{"url":"https://whatshealthyandwhy.com/sea-buckthorn/omega-7-skin-and-metabolic-health","path":"/sea-buckthorn/omega-7-skin-and-metabolic-health","alternates":{"json":"https://whatshealthyandwhy.com/api/articles/sea-buckthorn/omega-7-skin-and-metabolic-health.json","markdown":"https://whatshealthyandwhy.com/sea-buckthorn/omega-7-skin-and-metabolic-health.md"},"topic":{"slug":"sea-buckthorn","name":"Sea Buckthorn","url":"https://whatshealthyandwhy.com/sea-buckthorn"},"slug":"omega-7-skin-and-metabolic-health","order":1,"title":"Omega-7, Skin Health, and Metabolic Benefits","question":"Does sea buckthorn improve cholesterol, dry eyes and skin?","answer":"Sea buckthorn likely lowers triglycerides and LDL cholesterol in people with abnormal lipids; dry eye and eczema benefits rest on one trial each.","description":"How sea buckthorn's rare omega-7 fatty acid, exceptional vitamin C content, and dense antioxidant profile support skin health, improve blood lipids, reduce inflammation, and protect mucosal membranes — with evidence from multiple randomized controlled trials","confidence":3,"confidenceNote":"A 15-RCT meta-analysis shows lipid gains with high heterogeneity and no high-quality trial; dry eye (100 people) and eczema (49) each have one trial.","evidenceSummary":{"rctCount":4,"observationalCount":0,"metaAnalysisCount":1,"totalParticipants":"400+","replicated":true,"newestStudyYear":2022},"category":{"categoryTitle":"What's Good For You","categorySlug":"good-for-you","subcategoryName":"Foods & Drinks","subcategorySlug":"foods","url":"https://whatshealthyandwhy.com/explore/good-for-you/foods"},"actions":["Berry juice at 50–100 mL a day is a typical trial dose for blood fats; dilute it, since the berries are very tart.","For dry eye or skin, choose pulp oil, not seed oil; the trials used 2–3 g a day for 3–4 months [3][6].","Pair the puree with carbohydrate-containing foods; one 18-man trial cut the early insulin rise by 39.6%, but it needs replication [5]."],"cautions":["Lipid benefits were concentrated in people with abnormal baseline lipids; effects in people with healthy lipids were smaller and inconsistent [1].","In 254 healthy adults it did not reduce colds or stomach infections, so do not expect it to prevent them [2].","Pulp oil can turn stools orange at higher doses; this is harmless and reflects its carotenoids."],"simpleText":"Sea buckthorn (Hippophae rhamnoides) is a small orange berry found growing on thorny shrubs in mountain regions from the Himalayas to Siberia. It is extraordinary for its nutritional density: it contains up to 695 mg of vitamin C per 100 grams of fresh fruit — among the highest of any food — along with a rare fatty acid called omega-7 (palmitoleic acid) that most people get almost none of. [4] Clinical trials have found that sea buckthorn improves blood lipid profiles in people with elevated cholesterol, lowers markers of systemic inflammation, reduces dry eye symptoms, and can improve atopic dermatitis (eczema) when taken as an oil. [1][2][3][6] It is most often consumed as a juice, oil supplement, or berry powder, and its effects are gentle and cumulative rather than dramatic and fast.","mediumText":"How Sea Buckthorn Works\n\nSea buckthorn's health effects come from a uniquely dense combination of bioactive compounds: a very high vitamin C content, lipophilic antioxidants concentrated in the oil (carotenoids, tocopherols), polyphenols and flavonoids in the berries, and the rare omega-7 fatty acid palmitoleic acid — especially in the pulp oil.\n\nOmega-7: The Unusual Fatty Acid\n\nMost people consume plenty of omega-3, omega-6, and omega-9 fatty acids — but omega-7 (palmitoleic acid) barely appears in the typical diet. Sea buckthorn pulp oil is the richest plant source, with palmitoleic acid making up 17–32% of its fatty acid content depending on the subspecies. [4]\n\nPalmitoleic acid has a distinctive biological profile compared to other fatty acids:\n\n- It is a natural component of skin lipids and sebum, and dietary intake of palmitoleic acid supports the integrity of the skin barrier and mucosal epithelium\n- It has anti-inflammatory signaling properties distinct from those of omega-3 fatty acids, modulating inflammatory gene expression through lipokine pathways\n- It appears to support insulin sensitivity — epidemiological data consistently associates higher plasma palmitoleic acid with better glucose metabolism and lower metabolic disease risk\n\nThe mucosal epithelium finding is particularly well-supported. A randomized controlled trial of 100 adults taking 2 g/day of sea buckthorn oil for 3 months found that the oil significantly attenuated the seasonal rise in tear film osmolarity — a key marker of dry eye severity — compared to placebo. Symptoms of burning and redness were also reduced. [3] The mechanism: palmitoleic acid is incorporated into the meibomian gland lipids that stabilize the tear film, keeping the ocular surface hydrated. The same principle applies to other mucosal surfaces — the gut lining, airways, and urogenital tract — though the eye evidence is the most direct.