Oregon Grape Root for Psoriasis (Topical)

Pacific Northwest Native American medicine — root and bark for skin and digestive complaints

Evidence: Moderate — randomized, double-blind, placebo-controlled trials of 10% topical cream: significant improvement in mild–moderate plaque psoriasis

Illustration: Oregon grape (Mahonia aquifolium) — holly-like leaves and berry clusters

What it is and what it is used for

Oregon grape (Mahonia aquifolium, syn. Berberis aquifolium) root bark, applied as a cream for mild–moderate plaque psoriasis. A 200-patient randomized, double-blind, placebo-controlled trial of 10% cream found significant improvement in psoriasis severity scores; a bilateral 82-patient trial found lesions improved or disappeared in 36% versus 22.5% on placebo. The active alkaloid is berberine — the same compound that turns the inner bark and roots bright yellow.

Safety and disclaimers

• Topical use in trials was well tolerated.
• Berberine is the concern internally: avoid Oregon grape preparations in pregnancy and nursing (uterine stimulation; bilirubin displacement risk in newborns) and in young children.
• Potential drug interactions via CYP3A4 — discuss with a pharmacist if you take prescription drugs.
• NEVER dig wild roots — Oregon grape is on the United Plant Savers At-Risk list. Use cultivated sources only.

Recipe

Ingredients:

• Dried Oregon grape root bark (Mahonia aquifolium), cultivated source only, 30 g
• 250 ml olive oil
• 30 g beeswax, grated

Preparation:

1. Warm the root bark in the oil in a double boiler on low heat 2–3 hours; do not boil.
2. Strain through cheesecloth, return oil to heat, melt in the beeswax, pour into a jar and cool.
3. Note: trials used a standardized 10% cream (0.1% berberine). This home salve is a traditional approximation, not an equivalent.

Dosage / directions: Apply thinly to psoriatic plaques 2–3 times daily. Stop if irritation develops; see a dermatologist for severe or spreading psoriasis.

Folk history

Pacific Northwest tribes used the yellow root bark long before settlers arrived — for skin, for digestion, as a dye. When the plant reached European gardens it was planted as an ornamental, and hardly anyone guessed the holly-like shrub by the driveway was a pharmacy. Modern trials finally tested what the tribes already knew about skin.

Scientific references

• Report on three clinical trials of Mahonia aquifolium 10% topical cream for plaque psoriasis — https://www.researchgate.net/publication/7614391_A_Report_on_Three_Recent_Clinical_Trials_Using_Mahonia_aquifolium_10_Topical_Cream_and_a_Review_of_the_Worldwide_Clinical_Experience_With_Mahonia_aquifolium_for_the_Treatment_of_Plaque_Psoriasis