Omega-7 (Palmitoleic Acid): Sea Buckthorn, Mucous Membranes & Skin — A Research-Backed Guide
⚡ 60-Second Summary
Omega-7 is palmitoleic acid (16:1 n-7), a monounsaturated fatty acid concentrated in sea buckthorn pulp oil and macadamia nuts. The marketing pitch is broad — heart, skin, mucous membranes, metabolism — but the supporting evidence is mostly from small trials, mechanistic work, or animal studies. The clearest human signals are for dry eye and vaginal mucous-membrane atrophy using sea buckthorn oil specifically.
Best forms: sea buckthorn pulp oil (the most studied food source), macadamia nut oil (dietary), or purified marine palmitoleic acid (e.g., Provinal) for users wanting an isolated dose.
Typical dose: 1–2 g/day sea buckthorn oil or 210–420 mg/day purified palmitoleic acid, taken with food, for at least 8–12 weeks.
What is omega-7?
Palmitoleic acid is a monounsaturated 16-carbon fatty acid with its sole double bond located 7 carbons from the methyl end — hence "omega-7." It is endogenously synthesized in the liver from palmitic acid via the enzyme stearoyl-CoA desaturase 1 (SCD1). In 2008, a Cell paper by Cao and colleagues described palmitoleic acid as a "lipokine" — a fat-derived hormone-like signal — released from adipose tissue that influenced insulin sensitivity and lipid metabolism in mice. That paper kicked off a wave of interest in oral omega-7 supplements, though the human translation has been less impressive than the animal mechanism suggested.
Dietary sources include sea buckthorn pulp oil (30–50% palmitoleic acid), macadamia nuts (~16%), avocado oil (small amounts), and certain marine fish (purified for products like Provinal).
Evidence-based benefits of omega-7
1. Dry eye and tear-film support
The most replicable human signal. A 2014 RCT (Larmo et al.) gave 2 g/day of sea buckthorn oil to adults with dry eye for 3 months, and showed improvements in tear-film osmolarity and symptom scores compared with placebo. Effect sizes were modest. For dry eye, omega-3 remains better-evidenced and is typically tried first; sea buckthorn is a reasonable add-on or alternative.
2. Vaginal and mucous-membrane atrophy
A 2014 trial (Larmo et al.) in postmenopausal women showed that 3 g/day of sea buckthorn pulp oil for 3 months improved vaginal-epithelial integrity and lubrication scores. The effect is modest and doesn't replace local estrogen therapy when indicated, but is a non-hormonal option some women may try.
3. Skin barrier and dryness
Both topical and oral sea buckthorn improve skin hydration and transepidermal water loss in trials of 8–12 weeks. The oral effect is small. Topical sea buckthorn — for whatever it's worth — has a longer traditional use in dermatology.
4. Lipid and metabolic markers (mixed)
Trials of purified palmitoleic acid (Provinal, 210 mg/day) over 30 days have shown small reductions in CRP and triglycerides and a small rise in HDL. Other trials report no change. Mechanism is plausible but the human data are far below the bar of omega-3 evidence.
5. Glycemic and insulin sensitivity (mixed)
Despite the lipokine hypothesis, controlled human trials have not consistently shown improvements in HbA1c or fasting glucose. Some observational work even links higher endogenous palmitoleic acid with worse cardiovascular outcomes (probably reflecting de novo lipogenesis from high-carb diets), so the diet-derived versus liver-synthesized distinction matters.
Is omega-7 essential?
No. Humans synthesize palmitoleic acid endogenously and there is no recognized deficiency state or RDA. Supplementation is goal-directed (dry eye, mucous-membrane support), not corrective.
Sea buckthorn vs macadamia vs marine sources
| Form | Best for | Typical daily serving | Notes |
|---|---|---|---|
| Sea buckthorn pulp oil | Dry eye, mucous-membrane support | 1–2 g (≈400–800 mg palmitoleic) | The most studied form. Also delivers carotenoids and vitamin E. Pulp oil is richer in omega-7 than seed oil. |
| Sea buckthorn seed oil | Antioxidant + mixed fatty acids | 0.5–1 g | Lower in palmitoleic acid (≈3%); mainly omega-3 and -6. Often combined with pulp oil in products. |
| Purified marine palmitoleic acid (e.g., Provinal) | Isolated palmitoleic-acid dosing | 210–420 mg | Concentrated 50%+ palmitoleic acid from anchovy. Lipid and CRP signals at low doses. |
| Macadamia nut oil (food) | Dietary background intake | 1 Tbsp = ~2.2 g palmitoleic | Cooking-fat option to raise dietary omega-7 without supplements. |
How much omega-7 should you take?