\n\nSkin Health and Atopic Dermatitis\n\nA randomized trial in 49 patients with atopic dermatitis tested sea buckthorn pulp oil against seed oil against placebo for 4 months. The pulp oil — rich in palmitoleic acid and carotenoids — produced a statistically significant improvement in dermatitis severity (P < 0.01), while the seed oil did not reach statistical significance. [6] The pulp oil group also showed an increase in HDL cholesterol as a secondary finding.\n\nThe skin benefit is attributed to palmitoleic acid's role as a component of the epidermal lipid barrier, combined with the anti-inflammatory carotenoids (beta-carotene, zeaxanthin, lycopene) concentrated in the pulp oil. Together, these support both the physical integrity of the skin and dampen the inflammatory signaling that drives atopic dermatitis flares.\n\nCardiovascular and Lipid Benefits\n\nA 2022 meta-analysis of 15 randomized controlled trials confirmed that sea buckthorn supplementation significantly improves blood lipid profiles. [1] The effects were:\n\n- Triglycerides: reduced (standardized mean difference –0.72 — a moderate-to-large effect)\n- Total cholesterol: reduced (SMD –0.35)\n- LDL cholesterol: reduced (SMD –0.40)\n- HDL cholesterol: increased (SMD +0.37)\n\nThese effects were concentrated in participants with abnormal baseline lipid levels. In people with already-healthy lipids, the effects were smaller and inconsistent — suggesting sea buckthorn corrects dyslipidemia rather than pushing lipids below normal levels. This is a useful feature: it acts where it's needed.\n\nA double-blind RCT of 19 hypercholesterolemic women drinking 50 mL of sea buckthorn juice daily for 8 weeks found significant improvements in LDL (P < 0.05), HDL (P < 0.001), and CRP — a marker of systemic inflammation — along with reductions in body weight, BMI, and visceral fat.\n\nAnti-Inflammatory Effects\n\nThe Larmo et al. 2008 RCT — a well-powered double-blind trial of 254 healthy volunteers — found that sea buckthorn berry supplementation produced a statistically significant reduction in serum C-reactive protein (CRP) versus placebo (P = 0.039), indicating a genuine anti-inflammatory effect at the systemic level. [2] CRP is one of the most clinically used markers of systemic inflammation and cardiovascular risk.\n\nThe anti-inflammatory mechanism is multifactorial: the flavonoids (quercetin, isorhamnetin, kaempferol) in sea buckthorn berries inhibit NF-κB-driven inflammatory signaling, and the carotenoids act as lipid-soluble antioxidants that intercept reactive oxygen species before they can trigger inflammatory cascades.\n\nGlycemic and Insulin Effects\n\nA randomized crossover study in 18 overweight and obese men found that consuming sea buckthorn puree alongside a sucrose-containing meal reduced postprandial insulin by 39.6% at 30 minutes and improved the glycaemic profile by 44.7% compared to a control meal. [5] Strawberry puree showed no equivalent effect, suggesting this is specific to sea buckthorn's polyphenol composition — likely via inhibition of carbohydrate-digesting enzymes and slowing of glucose absorption.\n\nPractical Use\n\nSea buckthorn is available in several forms with different applications:\n\n- Berry juice or concentrate: the most convenient source of the polyphenols and vitamin C; 50–100 mL/day is a typical dose in human trials\n- Pulp oil capsules: the primary source of omega-7/palmitoleic acid; 2–3 g/day is the dose used in the dry eye and skin trials; look specifically for pulp oil, not seed oil — they differ significantly in fatty acid composition\n- Berry powder: dried whole berry, retains polyphenols; convenient for smoothies\n- Seed oil: higher in omega-3 and omega-6 (less omega-7 than pulp oil), milder in carotenoids\n\nThe berries have a very tart, sour taste that most people find hard to enjoy plain — diluted juice, capsules, or powder are more practical for regular use.