Hermetica Superfood Encyclopedia
The Short Answer
Oregon grape (Mahonia aquifolium) contains berberine, an isoquinoline alkaloid that demonstrates antimicrobial activity against Candida, H. pylori, and antibiotic-resistant bacteria. The herb exhibits anti-inflammatory effects through lipoxygenase inhibition and has been traditionally used by Pacific Northwest tribes for skin conditions.
CategoryHerbs (Global Traditional)
GroupNative American
Evidence LevelModerate
Primary KeywordOregon grape benefits
Synergy Pairings3
Oregon Grape (Mahonia aquifolium) — botanical close-up
Health Benefits
Origin & History
Natural habitat
Oregon grape (Mahonia aquifolium) is a perennial evergreen shrub native to the Pacific Northwest of North America, featuring holly-like leaves, yellow flowers, and blue-purple berries. The medicinal parts are primarily the root and root bark, which contain isoquinoline alkaloids, particularly berberine, and are traditionally extracted via tinctures, decoctions, or propylene glycol extracts.
“Native American tribes of the Pacific Northwest traditionally used Oregon grape root for skin conditions, infections, digestive issues, and liver support. European settlers and 19th-century Eclectic physicians adopted it as a sustainable alternative to goldenseal, employing it as a 'constitutional cleanser' for systemic imbalances affecting skin, digestion, and mucous membranes.”Traditional Medicine
Scientific Research
The research dossier reveals a notable absence of human clinical trials, RCTs, or meta-analyses specifically for Mahonia aquifolium. The only study referenced (PMC10830684) examined Oregon grape root extracts in cell models (Caco-2, MDCKII) for P-glycoprotein inhibition, demonstrating reduced transport of cyclosporine A and digoxin at concentrations of 0.05-1 mg/mL, but this remains in vitro data without clinical validation.
Preparation & Dosage
Traditional preparation
Traditional tincture preparation uses 10g crushed bark in 100ml vodka, taken as 5-15 drops diluted in water. No clinically studied dosage ranges are available from human trials. In vitro studies used extracts at 0.05-1 mg/mL concentrations. Consult a healthcare provider before starting any new supplement.
Nutritional Profile
{"macronutrients": {"fiber": "Approximately 2.5 grams per 100 grams of fresh berries", "protein": "Approximately 1 gram per 100 grams of fresh berries"}, "micronutrients": {"vitamin_C": "Approximately 10 mg per 100 grams of fresh berries", "vitamin_A": "Present in small amounts, primarily as beta-carotene", "iron": "Approximately 0.3 mg per 100 grams of fresh berries", "calcium": "Approximately 20 mg per 100 grams of fresh berries"}, "bioactive_compounds": {"berberine": "Concentration varies, typically around 0.5-3% in root and bark extracts", "palmatine": "Present in smaller quantities compared to berberine", "oxyacanthine": "Present in trace amounts"}, "bioavailability_notes": "Berberine has low oral bioavailability, but its effects are enhanced through enterohepatic recirculation. The bioavailability of vitamins and minerals may be influenced by the presence of other dietary components."}
How It Works
Mechanism of Action
Oregon grape's primary bioactive compound berberine disrupts bacterial cell membrane integrity and inhibits DNA gyrase in pathogenic microorganisms. The alkaloid also blocks lipoxygenase enzymes, reducing inflammatory mediator production including leukotrienes. Additional isoquinoline alkaloids like palmatine and canadine contribute to antimicrobial activity through similar membrane disruption mechanisms.
Clinical Evidence
Preclinical studies demonstrate Oregon grape extract inhibits Candida albicans growth at concentrations of 125-250 μg/mL and shows activity against Helicobacter pylori. In vitro research confirms effectiveness against methicillin-resistant Staphylococcus aureus strains. However, human clinical trials are lacking, with evidence limited to traditional use reports and laboratory studies. Current research focuses primarily on topical applications for skin conditions rather than systemic antimicrobial effects.
