Buckthorn refers to several different plants, and their uses vary dramatically depending on which one you’re dealing with. Sea buckthorn (Hippophae rhamnoides) is a berry-producing shrub prized for its nutrient-dense oil and fruit, while common buckthorn and alder buckthorn (Rhamnus and Frangula species) have bark traditionally used as a potent laxative. Understanding which buckthorn you’re looking at matters, because one is a nutritional powerhouse and the other is a strong-acting herbal medicine with real risks if misused.
Two Very Different Plants Share One Name
Sea buckthorn grows in cold, mountainous regions across Asia and Europe, producing bright orange berries packed with vitamins, fatty acids, and antioxidants. It has a long history in traditional Chinese and Tibetan medicine and is increasingly popular in Western supplements, skincare products, and functional foods.
Alder buckthorn and common (European) buckthorn are unrelated shrubs whose dried bark contains anthraquinone compounds, the same class of chemicals found in senna and cascara sagrada. These plants have been used for centuries as natural laxatives. The berries of alder buckthorn ripen from green to red to black, and the bark has also been used historically as a textile dye, producing brown and yellow shades when dried, or orange, pink, and bright red tones when the bark is allowed to decay before dyeing.
Sea Buckthorn for Skin Health
Sea buckthorn oil is one of the richest plant sources of omega-7 fatty acids (palmitoleic acid), which make up roughly 48% of the oil. This fatty acid profile, combined with high levels of vitamins C and E, makes the oil particularly relevant for skin repair. In animal studies on burn wounds, sea buckthorn seed oil significantly improved healing times. Sheep with full-thickness burns treated with the oil reached 95% re-epithelialization compared to 83% in untreated controls, and complete healing took about 14 days instead of nearly 20.
The mechanisms behind this go beyond simple moisturizing. Sea buckthorn components promote collagen deposition (particularly type-III collagen, which is critical in early wound repair), stimulate new blood vessel growth, and reduce oxidative damage at the wound site. These effects have been demonstrated with both seed oil and leaf extracts, though through slightly different pathways.
For inflammatory skin conditions like eczema and psoriasis, sea buckthorn shows promise through a different route. In mouse models of atopic dermatitis, topical application of the oil reduced skin thickening, decreased immune cell infiltration, and calmed the overactive inflammatory signaling that drives flare-ups. Flavonoids extracted from sea buckthorn also improved skin barrier function by boosting production of filaggrin, a protein essential for maintaining the skin’s protective outer layer. Human clinical studies on eczema have used both seed and pulp oils, though standardized dosing recommendations don’t yet exist.
Sea Buckthorn for Heart Health
Several clinical findings suggest sea buckthorn may benefit cardiovascular health. In patients with high blood pressure, sea buckthorn flavonoids performed comparably to a standard class of blood pressure medications (calcium channel blockers) in reducing diastolic blood pressure. Sea buckthorn seed oil also normalized both systolic and diastolic blood pressure in people with high cholesterol while simultaneously lowering cholesterol, oxidized LDL, and triglycerides. In overweight women, consuming dried sea buckthorn berries, oil, or phenolic extracts reduced total cholesterol, LDL, and intermediate-density lipoprotein levels.
These results are encouraging but come from relatively small studies. No regulatory body has approved sea buckthorn as a treatment for cardiovascular disease.
Sea Buckthorn Dosing
There is no internationally standardized dose for sea buckthorn. The Chinese Pharmacopoeia lists 3 to 10 grams of sea buckthorn fruit for medicinal purposes, while traditional ethnic medicine practitioners have recommended around 20 grams of fruit daily. Health Canada’s Natural Health Products Database lists sea buckthorn oil as an approved ingredient with a general recommendation of 1 gram per day. Clinical trials have used doses as high as 28 grams of extract daily for 90 days in healthy volunteers. The wide range reflects how much the concentration of active compounds varies between whole berries, seed oil, pulp oil, and standardized extracts.
Buckthorn Bark as a Laxative
The bark of alder buckthorn and European buckthorn contains anthraquinone glycosides, compounds that work by stimulating the muscles of the large intestine to contract more forcefully while also pulling water into the colon. The result is a strong, soft bowel movement, typically within 6 to 12 hours. This is the same mechanism behind over-the-counter laxatives derived from senna and cascara sagrada.
Buckthorn bark must be properly aged or heat-treated before use. Fresh bark contains compounds that cause severe nausea and vomiting. Traditional preparation involved storing the bark for at least one year, or heating it to accelerate the breakdown of these emetic compounds. Using improperly prepared bark can cause violent gastrointestinal distress rather than the intended gentle laxative effect.
It’s worth noting that the FDA does not recognize buckthorn as safe and effective for over-the-counter use as a digestive aid. Under current U.S. regulations, any product containing buckthorn marketed for this purpose is classified as an unapproved new drug. This doesn’t mean the laxative effect isn’t real. It means the evidence submitted to regulators was considered insufficient to establish both safety and effectiveness for standardized consumer use.
Potassium Loss and Drug Interactions
The laxative forms of buckthorn carry a specific risk that goes beyond digestive discomfort. Prolonged or heavy use of anthraquinone laxatives depletes potassium from the body. Low potassium is dangerous on its own, but it becomes particularly risky if you take certain medications.
Both alder buckthorn and European buckthorn are flagged for interactions with cardiac glycosides, a class of heart medications, because potassium loss can amplify those drugs’ effects to toxic levels. The interaction works the same way it does with other stimulant laxatives like aloe latex and cascara. If you take heart medications, blood pressure drugs, or diuretics that already affect potassium levels, combining them with buckthorn bark laxatives compounds the depletion.
Short-term, occasional use of properly prepared buckthorn bark is generally considered low-risk for otherwise healthy adults. Chronic use is a different story, as ongoing potassium loss can affect heart rhythm and muscle function even without other medications in the picture.
Supplements vs. Whole Berries
Sea buckthorn is available as capsules (seed oil or pulp oil), liquid oil for topical or oral use, dried berry powder, juice, and as an ingredient in skincare products. The composition varies significantly between these forms. Seed oil is higher in omega-3 and omega-6 fatty acids, while pulp oil contains more omega-7 and carotenoids. Whole berries and juice provide vitamin C and flavonoids that concentrated oil extracts may lack.
For skin applications, both topical oil and oral supplementation have shown effects in research, though topical use delivers compounds directly to the site. For cardiovascular or digestive benefits, oral forms are the relevant choice. Because no standardized dosing exists across formulations, reading labels for the specific type of extract and its concentration matters more than simply looking for “sea buckthorn” on the bottle.