Sea buckthorn is a nutrient-dense berry with a surprisingly broad range of health benefits, from easing dry eyes to improving cholesterol levels. The small orange fruit packs 131 mg of vitamin C per 100 grams (more than most citrus fruits), along with a rare combination of omega-3, 6, 7, and 9 fatty acids that few other plant foods can match. Both the berries and their extracted oils have been studied in clinical trials for heart health, skin conditions, eye comfort, blood sugar regulation, and stomach protection.
A Rare Nutritional Profile
What makes sea buckthorn unusual is its fatty acid diversity. Most plant oils contain omega-3 and omega-6 fats, but sea buckthorn also delivers meaningful amounts of omega-7 (palmitoleic acid) and omega-9 (oleic acid). Per 100 grams of raw berries, you get roughly 1 gram of omega-7, 1 gram of omega-9, 0.6 grams of omega-6, and 0.3 grams of omega-3. Omega-7 in particular is hard to find in foods and has drawn interest for its effects on metabolism and inflammation.
Beyond the fats, raw sea buckthorn berries provide 3.1 mg of vitamin E per 100 grams and that hefty dose of vitamin C. The berries also contain carotenoids, flavonoids, and other plant compounds with antioxidant activity. This combination of fat-soluble and water-soluble nutrients is part of why sea buckthorn shows up in research on so many different conditions.
Cholesterol and Heart Health
The strongest human evidence for sea buckthorn involves blood lipids. A meta-analysis of 11 randomized controlled trials found that sea buckthorn berries or extracts significantly lowered total cholesterol, triglycerides, and LDL (“bad”) cholesterol in people with existing cardiovascular risk factors. LDL dropped by an average of 0.62 mmol/L, total cholesterol fell by 0.63 mmol/L, and triglycerides decreased by 0.46 mmol/L. HDL (“good”) cholesterol rose by 0.27 mmol/L.
The important caveat: these improvements appeared in people who already had cardiovascular risk factors. Healthy subjects in the same analysis didn’t see the same shifts. Clinical trials used doses equivalent to about 100 grams of fresh berries daily, or concentrated oil supplements, typically over several weeks. If your cholesterol is already in a healthy range, sea buckthorn likely won’t change your numbers much.
Dry Eye Relief
A double-blind, randomized trial published in The Journal of Nutrition tested 2 grams of sea buckthorn oil daily (taken as 1 gram twice a day) over three months during fall and winter, when dry eye symptoms tend to worsen. Participants who took the oil experienced less increase in tear film osmolarity compared to placebo, meaning their tears stayed more stable and less concentrated. The oil also reduced the maximum intensity of redness and burning sensations.
Cold, dry air is a common trigger for eye discomfort, and the omega fatty acids in sea buckthorn oil appear to support the mucous membranes that keep your eyes lubricated. This makes it a practical option for people who struggle with seasonal dryness or spend long hours in air-conditioned environments.
Blood Sugar and Insulin Sensitivity
Animal and cell studies suggest sea buckthorn fruit oil can improve how the body handles glucose. In research on insulin-resistant liver cells, sea buckthorn oil extract increased glucose uptake from 12.23 to 14.90 mmol/L, meaning cells became better at pulling sugar out of the bloodstream. In diabetic rats, insulin sensitivity indices improved after four weeks of treatment at 300 mg per kilogram of body weight per day.
The mechanism appears to involve a signaling pathway that promotes glycogen synthesis, essentially helping cells store glucose more efficiently rather than leaving it circulating in the blood. While these results haven’t been confirmed in large human trials yet, the omega-7 content of sea buckthorn is thought to play a key role, since palmitoleic acid has been independently linked to metabolic benefits in other research.
Stomach and Digestive Protection
Both sea buckthorn seed oil and pulp oil have shown protective effects against stomach ulcers in animal studies. Rats given either oil before ulcer-inducing stress showed significantly less ulcer formation, with inhibition rates ranging from 21% to 70% depending on the dose and type of ulcer model. The pulp oil was particularly effective against ulcers caused by excess stomach acid buildup, reducing damage by 22% to 44% in a dose-dependent pattern.
Beyond prevention, sea buckthorn oil also accelerated healing of existing ulcers. This dual action, both protective and restorative, suggests the oils help reinforce the stomach’s mucosal lining. These findings are from animal models, so the exact translation to human stomachs isn’t fully established, but the traditional use of sea buckthorn for digestive complaints aligns with what the lab data shows.
Skin and Mucosal Health
Sea buckthorn oil has been studied for atopic dermatitis (eczema) at doses of 5 grams per day of seed or pulp oil over four months. The fatty acid profile, particularly omega-7 and omega-6, supports the skin’s lipid barrier, which is often compromised in people with eczema or chronically dry skin. Postmenopausal women have also been studied at doses of 1.5 grams twice daily for three months to address vaginal dryness and other mucosal symptoms.
The omega-7 fatty acid is the ingredient most closely tied to mucosal health. Mucous membranes line your eyes, mouth, digestive tract, and urogenital areas, and palmitoleic acid is a natural component of these tissues. Supplementing with a concentrated source may help maintain moisture and integrity in these areas, especially during hormonal changes or in dry climates.
Typical Dosages in Research
Clinical trials have used a wide range of sea buckthorn preparations. Oil supplements typically fall between 2 and 5 grams per day. For dry eye, 2 grams daily for three months is the best-studied dose. For cardiovascular benefits, researchers have used either concentrated oil or air-dried berries equivalent to about 100 grams of fresh fruit daily. Freeze-dried berry preparations in trials have ranged from 5 to 45 grams. The specific dose depends on the form you’re taking and what you’re hoping to address.
Safety and Blood-Thinning Effects
Sea buckthorn is generally well tolerated at the doses used in clinical trials, but it has measurable anti-platelet activity that’s worth knowing about. Lab research has found that sea buckthorn seed extracts reduce platelet activation by 38% to 62%, depending on the concentration and stimulus. The extracts also inhibit platelet adhesion to fibrinogen and collagen by 20% to 30%, and they suppress an enzyme involved in clot formation. Notably, this anti-platelet effect persists even after the seeds are roasted or otherwise heat-processed.
If you take blood-thinning medications or are scheduled for surgery, this matters. The combined effect of sea buckthorn and anticoagulant drugs could increase bleeding risk. It’s also worth noting that sea buckthorn’s blood pressure-lowering properties could theoretically amplify the effects of antihypertensive medications. People on these types of medications should factor sea buckthorn’s pharmacological activity into the conversation with their prescriber.