\n\nSea buckthorn pulp oil can cause stools to turn orange at higher doses — this is harmless and reflects the carotenoid content. It is generally well-tolerated with no significant adverse effects reported in clinical trials.\n\nSee our Omega-3 page for the better-studied long-chain fatty acids, our Vitamin C page for more on high-dose vitamin C research, and our Dry Eye / Eye Health page for complementary eye support strategies.","deepText":"Evidence Review\n\nGeng et al. 2022 — Systematic Review and Meta-Analysis (Metabolic Syndrome)\n\nThis meta-analysis [1] in Phytotherapy Research is the most comprehensive synthesis of sea buckthorn's effects on cardiometabolic risk factors. The analysis included 15 randomized controlled trials with diverse populations and preparations.\n\nKey findings:\n- Triglycerides: SMD –0.722 (95% CI: –1.046 to –0.399, P < 0.001) — statistically significant reduction\n- Total cholesterol: SMD –0.345 (P < 0.001)\n- LDL cholesterol: SMD –0.396 (P < 0.001)\n- HDL cholesterol: SMD +0.370 (P < 0.001)\n- No significant effects on fasting glucose, HbA1c, blood pressure, or BMI in the pooled analysis\n\nLimitations: High heterogeneity (I² 79–90%) across included trials, reflecting differences in preparation (berries vs. oil vs. juice), dose, population, and duration. The authors found that lipid benefits were concentrated in participants with abnormal baseline values — a pattern consistent with corrective rather than pharmacological action. Most included trials were moderate quality; no trial was rated high quality by standard risk-of-bias assessment.\n\nInterpretation: The consistent direction of lipid benefit across 15 trials with diverse preparations is reassuring, but the heterogeneity limits precision on optimal dose and form. The baseline-dependent effect is a practical signal for who is most likely to benefit.\n\nLarmo et al. 2008 — Double-Blind RCT (Inflammation and Infection)\n\nThis trial [2] randomized 254 healthy Finnish adults to sea buckthorn berry supplementation or placebo for 90 days. It is the primary human evidence for sea buckthorn's anti-inflammatory effect.\n\nDesign: 254 enrolled, 233 completed. Placebo-controlled, double-blind. Primary endpoints: incidence and severity of cold and GI infections. Secondary endpoints: inflammatory markers including CRP.\n\nResults:\n- No significant reduction in cold or GI infection rates (the primary endpoint was not met)\n- CRP: sea buckthorn group showed a significant reduction vs. placebo (median change difference –0.059 mg/L, P = 0.039)\n- No significant effects on other measured inflammatory markers\n\nInterpretation: The trial failed its primary efficacy endpoint but found a meaningful CRP reduction — a clinically relevant secondary finding. The authors note that a 90-day trial in healthy adults is a difficult design for demonstrating infection rate reduction. The CRP finding suggests real anti-inflammatory activity even in a healthy population without elevated baseline inflammation, which is notable. The study is well-designed with adequate power for the primary outcome, adding credibility to the CRP result as a genuine secondary finding rather than a spurious one.\n\nLarmo et al. 2010 — Double-Blind RCT (Dry Eye)\n\nThis trial [3] in the Journal of Nutrition is the most direct test of sea buckthorn oil's mucosal omega-7 hypothesis. One hundred participants with dry eye symptoms were randomized to 2 g/day sea buckthorn oil or placebo for 3 months.\n\nDesign: 100 enrolled, 86 completed (intent-to-treat analysis for primary outcomes). Outcome measures: tear film osmolarity (primary), ocular surface symptoms including redness and burning.\n\nResults:\n- Tear film osmolarity: the seasonal increase in osmolarity (a dry eye progression marker) was significantly attenuated in the sea buckthorn group vs. placebo (P < 0.05)\n- Redness: significantly reduced in the sea buckthorn group in intent-to-treat analysis\n- Burning sensation: significantly reduced in per-protocol analysis\n- Tear production (Schirmer test): no significant change\n\nInterpretation: This is a clean, well-designed trial in an area where few effective nutritional interventions exist. The mechanism — dietary palmitoleic acid improving meibomian gland lipid composition and thus stabilizing the tear film — is biologically plausible and supported by the trial's positive outcome. The finding that tear production was unchanged while osmolarity (concentration) was reduced points to improved evaporation resistance (a lipid layer effect) rather than increased aqueous output, consistent with the omega-7 mechanism.