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Fatty Acid

SDA (Stearidonic Acid)

Also known as: Stearidonic acid, Stearidonic, SDA omega-3, Ahiflower

B
Evidence

A plant-based omega-3 that converts to EPA 3-5x more efficiently than ALA. Found in ahiflower and echium oils, making it the most efficient plant omega-3 for EPA production.

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

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Primary uses

  • Plant-based EPA production
  • Anti-inflammatory support
  • Cardiovascular health
  • Vegan omega-3

How it works

  • Bypasses rate-limiting delta-6-desaturase step
  • Converts to EPA at 3-5x efficiency of ALA
  • Incorporated into cell membranes
  • Reduces inflammatory eicosanoids

Dosage

Typical range
500-2000 mg daily
Timing
With meals
With food
Yes, improves absorption
Duration
Ongoing supplementation for benefits
Special populations
Vegans seeking meaningful EPA levels

Forms

  • Ahiflower oil
  • Echium oil
  • Softgel

Safety

Common side effects

  • Generally well tolerated

Contraindications

  • None specific

Evidence notes

Emerging research shows efficient conversion to EPA

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

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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.