Supplement analysis backed by scientific evidence · PT

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Limited evidenceJoints & skin

Oregon Grape

Oregon grape cream has modest randomized evidence for mild-to-moderate plaque psoriasis, where it beats placebo but loses to standard prescription topicals. Taken orally it is essentially a weak, unstandardized berberine source, and berberine itself is the better-studied buy.

What the science says

  • Improves mild-to-moderate plaque psoriasis (topical) Moderate evidence

    A double-blind placebo-controlled trial of about 200 patients using a 10% Mahonia aquifolium cream found significant improvement in psoriasis severity and quality-of-life scores over 12 weeks versus vehicle. A review of three trials plus wider clinical experience reports improvement in roughly 60-80% of users in open studies. In half-side comparisons against calcipotriol, Mahonia performed less well, so it is a gentler second-line option rather than a replacement for prescription therapy.

  • Helps eczema and other inflammatory skin conditions Limited evidence

    Berberine and berbamine inhibit keratinocyte proliferation and lipoxygenase in vitro, which is the proposed mechanism for the psoriasis effect and the rationale for eczema use. Controlled trials in atopic dermatitis are absent; the dermatology reviews that cover botanicals list Mahonia's evidence as confined to psoriasis.

  • Oral use for blood sugar, cholesterol, or gut infections Limited evidence

    These claims are borrowed wholesale from the berberine literature, but Oregon grape root supplements are rarely standardized and typically deliver far less berberine than the 500 mg three-times-daily doses used in metabolic trials. If you want berberine's metabolic effects, take standardized berberine; if you take Oregon grape expecting them, you are guessing at your own dose.

  • 'Blood purifier' and liver detox tonic Limited evidence

    Oregon grape's traditional reputation as an alterative or blood purifier corresponds to no measurable physiological endpoint and has never been tested. There is no human data on liver function, bile flow, or any detoxification marker with Mahonia aquifolium.

Dosage & safety

Studied doseTopical: 10% Mahonia aquifolium extract cream applied to affected areas two to three times daily; trials ran 4-12 weeks. Oral traditional doses are 1-2 g dried root as a decoction or 1-2 mL of tincture three times daily, with no standardization to berberine content and no trial support.
SafetyTopical use is well tolerated; burning, itching, and localized rash occur in a minority, and allergic contact dermatitis is reported. The oral safety profile is berberine's: avoid in pregnancy and while breastfeeding, and never give to neonates — berberine displaces bilirubin from albumin and raises kernicterus risk. Berberine is a significant CYP3A4 and P-glycoprotein inhibitor, so oral use can raise levels of many drugs (including cyclosporine, statins, and some anticoagulants); check interactions before taking it. High oral doses cause GI upset and may lower blood pressure and glucose. Not banned in sport. Oregon grape is not the same as barberry root (Berberis vulgaris) or goldenseal, though all three are berberine plants sold interchangeably.

Scientific references

Where to buy

Nature's Way, Oregon Grape, 500 mg, 90 Vegan Capsules

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