Safety & Interactions
Oregon grape is generally well-tolerated topically but may cause skin irritation in sensitive individuals. Internal use can cause gastrointestinal upset, nausea, and diarrhea at higher doses. Berberine may interact with blood glucose medications and antibiotics, potentially enhancing their effects. Pregnant and breastfeeding women should avoid internal use due to insufficient safety data and potential uterine stimulant properties.
Synergy Stack
Hermetica Formulation Heuristic
Also Known As
Mahonia aquifoliumMountain GrapeHolly-leaved BarberryTall Oregon GrapeBlue BarberryRocky Mountain GrapeMahoniaWild Oregon Grape
Frequently Asked Questions
What is the active compound in Oregon grape?
The primary active compound is berberine, an isoquinoline alkaloid that provides antimicrobial and anti-inflammatory effects. Other alkaloids include palmatine and canadine, which contribute to the herb's therapeutic properties.
How much berberine is in Oregon grape root?
Oregon grape root typically contains 0.5-1.5% berberine by weight, with concentrations varying based on harvest time and plant maturity. Standardized extracts often contain 10-15% total alkaloids including berberine.
Can Oregon grape treat yeast infections?
Laboratory studies show Oregon grape extract inhibits Candida albicans at 125-250 μg/mL concentrations. However, human clinical trials are lacking, and it should not replace proven antifungal treatments without medical supervision.
Is Oregon grape safe during pregnancy?
Oregon grape is not recommended during pregnancy due to insufficient safety data and berberine's potential uterine stimulant effects. Pregnant women should consult healthcare providers before using any berberine-containing herbs.
What's the difference between Oregon grape and barberry?
Both contain berberine, but Oregon grape (Mahonia aquifolium) is native to North America while barberry (Berberis vulgaris) is European. Oregon grape typically has lower berberine concentrations but similar therapeutic properties.
Does Oregon grape interact with antibiotics or antimicrobial medications?
Oregon grape contains berberine, which has its own antimicrobial properties, so concurrent use with prescription antibiotics should be discussed with a healthcare provider to avoid potential interactions or redundant effects. Some evidence suggests berberine may affect how certain medications are metabolized through cytochrome P450 enzymes, though human clinical data is limited. It is advisable to space Oregon grape supplementation several hours apart from antibiotic dosing and consult your doctor before combining them.
What form of Oregon grape supplement is most bioavailable—extract, tincture, or powder?
Standardized extracts and tinctures typically deliver higher concentrations of berberine and other active alkaloids compared to whole powder, making them more bioavailable for systemic absorption. Tinctures (alcohol-based preparations) may offer faster absorption due to the solvent, while extracts can be more concentrated and easier to dose consistently. Whole root powders contain lower alkaloid density and require larger doses to achieve therapeutic levels, making them less efficient for bioavailability.
Who should avoid Oregon grape supplementation, and are there specific populations at higher risk?
People with kidney disease, liver dysfunction, or those taking blood thinners should avoid Oregon grape, as berberine may strain these systems and potentiate anticoagulant effects. Individuals with hypoglycemia or those taking diabetes medications should monitor blood sugar carefully, as Oregon grape may lower glucose levels. Additionally, those with severe gastrointestinal conditions or bile duct obstruction should consult a healthcare provider before use, given its cholagogue properties.
Explore the Full Encyclopedia
7,400+ ingredients researched, verified, and formulated for optimal synergy.
Browse IngredientsThese statements have not been evaluated by the Food and Drug Administration. This content is for informational purposes only and is not intended to diagnose, treat, cure, or prevent any disease.
hermetica-encyclopedia-canary-zzqv9k4w oregon-grape curated by Hermetica Superfoods at ingredients.hermeticasuperfoods.com and licensed CC BY-NC-SA 4.0 (non-commercial share-alike, attribution required)
