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Borage Seed Oil (Borago officinalis)
A seed oil unusually rich in gamma-linolenic acid (GLA). The honest evidence: Cochrane reviews found borage oil is NOT an effective treatment for atopic eczema, while GLA oils show only a modest benefit for rheumatoid arthritis symptoms. A small skin-barrier signal exists. Overall an emerging, niche supplement.
What the evidence says
Most Borage Oil studies are mechanism or observational rather than RCTs that measure a clinical effect — keep findings provisional.
Most evidence is from medium-quality randomised trials published 1993–2013 with a typical study size of 37 participants.
Based on 4 studies · 1 RCT · 1,662 total participants
Confidence
LowBy outcome
Borage Oil has an evidence score of 3.5/10 — emerging evidence based on 4 indexed studies. A seed oil unusually rich in gamma-linolenic acid (GLA). The honest evidence: Cochrane reviews found borage oil is NOT an effective treatment for atopic eczema, while GLA oils show only a modest benefit for rheumatoid arthritis symptoms. A small skin-barrier signal exists. Overall an emerging, niche supplement. Representative study: PMID 23633319.
The commonly studied dose of Borage Oil is 1-3g/day borage oil providing roughly 240-1400mg GLA (higher GLA doses used in RA trials). Individual needs vary — start at the lower end of the range and adjust based on how you respond.
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Last reviewed June 2026 · evidence from 4 studies · how we score
This information is for educational purposes only. It is not a substitute for professional medical advice. Always consult a qualified healthcare provider before starting, stopping, or changing any supplement or medication.
Borage (starflower) seed oil contains the highest natural concentration of gamma-linolenic acid (GLA, ~20-24%) of any common seed oil — more than evening primrose oil. GLA is an omega-6 fatty acid that the body converts to dihomo-gamma-linolenic acid (DGLA), a precursor to anti-inflammatory series-1 prostaglandins. This mechanism drove decades of interest in borage oil for inflammatory skin and joint conditions. The honest evidence, however, is underwhelming. A Cochrane systematic review of oral evening primrose and borage oils concluded that borage oil lacks effect on atopic eczema, performing no better than placebo. For rheumatoid arthritis the picture is slightly more favorable: a Cochrane herbal-therapy review found moderate evidence that GLA-containing oils (borage, evening primrose, blackcurrant) afford some symptom relief, and a small double-blind RCT of high-dose GLA from borage oil reduced tender and swollen joints. There is also a modest signal that borage oil improves skin-barrier function (reduced transepidermal water loss) in people with dry/aging skin. Taken together, borage oil is an emerging, niche supplement with a clear negative verdict for eczema and only modest, dose-dependent benefit for joint inflammation.
Gamma-linolenic acid is elongated to dihomo-gamma-linolenic acid, a precursor of anti-inflammatory series-1 prostaglandins (e.g. PGE1).
GLA contributes to epidermal fatty-acid composition, which may support stratum corneum barrier function in people with impaired delta-6-desaturase activity.
Proposed suppression of pro-inflammatory cytokine (e.g. TNF-alpha) signaling, though clinical relevance is modest.
How Borage Oil works — from molecular targets to health outcomes. Click an edge to see supporting research.This visualization is in beta — pathways are being refined and expanded.
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1-3g/day borage oil providing roughly 240-1400mg GLA (higher GLA doses used in RA trials)
Take with food
| Form | Type |
|---|---|
| 💊Borage oil softgels (standardized GLA, PA-free) | Recommended |
| 💧Liquid borage oil | Alternative |
| 💧Evening primrose oil (lower GLA alternative) | Alternative |
Choose products certified free of pyrrolizidine alkaloids (PAs), which are hepatotoxic plant compounds that can occur in unrefined borage products.
Compare Borage Oil vs Evening Primrose Oil →Minimum: 12 weeks
Optimal: 24 weeks
Cycling: Not required
Note: Take with food. Benefits, where present, build over 3-6 months of consistent use.
Dose-response data unavailable. The current published research for Borage Oil does not provide sufficient dose-specific outcome data to generate reliable dose-response curves.
Refer to the Dosage & Timing section above for recommended dose ranges based on available evidence.
GLA oils including borage showed reduced pain and disability in rheumatoid arthritis (moderate evidence).
Cochrane review found oral borage oil is not effective for atopic eczema versus placebo.
Modest reduction in transepidermal water loss in people with dry/aging skin.
Mild, transient gastrointestinal effects are the most common side effect.
Avoid — GLA's prostaglandin effects raise a theoretical labor-inducing concern, and pyrrolizidine alkaloids in some products are hepatotoxic and unsafe in pregnancy.
Use caution due to a theoretical seizure-threshold concern with GLA oils.
Discuss with a clinician due to possible additive bleeding risk.
GLA may affect platelet aggregation; theoretical additive bleeding risk with warfarin, DOACs, or antiplatelet agents.
GLA oils have a theoretical concern for lowering seizure threshold; use caution in people with epilepsy or on such drugs.
Concurrent NSAID use may blunt the GLA-mediated prostaglandin pathway, theoretically reducing benefit.
Tip: Take with food; reduce dose
Tip: Reduce dose
Tip: Use only products certified free of pyrrolizidine alkaloids
Both are GLA-rich oils evaluated together in the same Cochrane reviews; borage is more GLA-concentrated. They serve the same mechanism, so they are alternatives rather than additive.
Same GLA pathway — choose one; stacking adds little beyond total GLA dose.
Omega-3 EPA/DHA and omega-6 GLA act on different but related eicosanoid pathways; some inflammatory-condition protocols combine them.
Broader fatty-acid balance for inflammatory support, though evidence for the combination is limited.
The best time to take Borage Oil is with meals. Take it with food. Taking with food aids absorption of the oil and reduces GI upset; effects build over months.
Borage Oil is generally safe at recommended doses, with a few precautions worth noting. The most commonly reported side effects are mild GI upset (soft stools, nausea, belching), headache, liver toxicity from pyrrolizidine alkaloids (non-PA-free products). Use caution if any of these apply to you: Pregnancy (GLA/prostaglandin effects; possible labor-inducing concern); Seizure disorders or use of seizure-threshold-lowering drugs (theoretical); Liver disease (pyrrolizidine alkaloid concern with non-PA-free products).
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