\n\nCiesarová et al. 2020 — Comprehensive Composition Review\n\nThis review [4] in Food Research International synthesizes the phytochemical literature on sea buckthorn's composition across berries, leaves, seed, and pulp oil. It is the best single reference for claims about nutritional content.\n\nKey compositional facts documented:\n- Vitamin C: 120–695 mg/100 g fresh weight (variance by subspecies and growing conditions); consistently among the highest of any fruit, exceeding rosehip and far exceeding citrus\n- Carotenoids: 30–300 mg/100 g in pulp, primarily beta-carotene, lycopene, zeaxanthin, and lutein — the orange colour is an index of carotenoid density\n- Tocopherols: 100–900 mg/kg in pulp oil — among the highest of any plant oil\n- Palmitoleic acid (omega-7): 17–32% of fatty acids in pulp oil; negligible in seed oil\n- Polyphenols: isorhamnetin, quercetin, kaempferol (flavonols); proanthocyanidins; ellagitannins; phenolic acids\n\nSignificance for interpreting trial results: The wide compositional ranges explain some of the heterogeneity in clinical trials — a preparation from one subspecies at one dose may deliver 10-fold more active compounds than another. Standardization of sea buckthorn products by key active constituents (particularly omega-7 content, carotenoid content, or vitamin C content) would substantially improve research precision.\n\nMortensen et al. 2018 — Randomized Crossover (Glycaemic Response)\n\nThis crossover study [5] in the European Journal of Nutrition tested sea buckthorn puree's effect on postprandial glucose and insulin in 18 overweight/obese men.\n\nDesign: Four-arm crossover (sea buckthorn, strawberry, sugar solution with matched sucrose, inulin control), with standardized sucrose-containing meals. Outcome: postprandial glucose and insulin area under the curve (AUC) at 30, 60, 90, and 120 minutes. …","deepTruncated":true,"references":[{"id":"1","title":"Effects of sea buckthorn (Hippophae rhamnoides L.) on factors related to metabolic syndrome: A systematic review and meta-analysis of randomized controlled trial","authors":"Geng Y, Wang J, Chen K","year":2022,"journal":"Phytotherapy Research","pmid":"36043374","url":"https://pubmed.ncbi.nlm.nih.gov/36043374/"},{"id":"2","title":"Effects of sea buckthorn berries on infections and inflammation: a double-blind, randomized, placebo-controlled trial","authors":"Larmo P, Alin J, Salminen E","year":2008,"journal":"European Journal of Clinical Nutrition","pmid":"17593932","url":"https://pubmed.ncbi.nlm.nih.gov/17593932/"},{"id":"3","title":"Oral sea buckthorn oil attenuates tear film osmolarity and symptoms in individuals with dry eye","authors":"Larmo PS, Järvinen RL, Setälä NL","year":2010,"journal":"Journal of Nutrition","pmid":"20554904","url":"https://pubmed.ncbi.nlm.nih.gov/20554904/"},{"id":"4","title":"Why is sea buckthorn (Hippophae rhamnoides L.) so exceptional? A review","authors":"Ciesarová Z, Murkovic M, Cejpek K","year":2020,"journal":"Food Research International","pmid":"32466930","url":"https://pubmed.ncbi.nlm.nih.gov/32466930/"},{"id":"5","title":"Sea buckthorn decreases and delays insulin response and improves glycaemic profile following a sucrose-containing berry meal: a randomised, controlled, crossover study","authors":"Mortensen MW, Spagner C, Cuparencu C","year":2018,"journal":"European Journal of Nutrition","pmid":"29022100","url":"https://pubmed.ncbi.nlm.nih.gov/29022100/"},{"id":"6","title":"Effects of dietary supplementation with sea buckthorn (Hippophaë rhamnoides) seed and pulp oils on atopic dermatitis","authors":"Yang B, Kalimo KO, Mattila LM","year":1999,"journal":"Journal of Nutritional Biochemistry","pmid":"15539258","url":"https://pubmed.ncbi.nlm.nih.gov/15539258/"}],"wordCount":2330,"source":{"path":"src/content/topics/sea-buckthorn/omega-7-skin-and-metabolic-health.md"},"citeAs":"“Does sea buckthorn improve cholesterol, dry eyes and skin?.” What's Healthy and Why. https://whatshealthyandwhy.com/sea-buckthorn/omega-7-skin-and-metabolic-health","notice":"General information backed by peer-reviewed research, not medical advice."}