Cold-Pressed Borage Seed Oil (Borago officinalis)

Cold-pressed borage seed oil is the richest plant-derived source of gamma-linolenic acid (GLA), comprising 18–24% of its fatty acid profile. GLA serves as a direct precursor to dihomo-gamma-linolenic acid (DGLA), which competes with arachidonic acid in eicosanoid synthesis pathways to support inflammatory balance.

Origin & History

Cold-Pressed Borage Seed Oil is derived from the seeds of Borago officinalis L., a flowering herb native to the Mediterranean region also known as starflower. The oil is extracted through cold-pressing without solvents or heat, followed by optional refining, which preserves its natural composition including 18-24% gamma-linolenic acid (GLA).

Historical & Cultural Context

No historical or traditional medicine uses are documented in the provided research sources. Traditional applications of borage oil are not described in the available data.

Health Benefits

• Rich source of gamma-linolenic acid (18-24%) - though no clinical studies provided
• Contains antioxidant properties demonstrated in vitro (EC50 132-182 mg/mg DPPH) - preliminary evidence only
• High in essential fatty acids including linoleic acid (34-42%) - compositional data only
• Meets USP-NF pharmaceutical purity standards - quality specification, not health benefit
• Note: No human clinical trials or health outcomes data available in current research

How It Works

GLA in borage seed oil is elongated by delta-6-desaturase to DGLA, which accumulates in cell membranes and competes with arachidonic acid for cyclooxygenase (COX) and lipoxygenase (LOX) enzyme activity, shifting eicosanoid production toward less pro-inflammatory prostaglandin E1 (PGE1) and away from prostaglandin E2 (PGE2). The oil's linoleic acid (34–42%) also serves as a substrate for the delta-6-desaturase pathway, contributing to overall n-6 polyunsaturated fatty acid homeostasis. In vitro antioxidant assays record an EC50 of 132–182 mg/mg DPPH, suggesting tocopherol and phenolic constituents may scavenge free radicals, though the specific active fractions have not been fully isolated.

Scientific Research

No human clinical trials, randomized controlled trials, or meta-analyses were found in the available research. The evidence is limited to compositional analysis and in vitro antioxidant studies, with no PubMed PMIDs provided for clinical research.

Clinical Summary

No published randomized controlled trials have evaluated cold-pressed borage seed oil specifically as an isolated intervention; existing evidence is primarily compositional or in vitro in nature. Some clinical research on GLA-containing oils broadly suggests potential benefit in atopic dermatitis and rheumatoid arthritis, but these studies used mixed GLA sources and varied dosages (typically 1.4–2.8 g GLA/day), making direct extrapolation to this product unreliable. The oil's compliance with USP-NF standards confirms purity and composition consistency, but does not constitute clinical efficacy evidence. Overall, the evidence base is preliminary and larger, well-controlled human trials are needed before therapeutic claims can be substantiated.

Nutritional Profile

Cold-pressed borage seed oil is a lipid-rich oil (~99% fat) with a distinctive fatty acid profile. The dominant bioactive compound is gamma-linolenic acid (GLA, C18:3 n-6), present at approximately 18–26% of total fatty acids, making it one of the richest botanical sources of GLA available. Linoleic acid (LA, C18:2 n-6) constitutes approximately 34–42% of total fatty acids, followed by oleic acid (C18:1 n-9) at approximately 15–20%, palmitic acid (C16:0) at approximately 9–12%, stearic acid (C18:0) at approximately 3–5%, and erucic acid (C22:1 n-9) at approximately 2–4%. Minor fatty acids include eicosenoic acid (C20:1) at ~3–5% and nervonic acid (C24:1) at trace to ~2%. The caloric density is approximately 884 kcal per 100 mL (typical of pure plant oils). The oil contains fat-soluble minor constituents including tocopherols (primarily gamma-tocopherol at approximately 30–60 mg/100g and delta-tocopherol at approximately 5–15 mg/100g, with minimal alpha-tocopherol), which contribute to both antioxidant activity and oxidative stability. Phytosterols are present at approximately 200–400 mg/100g total, including beta-sitosterol (~50–60% of sterol fraction), campesterol (~15–25%), and delta-5-avenasterol (~10–15%). Polyphenolic compounds are present in trace amounts in cold-pressed versions (contributing to the reported in vitro DPPH radical scavenging activity, EC50 132–182 mg/mg DPPH). Phospholipids may be present at low levels (~0.5–1.5%) in unrefined cold-pressed oil. The oil contains no significant protein, carbohydrates, fiber, or water-soluble vitamins. Mineral content is negligible. Regarding bioavailability: GLA from borage oil triglycerides is well-absorbed in the gastrointestinal tract (estimated >90% absorption when consumed with a meal containing dietary fat), and is subsequently converted via elongation to dihomo-gamma-linolenic acid (DGLA, C20:3 n-6), a precursor to anti-inflammatory series-1 prostaglandins. GLA bioavailability from borage oil is considered comparable to or slightly superior to that from evening primrose oil due to higher GLA concentration per unit dose. Cold-pressing preserves heat-sensitive tocopherols and minor bioactives that may be degraded during solvent extraction or refining. The oil is highly susceptible to oxidative degradation due to its high polyunsaturated fatty acid content (iodine value ~140–155), necessitating storage under nitrogen, in dark glass, and at cool temperatures to preserve nutritional integrity.

Preparation & Dosage

No clinically studied dosage ranges are available as human trials are absent from the research. The oil typically contains 18-24% GLA according to USP-NF specifications, but therapeutic dosing has not been established. Consult a healthcare provider before starting any new supplement.

Synergy & Pairings

Evening primrose oil, black currant seed oil, fish oil, vitamin E, zinc

Safety & Interactions

Borage seed oil contains pyrrolizidine alkaloids (PAs) in trace amounts depending on extraction method; cold-pressing may retain low levels, and long-term or high-dose use warrants caution due to potential hepatotoxicity associated with unsaturated PAs. It may potentiate the effects of anticoagulant and antiplatelet drugs such as warfarin and aspirin by modestly inhibiting thromboxane A2 synthesis via the DGLA pathway, increasing bleeding risk. Borage seed oil is contraindicated during pregnancy due to potential uterotonic effects of PGE1 precursors and uncertain PA exposure levels. Individuals with epilepsy should consult a physician before use, as GLA-rich oils have been associated with lowered seizure threshold in isolated case reports.