- Sea buckthorn oil (general use): 1–2 g/day with food
- Dry eye / mucous membranes: 2–3 g/day for 12 weeks
- Purified palmitoleic acid: 210–420 mg/day
Set realistic expectations and judge effect after 8–12 weeks. The category is genuinely promising in a few niches and overhyped in many; if you don't notice a change after 3 months, it is reasonable to stop.
Safety, lipids & pregnancy
Common side effects
- Mild GI upset, occasional belching of "berry" flavor
- Orange-tinted skin or stools at very high sea buckthorn doses (carotenoids)
- Rare allergic reactions in users with mugwort or birch-pollen allergy
Lipid considerations
Endogenous palmitoleic acid is associated in some prospective studies with worse cardiometabolic outcomes — probably as a marker of high de novo lipogenesis from carbohydrate. Whether dietary palmitoleic acid carries similar risk is unclear; current evidence does not show harm at supplement doses, but the marketing claim that omega-7 lowers cardiovascular risk is not well supported.
Pregnancy and breastfeeding
Sea buckthorn oil has a long food-medicine history but limited modern safety data in pregnancy. Defer to your obstetrician.
Bleeding and surgery
Mild antiplatelet effect at high sea buckthorn doses. Pause 1 week before elective surgery.
Drug and nutrient interactions
- Anticoagulants and antiplatelets — minor additive effect at high doses.
- Antihypertensives — possible mild additive BP-lowering at multi-gram doses; rarely clinically significant.
- Statins — no documented interaction.
- Hormone-replacement therapy — sea buckthorn does not appear to interact with HRT, but mucous-membrane benefits may overlap.
- Allergens — possible cross-reactivity in people with mugwort/birch-pollen allergy.
Use our free interaction checker for additional combinations.
Who might benefit — and who shouldn't bother
| Most likely to benefit | Less likely to benefit |
|---|---|
| Adults with chronic dry eye who want a non-omega-3 add-on | People expecting omega-3-level cardiometabolic benefit |
| Postmenopausal women with mild vaginal atrophy | Adults with high de novo lipogenesis or insulin resistance |
| People with general mucous-membrane dryness (mouth, eye, vagina) | Pregnant or breastfeeding women without OB approval |
| Cooks who already enjoy macadamia oil for flavor | Adults with mugwort or birch-pollen allergy |
Frequently asked questions
How much omega-7 should I take per day?
1–2 g/day of sea buckthorn pulp oil for general use, 2–3 g/day for dry-eye or mucous-membrane targets. Purified palmitoleic acid (Provinal) is dosed at 210–420 mg/day.
Is sea buckthorn oil the same as omega-7?
Sea buckthorn pulp oil is rich in omega-7 (30–50% palmitoleic acid), but it also delivers carotenoids, vitamin E, and other fatty acids — so its effects can't be assigned solely to omega-7.
Does omega-7 lower cholesterol?
Some small trials of purified palmitoleic acid (Provinal) show modest reductions in CRP and triglycerides. The evidence is preliminary; omega-3, statins, and lifestyle remain better-supported tools.
Is omega-7 safe long term?
Sea buckthorn and macadamia oils have a long food history without clear safety concerns. Purified palmitoleic-acid trials have run up to 30 days; longer data are limited.
Can omega-7 replace omega-3?
No. Omega-3 evidence is far stronger and broader. Omega-7 is a niche add-on for specific symptoms.
Does omega-7 cause weight gain?
No. Supplement doses provide minimal calories and have not been linked to weight gain in human trials.
Related ingredients and articles
Omega-3
The better-evidenced first choice for dry eye and inflammation.
Sea Buckthorn
The whole-plant context: not just omega-7.
Vitamin E
Often paired with omega-7 in skin formulas.
Omega-9
The other monounsaturated supplement — and why diet usually wins.
Disclaimer: This information is for educational purposes only and should not replace medical advice. Always consult a qualified healthcare provider before starting any supplement, especially if you have a medical condition, are pregnant, or take prescription medications. These statements have not been evaluated by the Food and Drug Administration. This product is not intended to diagnose, treat, cure, or prevent any disease.