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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 high-quality meta-analyses and randomised trials published 1989–2021 with a typical study size of 1,596 participants.
Based on 19 studies · 1 meta-analysis · 16 RCTs · 1,625 total participants
Confidence
High confidenceBy outcome
Scores low-moderate/Emerging because Cochrane reviews give only moderate evidence of modest GLA benefit for rheumatoid arthritis but a clear negative verdict for eczema, with skin-barrier support resting on one small uncontrolled trial.
22 rigorous studies
20 randomized trials · 2 meta-analyses · 0 systematic reviews
Our evidence rating for Borage Oil is accountable to this entire body of rigorous research indexed in PubMed — not a hand-picked subset.
PubMed · as of Jul 2026
No trials currently enrolling · 12 completed on ClinicalTrials.gov
5 of the completed trials have posted results
Registered trials show research momentum for Borage Oil, not proof of effect — a registration is a plan, and posted results are sponsor-reported, not peer-reviewed. They are never counted toward the evidence rating above.
Browse these trials on ClinicalTrials.govClinicalTrials.gov · as of Sep 2026
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.
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
Borage Oil has an evidence score of 3.5/10 — emerging evidence based on 18 indexed studies, including 1 meta-analysis. 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 200-720mg GLA; RA trials used a higher ~1.4g GLA dose (~6g oil). Individual needs vary — start at the lower end of the range and adjust based on how you respond.
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).
Omega-3
Probably helpsEssential fatty acids critical for brain health, mood regulation, and reducing inflammation throughout the body.
Collagen
Likely helpsHydrolyzed peptides that rebuild skin elasticity, reduce joint pain, and strengthen bone density — results build over 8-12 weeks.
Hyaluronic Acid
Mostly mechanism / observationalHolds 1,000x its weight in water. Most strong evidence is for injectable/intra-articular HA in knee osteoarthritis; oral supplementation shows small, inconsistent benefits for skin and joints.
Black Seed Oil
Likely helpsThymoquinone-rich oil studied for immune modulation, blood sugar control, and anti-inflammatory effects across numerous trials.
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Reviewed by Dr. Baher Al Hakim · Last reviewed June 2026 · evidence from 19 studies · how we score · editorial policy
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.
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