calorie-dense fat, so amounts matter. Talk to your pharmacist or doctor before using concentrated supplements.

Part used: Fatty acid found in plant oils and animal fats
Common forms: Olive oil, capsules, softgels, cooking oils, skin products

People commonly use it for

Heart health
Healthy cooking fat
Skin moisturizing
Part of the Mediterranean diet
Anti-inflammatory support

Popular and traditional uses — not proof it works. See “Uses & effectiveness” below for the evidence.

Safety at a glance

OverallLikely safe

Generally recognized as safe when consumed in normal amounts from foods like olive oil.

PregnancyInsufficient reliable information

Insufficient reliable information available; avoid using in amounts greater than those commonly found in foods.

Read the full pregnancy detail

BreastfeedingInsufficient reliable information

Insufficient reliable information available; avoid using in amounts greater than those commonly found in foods.

Read the full breastfeeding detail

Pregnancy & breastfeeding ratings are from Natural Medicines (Therapeutic Research Center). Safety guidance is general; always confirm with your pharmacist or doctor for your situation.

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Overview

Oleic acid is a type of fat called a monounsaturated fatty acid (often labeled an omega-9 fat). It is one of the most common fats in the human diet and in the human body.

It is found in many plant and animal sources, but it is especially abundant in olive oil. Other rich sources include canola oil, peanut oil, avocados, almonds, and other nuts. Because olive oil is a centerpiece of the Mediterranean diet, oleic acid is often discussed when people talk about heart-healthy eating.

Most people get oleic acid simply by eating these foods. It is also sold as a softgel or oil supplement, and it appears in many skin care and cosmetic products as a moisturizing ingredient.

How it works

Oleic acid is a building block of fats in the diet and in the body. When it replaces saturated fat in meals, it tends to lower LDL ("bad") cholesterol while having a more favorable effect on overall cholesterol balance.

Laboratory and animal studies suggest oleic acid may influence cell membranes, affect how certain genes related to inflammation behave, and act as a source of energy. These mechanisms are still being studied, and findings in cells or animals do not always translate to clear benefits in people.

In skin products, oleic acid works partly by helping other ingredients pass through the skin and by adding oil to soften the surface.

Effectiveness

Does Oleic Acid work?

Here’s what the research actually shows for each use — graded by Natural Medicines and reviewed by Dr. Brian Staiger, PharmD.

Evidence overview · 15 uses evaluated

2 Possibly effective 13 Insufficient evidence

How to read these evidence grades

Natural Medicines’ 7-point scale. We show each rating’s label word-for-word.

1EffectiveStrong, consistent evidence it works.

2Likely EffectiveGood evidence, though not yet conclusive.

3Possibly EffectiveSome evidence suggests a benefit.

4Possibly IneffectiveSome evidence it may not help.

5Likely IneffectiveFairly strong evidence it doesn’t help.

6IneffectiveStrong evidence it doesn’t work.

7Insufficient Reliable Evidence to RateToo little research to say either way.

Possibly Effective Coronary heart disease (CHD)