Dihomo-gamma-linolenic acid
Useful mainly for people seeking the anti-inflammatory omega-6 pathway, usually via GLA-rich oils.
Quick decision guide
May help most
people seeking the anti-inflammatory omega-6 pathway, usually via GLA-rich oils
Common dosing range
GLA precursor 240–1,000 mg/day (direct DGLA is rare/unstandardized)
When to expect effects
Weeks to months
Watch out for
Direct DGLA has little human data; most evidence is for GLA precursors (borage, evening primrose)
What is it
Dihomo-gamma-linolenic acid (DGLA) is a 20-carbon omega-6 polyunsaturated fatty acid produced in the body by elongation of gamma-linolenic acid (GLA). It serves as a precursor for prostaglandin E1 (PGE1), which has anti-inflammatory and vasodilatory effects.
Is it worth it for you?
Use this as a quick fit check, not a diagnosis.
Worth considering if…
Probably skip if…
Evidence at a glance
| Goal | Effect | Best fit | Time |
|---|---|---|---|
rheumatoid arthritis symptoms Good Evidence | Modest | adults with rheumatoid arthritis using GLA-rich oils as an adjunct | Months |
atopic dermatitis (eczema) Limited Evidence | Small to inconsistent | people with mild atopic dermatitis trying a GLA oil | Weeks to months |
shifting eicosanoid balance (anti-inflammatory) Limited Evidence | Unclear | those interested in the omega-6 anti-inflammatory pathway | Weeks |
rheumatoid arthritis symptoms
- Effect
- Modest
- Best fit
- adults with rheumatoid arthritis using GLA-rich oils as an adjunct
- Time
- Months
atopic dermatitis (eczema)
- Effect
- Small to inconsistent
- Best fit
- people with mild atopic dermatitis trying a GLA oil
- Time
- Weeks to months
shifting eicosanoid balance (anti-inflammatory)
- Effect
- Unclear
- Best fit
- those interested in the omega-6 anti-inflammatory pathway
- Time
- Weeks
Evidence for 3 uses
AI-assisted evidence assessment — talk to your doctor before relying on any single supplement.
rheumatoid arthritis symptoms
Disease adjunctRCTs of GLA-rich oils (the dietary precursor to DGLA) at 2–3 g/day report modest reductions in joint pain and tenderness in rheumatoid arthritis, with benefit emerging over months. DGLA-derived eicosanoids (PGE1, 15-HETrE) are the proposed anti-inflammatory mediators. Evidence is for the GLA precursor rather than direct DGLA, and effects are adjunctive.
Bottom line: GLA (the DGLA precursor) modestly eases RA joint symptoms over months as an add-on, not a replacement therapy.
Evidence is mixed
Some trials show clear symptom relief while others find little benefit, and effects are slow and modest.
atopic dermatitis (eczema)
Supplement benefitGLA-rich oils (evening primrose, borage) have been studied for atopic dermatitis as DGLA precursors, with mixed and generally small results. Larger trials and reviews have not consistently shown meaningful improvement in itch or skin severity. Direct DGLA is not established for this use.
Bottom line: GLA precursors may help some eczema sufferers modestly, but trial results are inconsistent.
Evidence is mixed
Early positive trials were not confirmed by larger, better-controlled studies.
shifting eicosanoid balance (anti-inflammatory)
Mechanism onlyDGLA competes with arachidonic acid for COX/LOX enzymes and yields less inflammatory eicosanoids, which can shift inflammatory biomarkers. This is a mechanistic and biomarker-level rationale, not demonstrated relief of any specific condition. Clinical benefit beyond the joint and skin uses above is not established.
Bottom line: The favorable eicosanoid mechanism is real, but on its own it is a biomarker rationale rather than a proven clinical effect.
How it works
How to take it
What to track
2 commercial forms
Compare the main delivery options and what they’re best suited for.
DGLA (direct)
Specialty supplement; expensive.
Bypasses conversion step.
GLA from borage/EPO (precursor)
More common; cost-effective.
Converts to DGLA in body.
Safety
Know the common side effects, key cautions, and who should avoid it.
Common side effects
Who should avoid it
- People with bleeding disorders
- Those on anticoagulants without medical advice
- Pregnant or breastfeeding women (insufficient data for direct DGLA)
Pregnancy & breastfeeding
Insufficient data for direct DGLA; avoid unless advised by a clinician.
Interactions
Possible modest platelet effects at high doses may add to bleeding risk
Food sources
| Food | Amount | %DV |
|---|---|---|
| Animal products (small amounts) | Variable | — |
Animal products (small amounts)
- Amount
- Variable
- %DV
- —
Choosing a product
What to look for on the label — and what to be skeptical of.
Look for…
Be skeptical of…
Frequently asked questions
Should I take DGLA directly or GLA?⌄
GLA is more practical for most people — the body converts it well to DGLA. Direct DGLA is rare and expensive without clear advantage.
Is DGLA the 'good' omega-6?⌄
Yes, in the sense that its eicosanoid products are anti-inflammatory, unlike arachidonic acid products. The body produces both from dietary precursors.
References by claim
rheumatoid arthritis symptoms
atopic dermatitis (eczema)
shifting eicosanoid balance (anti-inflammatory)
Mustonen et al., 2023 — PMC (2023) link
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Coming to App StoreDisclaimer: These statements have not been evaluated by the FDA. This page is educational, not a substitute for personalized medical advice. Evidence grades are AI-assisted assessments — talk to your doctor before starting any new supplement, especially if you’re pregnant, breastfeeding, on medications, or managing a chronic condition.