Omega-6 (Borage Oil/GLA) and Cyclic Breast Pain: What a 91-Patient Trial Found

Borago officinalis (borage) seeds are one of the richest natural sources of gamma-linolenic acid (GLA) — the first product in the omega-6 fatty acid pathway, and a compound with a specific, well-studied clinical application: cyclic mastalgia, the cyclical breast tenderness and pain that affects up to a third of women of reproductive age and is one of the most common reasons for a visit to a general practitioner.

Why GLA, Specifically

Cyclic mastalgia is linked to hormonal fluctuation across the menstrual cycle — particularly estrogen’s effect on breast tissue proliferation. GLA is converted in the body from linoleic acid (LA), and reduced conversion efficiency has been associated with a range of conditions including PMS, rheumatoid arthritis, and diabetes. Clinical studies have found that supplementing GLA directly — bypassing the conversion step the body would otherwise need to perform — can effectively address some of these symptoms.

How the Trial Was Run

91 women with a clinical diagnosis of cyclic mastalgia (breast pain occurring within two weeks of menstruation, relieved by the onset of the period, present for at least 2 months with meaningful intensity) took 900 mg/day of borage oil, standardized to at least 180 mg GLA per capsule, for 90 days. Pain was measured using a validated 100mm visual analog scale, both for mean mastalgia severity and most-severe episodes, alongside the impact of mastalgia on work, sleep, and sexual activity.

What Improved

Pain Scores

Both mean mastalgia severity and most-severe mastalgia showed statistically significant reductions (p < 0.0001) from baseline to the end of treatment. Mean mastalgia scores improved in 92.3% of treated patients, and most-severe mastalgia scores improved in 93.4% — a large majority, not a marginal subset.

Quality of Life

Beyond the pain scale itself, there were statistically significant improvements in how mastalgia affected work (p < 0.0001), sleep (p = 0.0006), and sexual activity (p = 0.0029) over the treatment period — a genuinely broad functional improvement, not just a reduction in a pain number.

Safety

Tolerability was rated good overall. Adverse events did occur — mostly mild-to-moderate gastrointestinal symptoms like nausea, bloating, and gas — but no serious side effects were reported, and all recorded events were transient. Both patients and the treating physician rated overall improvement highly, with a statistically significant improvement (p < 0.0001) in both assessments by the end of the study.

The Bottom Line

In this 91-patient, 90-day clinical trial, borage oil — a concentrated omega-6 GLA source — produced a large, statistically robust improvement in cyclic mastalgia pain and its impact on daily functioning, with good tolerability and no serious safety concerns. This is a specific, well-defined clinical use case rather than a general “omega-6 is good for you” claim, and the trial design (validated pain scale, defined dose, defined population) gives it more weight than typical supplement marketing evidence.

References
[1] Gama, C.R.B.; Lasmar, R.; Gama, G.F.; Oliveira, L.; Naliato, E.C.O.; Ribeiro, M.G.; Paoli, F.; Fonseca, A.S.; Abreu, C.S.; Geller, M.; Santos, A. “Clinical Assessment of Treatment Outcomes Following Borago officinalis Extract Therapy in Patients Presenting with Cyclical Mastalgia.” Int. J. Clin. Med. 2015, 6, 363–371. https://doi.org/10.4236/ijcm.2015.66047 (open access)