Sea Buckthorn (Hippophae rhamnoides)

Oral and topical sea buckthorn oil supply omega-7, omega-3/6 and vitamin E that support the skin's lipid barrier and reduce transepidermal water loss. Small human trials show improved skin elasticity, hydration and reduced atopic dermatitis symptoms. Evidence is promising but limited to small studies.

Sea buckthorn oil is one of the better-studied natural options for dry eye and vaginal atrophy. A randomised, placebo-controlled trial in Finland found 2 g/day of sea buckthorn oil for 3 months attenuated the rise in tear film osmolarity and reduced dry eye symptoms; another trial showed improved vaginal epithelial integrity in postmenopausal women. Evidence is moderate for dry eye, preliminary for vaginal dryness.

The berries contain exceptionally high vitamin C (up to 10–15× that of oranges by weight), plus flavonoids (quercetin, isorhamnetin, kaempferol) and carotenoids. Human studies show reduced markers of oxidative stress and inflammation such as CRP after supplementation. Evidence for biomarker changes is reasonable; clinical outcome data are thinner.

Flavonoid-rich sea buckthorn extracts have been shown to reduce platelet aggregation, modestly lower LDL and improve HDL in some trials, and palmitoleic acid (omega-7) is linked to improved insulin sensitivity in observational work. Results across trials are inconsistent and effect sizes are small. Evidence is mixed/preliminary.

Traditionally used for gastric ulcers and reflux; animal studies and small human data suggest sea buckthorn oil promotes healing of gastric mucosa and reduces ulcer size, likely via its carotenoids, vitamin E and fatty acid profile. Human evidence is limited and mostly from Eastern European and Chinese research.

Take with your largest meal of the day, or split morning and evening if using 2 g or more. Consistency matters more than exact timing — benefits for skin, eye and mucosal dryness typically require 8–12 weeks of daily use.

Take with food containing some fat. The active constituents — omega-7, omega-3/6, vitamin E, carotenoids and tocotrienols — are all fat-soluble, so absorption is substantially better with a meal than on an empty stomach. Juice or berry powder forms are less dependent on fat but still better tolerated with food.

Oil: 1–3 g/day (roughly 1,000–3,000 mg, often 2–4 capsules) is the range used in clinical trials; 2 g/day for 3 months was used in the dry eye and vaginal atrophy studies. Juice: 30–90 mL/day. Berry powder: 1–3 g/day. Berry (pulp) oil is higher in omega-7; seed oil is higher in omega-3/6 — many products blend both, which is a reasonable default.

Softgel capsules of CO2-extracted or cold-pressed oil are the most practical and best-studied form. Look for products specifying omega-7 (palmitoleic acid) content and whether the oil is from berry pulp, seed, or both. Pure juice and freeze-dried berry powder retain more vitamin C and flavonoids but less oil; topical oil can be used alongside oral for skin complaints.

May have mild antiplatelet effects — use caution with warfarin, DOACs, aspirin or clopidogrel, and stop 1–2 weeks before surgery. May modestly lower blood pressure and blood glucose, so monitor if on antihypertensives or diabetes medication. Avoid if allergic to Elaeagnaceae plants; high doses can cause loose stools or mild reflux. Safety in pregnancy and breastfeeding is not established at supple

The strongest human evidence for sea buckthorn: oral oil at ~2 g/day for 3 months reduced redness and burning and limited tear osmolarity increases in a randomised controlled trial. It may be a useful adjunct to artificial tears, especially in dry winter climates or for contact lens wearers.

Oral seed oil and topical berry oil have reduced itching and improved skin barrier function in small trials and case series, likely via omega-3/6 balance and vitamin E. It is best viewed as supportive care alongside emollients, not a replacement for prescribed treatment.

A double-blind trial in postmenopausal women found 3 months of oral sea buckthorn oil improved vaginal epithelium integrity versus placebo. It is a non-hormonal option worth trying for women who cannot or prefer not to use topical estrogen, though effect sizes are modest.

Berry and juice supplementation has produced small reductions in CRP, modest LDL improvements and better glucose handling in some trials, plausibly via omega-7 and flavonoids. Evidence is inconsistent — it should complement, not replace, diet, exercise and statin therapy where indicated.

Animal and limited human data suggest the oil accelerates mucosal healing and reduces ulcer indices, possibly by increasing prostaglandin-mediated protection. Evidence is weak by Western standards; it does not treat H. pylori and should not delay standard therapy.

Sea buckthorn supplies omega-7 and plant omega-3 (ALA) but little EPA/DHA, which are the forms with the strongest dry-eye and anti-inflammatory evidence. Combining them covers a broader fatty acid spectrum and the pairing is commonly used in dry eye protocols. View Omega-3 (fish or algal oil, EPA/DHA) guide →

Vitamin E protects the polyunsaturated fats in sea buckthorn oil from peroxidation and works synergistically in the skin lipid barrier. Sea buckthorn is itself tocopherol-rich, so modest additional doses are sufficient. View Vitamin E (mixed tocopherols) guide →

Hyaluronic acid draws and holds water in the dermis and on the ocular surface, while sea buckthorn's lipids reduce water loss — a complementary 'water plus oil' approach. Oral HA has small-trial support for skin hydration and dry eye. View Hyaluronic acid guide →

Collagen provides the structural amino acids and signalling peptides for dermal matrix synthesis, while sea buckthorn supports the lipid barrier and supplies vitamin C needed as a cofactor for collagen cross-linking. The combination is popular for skin elasticity, with each component having its own modest evidence base. View Collagen peptides guide →

Both are lipid-soluble antioxidants that concentrate in skin and eye tissue, protecting membranes and reducing UV-induced oxidative damage. Taking them together with sea buckthorn's own fats improves absorption of all carotenoids. View Astaxanthin or mixed carotenoids guide →

Like pharmacological dry eye treatments, sea buckthorn oil improves tear film stability and reduces ocular surface inflammation — but systemically, via fatty acid incorporation into meibomian lipids rather than T-cell inhibition. Supported by one good randomised controlled trial, so the comparison is mechanistically plausible but the effect is weaker than prescription therapy.

Sea buckthorn oil improved vaginal epithelial integrity in postmenopausal women in a placebo-controlled trial, overlapping with the mucosal-restoring effect of local estrogen — but without hormonal receptor activity. Evidence is preliminary and the magnitude is far smaller than estrogen therapy.

Sea buckthorn flavonoid extracts have reduced ADP-induced platelet aggregation in human volunteers, a mechanism qualitatively similar to aspirin's antiplatelet action though not via COX-1 inhibition. The effect is modest and clinically unproven, but relevant enough to matter for bleeding-risk interactions.

Animal and limited human ulcer studies suggest sea buckthorn oil promotes gastric mucosal healing and protection, conceptually similar to cytoprotective agents like sucralfate or misoprostol. Evidence is weak and largely preclinical, so this should be considered a hypothesis rather than an established parallel.