Skip to main content

Fatty Acid

OA (Oleic Acid)

Also known as: Oleic acid, OA, Omega-9, C18:1

B
Evidence

A monounsaturated omega-9 fatty acid abundant in olive oil. Primary fat of the Mediterranean diet, supporting cardiovascular health and reducing inflammation.

Last reviewed June 2026 · Evidence graded from peer-reviewed research, not editorial opinion. Educational only — not medical advice.

Find the best OA (Oleic Acid) supplements — free
See OA (Oleic Acid) products scored on dose & form, then track your intake in the app.
Open app →

Primary uses

  • Cardiovascular health
  • Cholesterol support
  • Anti-inflammatory
  • Brain health

How it works

  • Replaces saturated fat in cell membranes
  • Reduces LDL cholesterol oxidation
  • Improves HDL:LDL ratio
  • Modulates inflammatory gene expression
  • Supports brain myelin

Dosage

Typical range
15-25 g daily from diet
Timing
With meals
With food
As part of meals
Duration
Ongoing dietary component
Special populations
Beneficial for cardiovascular risk

Forms

  • Olive oil
  • Avocado oil
  • High-oleic oils

Safety

Common side effects

  • None at dietary levels

Contraindications

  • None

Evidence notes

Strong observational evidence from Mediterranean diet research

Grade B: Some human trials support key claims; further confirmation needed.

Related in Fatty Acid

Check a full stack

Formulate's free interaction checker lets you paste in any combination of supplements and medications at once — every pairing flags severity, timing, and cited evidence.

Open the checker

Where does OA (Oleic Acid) fit in your stack?

Answer two questions and get a stack graded on research — every ingredient scored on the evidence behind it, not the marketing.

Build my stack

2 questions · free · no account needed to start

Also on iPhone — get the free app

📬 Get new guides in your inbox

Evidence-based supplement guides, no spam

We send a short digest when new guides drop — nothing else. No affiliate pushes, no sponsored content, unsubscribe anytime.

Medical disclaimer. This page is educational and does not replace advice from a qualified healthcare provider. Individual needs and risks vary — consult a professional before starting, stopping, or combining supplements, especially if you are pregnant or nursing, taking medication, or managing a health condition.