What It Is
Sea buckthorn (Hippophae rhamnoides) is a thorny shrub native to Europe and Asia that produces small, bright-orange berries packed with nutrients. It has a long history in traditional medicine across Tibet, Mongolia, Russia, and China, where both the berries and the oils pressed from them were used for skin, digestion, and general resilience.
What makes sea buckthorn unusual is its fatty-acid profile. Two distinct oils come from the plant: seed oil, which is rich in omega-3 (alpha-linolenic acid) and omega-6 (linoleic acid) in a near-balanced ratio, and pulp/berry oil, which is one of the richest known sources of omega-7 (palmitoleic acid) — a monounsaturated fat that’s scarce in most diets. The berries also carry vitamin C, vitamin E (tocopherols and tocotrienols), carotenoids (beta-carotene, zeaxanthin, lycopene), flavonoids, and plant sterols. This combination is why it’s often classed as an antioxidant and “skin-and-membrane” supplement rather than a single-mechanism compound.
Benefits
Skin and mucous-membrane hydration. Sea buckthorn’s signature use is countering dryness. Omega-7 is a structural component of skin and mucosal cells, and supplementing it appears to support the lipid layer that holds moisture in. Studies suggest the oil may improve skin elasticity and reduce transepidermal water loss, and it has been studied for dry, irritated mucous membranes (mouth, gut, and urogenital). Results typically build over 4 to 12 weeks of daily use.
Dry eye relief. A small number of placebo-controlled trials of oral sea buckthorn oil in people with dry-eye symptoms have reported modest improvements, such as reduced redness or burning, though the evidence base is limited and findings are not consistent across all outcomes. The proposed mechanism involves the omega fatty acids and support of the meibomian (oil) glands that help stabilize the tear film. At best it’s an adjunct to — not a replacement for — artificial tears or prescribed dry-eye treatment, and you should see an eye doctor for persistent dry-eye symptoms.
Metabolic and cardiovascular support. Smaller human studies and animal data suggest sea buckthorn may modestly improve markers such as triglycerides, LDL cholesterol, and post-meal blood sugar, possibly via palmitoleic acid’s effects on insulin signaling and the berry’s flavonoids. Evidence here is preliminary and should not be read as a reason to adjust any prescribed medication.
Antioxidant protection. The dense mix of vitamin C, vitamin E, carotenoids, and flavonoids helps neutralize free radicals, which underpins many of the skin and vascular benefits above.
How to Take (Dosage)
A common, evidence-aligned range is 1-3 g of sea buckthorn oil per day, which is what most softgel products are dosed around. A typical regimen is 2 g daily, often split into two doses.
- Take it with a meal that contains some fat — the active fatty acids and carotenoids are fat-soluble and absorb far better with food.
- Be patient: dryness, skin, and eye benefits usually take 4-12 weeks to become noticeable.
- If using berry juice or powder instead of oil, follow the label; these are more variable in omega-7 content than concentrated oil.
Best Forms
Look for a CO2-extracted whole-berry oil that combines both the seed and pulp fractions — this preserves the full spectrum of omega-7, omega-3/6, and heat-sensitive carotenoids without solvent residue. Softgels protect the oil from oxidation and make dosing consistent.
- Pulp/berry oil is highest in omega-7; seed oil is higher in omega-3/6. A blend gives the broadest profile.
- A deep orange-red color signals intact carotenoids.
- Choose products with third-party testing and store away from heat and light, since these oils oxidize over time.
Safety & Side Effects
Sea buckthorn is generally well tolerated. Side effects are usually mild and digestive — loose stools or stomach upset, most often at the higher end of the dose range. Because it can mildly thin the blood and lower blood pressure, the main cautions are around bleeding and circulation.
Who should be cautious or avoid it:
- Pregnant or breastfeeding women — there isn’t enough safety data, so avoid it.
- People with bleeding disorders or anyone scheduled for surgery (stop at least 2 weeks beforehand).
- People on blood-pressure medication or with low blood pressure — monitor for dizziness.
This is a supplement, not a treatment for any diagnosed condition. If you have a medical issue, talk to your doctor before starting.
Drug Interactions
- Anticoagulants / antiplatelets (warfarin, clopidogrel, aspirin) and other blood-thinning supplements: sea buckthorn may add to their effect and raise bleeding risk.
- Blood-pressure medications: its mild hypotensive effect may compound theirs.
- Blood-sugar-lowering drugs: a theoretical additive effect means diabetics should monitor glucose.
Pairing it with omega-3 fish oil amplifies the overall fatty-acid benefit but also the blood-thinning effect, so be mindful if you’re on any of the drugs above. Antioxidant partners like vitamin E, vitamin C, and astaxanthin complement its skin and eye support without the same interaction concerns. As always, run combinations past your doctor or pharmacist.
Bottom Line
Sea buckthorn earns its reputation as a dryness-and-skin supplement: its rare omega-7 content plus a built-in antioxidant package makes 1-3 g of whole-berry oil daily a reasonable, well-tolerated choice for dry skin, dry eyes, and dry mucous membranes, with promising but earlier-stage support for metabolic markers. It’s well tolerated by most people, but the key caveats matter — skip it in pregnancy and breastfeeding, and check with your doctor or pharmacist first if you take blood thinners or blood-pressure medication or have a bleeding disorder. Treat it as an adjunct to good skincare, hydration, and any prescribed care, not a replacement for them.