How much GLA is in borage seed oil compared to evening primrose oil?

Borage seed oil contains approximately 18–26% gamma-linolenic acid (GLA) by weight, making it the richest known plant-based GLA source. Evening primrose oil contains only 8–10% GLA, meaning borage oil delivers roughly 2–3 times more GLA per gram of oil. A 1000 mg borage oil softgel typically provides 200–260 mg of GLA.

Does borage seed oil help with eczema or atopic dermatitis?

Clinical evidence is mixed: some RCTs report significant improvement in SCORAD scores and skin barrier markers (transepidermal water loss) in patients with atopic dermatitis who had elevated DGLA levels at baseline, while other trials showed no significant benefit over placebo. Typical study doses range from 500 mg to 2 g/day of borage oil. Benefit appears most likely in individuals with impaired delta-6-desaturase activity, who cannot efficiently convert dietary linoleic acid to GLA themselves.

Are there risks of liver damage from taking borage oil supplements?

Raw or unrefined borage preparations can contain unsaturated pyrrolizidine alkaloids (UPAs), which are documented hepatotoxins and potential carcinogens that can cause veno-occlusive liver disease with chronic exposure. Commercially produced borage seed oil supplements are typically solvent-extracted and refined to remove UPAs, and reputable products will be certified 'PA-free.' Always verify that any borage oil supplement explicitly states it is free of hepatotoxic pyrrolizidine alkaloids before use.

Can borage seed oil interact with blood thinners like warfarin?

Yes, borage seed oil may enhance the anticoagulant and antiplatelet effects of medications such as warfarin, aspirin, and clopidogrel, because DGLA derived from GLA stimulates synthesis of prostaglandin E1 (PGE1), which inhibits platelet aggregation. This additive effect could increase bleeding risk, particularly at doses above 1 g/day. Patients on anticoagulant therapy should consult a physician before supplementing and may require more frequent INR monitoring.

What is the recommended dosage of borage seed oil for skin health?

Clinical trials for skin conditions such as atopic dermatitis have used borage seed oil doses ranging from 500 mg to 3000 mg per day, often standardized to deliver 180–720 mg of GLA daily. Most studies showing positive outcomes used doses providing at least 200 mg of GLA per day, typically taken in divided doses with meals to improve absorption. No universally established therapeutic dose exists, and the optimal amount may vary based on individual GLA metabolism capacity.

Is borage seed oil safe to take during pregnancy and breastfeeding?

Borage seed oil is generally not recommended during pregnancy due to limited safety data and theoretical uterotonic effects, though evidence is limited. Most clinical trials have excluded pregnant and breastfeeding women, so insufficient evidence exists to confirm safety in these populations. Consult with a healthcare provider before use if you are pregnant, planning pregnancy, or breastfeeding.

Which form of borage seed oil is most bioavailable—standardized extract, whole oil, or GLA-enriched versions?

Standardized borage seed oil extracts (typically standardized to 20-24% GLA) offer more consistent bioavailability and dosing compared to whole oil, which varies in GLA content by batch. GLA-enriched versions concentrate the active compound, potentially requiring lower volumes for equivalent intake, though absorption is similar across all forms when taken with fat. The choice between forms depends on dosing convenience and individual tolerance rather than significant bioavailability differences.

What does the research show about borage seed oil for melasma and other pigmentation disorders?

A single RCT demonstrated significant melasma reduction after 6-8 weeks of topical borage seed oil application, suggesting potential for hyperpigmentation disorders. However, this evidence is limited to one study with a small sample size, and further research is needed to confirm efficacy and establish optimal treatment protocols. The mechanism may relate to borage oil's anti-inflammatory properties and effects on melanocyte function, though this requires additional clinical validation.

Borage Seed Oil (Borago officinalis)

Borage seed oil is extracted from Borago officinalis seeds and is the richest botanical source of gamma-linolenic acid (GLA), comprising 18–26% of its fatty acid profile. GLA is elongated to dihomo-gamma-linolenic acid (DGLA) in the body, which competes with arachidonic acid at cyclooxygenase enzymes to reduce pro-inflammatory eicosanoid synthesis.

Category: Seed Oils Evidence: 2/10 Tier: Moderate

Borage Seed Oil (Borago officinalis) — Hermetica Encyclopedia

Origin & History

Borage seed oil is extracted from the seeds of Borago officinalis L., a flowering plant native to the Mediterranean region. The oil is obtained through cold pressing or supercritical CO₂ extraction methods and is characterized by high concentrations of gamma-linolenic acid (GLA), linoleic acid, and oleic acid.

Historical & Cultural Context

The research dossier does not contain information about traditional or historical use of borage seed oil in traditional medicine systems.

Health Benefits

• May support skin health in atopic dermatitis - mixed evidence from RCTs showing improvement in subgroups with elevated DGLA levels
• Demonstrates anti-proliferative effects against leukemia cells (HL-60) with IC₅₀ values of 0.3-2.3 μL/mL in laboratory studies
• Shows potential for reducing skin pigmentation - one RCT found significant melasma reduction after 6-8 weeks of topical use
• Exhibits antimutagenic effects and DNA protective activity in laboratory studies
• May improve metabolic health when combined with quercetin - one study showed improved glucose tolerance and insulin resistance

How It Works

GLA from borage seed oil is converted by delta-6-desaturase and elongase enzymes into DGLA, which competes with arachidonic acid for COX-1 and COX-2 enzyme binding, shifting eicosanoid production toward less inflammatory series-1 prostaglandins (PGE1) and away from pro-inflammatory series-2 prostaglandins (PGE2) and leukotriene B4. DGLA also partially inhibits 5-lipoxygenase, reducing leukotriene synthesis. In vitro, borage oil's GLA content induces apoptosis in HL-60 leukemia cells with IC₅₀ values of 0.3–2.3 μL/mL, potentially via lipid peroxidation and mitochondrial membrane disruption.

Scientific Research

Clinical evidence includes a large RCT (n=140) showing no significant difference between borage oil and placebo for atopic dermatitis overall, though a subgroup with elevated DGLA levels showed improvement. A smaller trial (n=21) demonstrated significant melasma reduction with 1% lipase-treated borage oil cream after 6-8 weeks. A systematic review identified 12 controlled trials for atopic dermatitis applications.

Clinical Summary

Randomized controlled trials examining borage seed oil for atopic dermatitis have produced mixed results; a subset of trials report statistically significant improvements in SCORAD indices and transepidermal water loss in participants with elevated baseline DGLA levels, suggesting a pharmacogenomic responder subgroup. A double-blind RCT using 500 mg/day borage oil in adults with mild-to-moderate atopic dermatitis showed modest but not universally significant reductions in symptom scores compared to placebo. Anti-proliferative effects against HL-60 leukemia cells (IC₅₀ 0.3–2.3 μL/mL) are well-documented in vitro but have not been replicated in human clinical trials. Overall, the evidence base is preliminary to moderate; large, well-powered RCTs are lacking across most proposed indications.

Nutritional Profile

Borage Seed Oil is composed predominantly of fatty acids (~95-99% of total composition). The defining characteristic is its exceptionally high gamma-linolenic acid (GLA) content at 18-26% of total fatty acids — the richest plant-derived source of GLA available commercially. Full fatty acid breakdown: linoleic acid (omega-6) 35-38%, GLA (omega-6, 18:3n-6) 18-26%, oleic acid (omega-9) 14-20%, palmitic acid (saturated) 9-12%, stearic acid (saturated) 3-5%, eicosenoic acid (omega-9, 20:1) 3-5%, erucic acid (omega-9, 22:1) 1.5-3.5%, nervonic acid (24:1) ~1-2%, alpha-linolenic acid (omega-3) <0.5%. Minor bioactive components include tocopherols (primarily gamma-tocopherol and alpha-tocopherol) at approximately 50-100 mg/100g total, providing antioxidant stability. Phytosterols are present at approximately 200-400 mg/100g, predominantly beta-sitosterol (~60%), campesterol (~20%), and stigmasterol (~15%). Pyrrolizidine alkaloids (PAs) — specifically thesinine and other unsaturated PAs — are detectable in trace amounts (~1-10 ppm) in unrefined oils; pharmaceutical and cosmetic grades are typically processed to reduce PA content below regulatory thresholds (European Medicines Agency guidance: <1 μg/day PA intake). Caloric density is approximately 884 kcal/100g (standard for refined plant oils). GLA bioavailability: orally consumed GLA from borage oil is efficiently converted to dihomo-gamma-linolenic acid (DGLA) in tissues, with conversion rates depending on individual delta-6-desaturase enzyme activity; topical bioavailability is limited but measurable via transdermal absorption studies. No meaningful protein, carbohydrate, fiber, or water-soluble vitamin content is present in the refined oil form.

Preparation & Dosage

Clinical trials have used oral borage oil supplementation over 12-week periods for atopic dermatitis, though specific dosages were not reported in available research. For topical skin brightening, 1% lipase-treated borage oil in cream formulations was studied. Consult a healthcare provider before starting any new supplement.

Synergy & Pairings

Quercetin, Evening primrose oil, Fish oil, Vitamin E, Black currant seed oil

Safety & Interactions

Borage seed oil is generally well tolerated at typical supplemental doses of 500–3000 mg/day, with mild gastrointestinal upset (nausea, soft stools) being the most commonly reported adverse effect. Unsaturated pyrrolizidine alkaloids (UPAs) present in non-refined borage preparations carry hepatotoxic and potentially carcinogenic risk; supplements should specify 'PA-free' or hepatotoxic-alkaloid-free certification. Borage oil may potentiate anticoagulant and antiplatelet medications (e.g., warfarin, aspirin, clopidogrel) due to PGE1-mediated platelet aggregation inhibition, warranting clinical monitoring. Use is contraindicated in pregnancy due to potential uterotonic prostaglandin effects, and safety in lactation has not been established.