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Herb Library

Herb Library

Explore 5,320+ detailed herb profiles with safety data, evidence grades, and traditional uses.

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Oneflower Helianthella

Oneflower Helianthella

Helianthella uniflora

T — Traditional UseAsteraceae

Native American medicinal plant used as dermatological aid, orthopedic aid, analgesic, antirheumatic (external). Documented among Paiute, Shoshoni.

Oneleaf Onion

Oneleaf Onion

Allium unifolium

T — Traditional UseNartheciaceae

Native American medicinal plant used as poison. Documented among Mendocino Indian.

Oneseed Juniper

Oneseed Juniper

Juniperus monosperma

T — Traditional UseCupressaceae

Native American medicinal plant used as anticonvulsive, cold remedy, cough medicine, gynecological aid, antirheumatic (external), gastrointestinal aid. Documented among Apache, White Mountain, Hopi, Isleta.

Onion

Onion

Allium cepa

B — Good EvidenceLiliaceae

Medicinal food with antibiotic, anti-inflammatory, and expectorant properties. Used for coughs, colds, and bronchial infections. Also helps lower blood pressure and cholesterol.

Ontario Lobelia

Ontario Lobelia

Lobelia kalmii

T — Traditional UseCampanulaceae

Native American medicinal plant used as emetic, dermatological aid, ear medicine, love medicine. Documented among Cree, Hudson Bay, Iroquois.

Ophiopogon

Ophiopogon

Ophiopogon japonicus

C — Limited EvidenceAsparagaceae

A TCM yin-nourishing herb for dry coughs, thirst, constipation, and heart palpitations. Moistens the lungs and stomach.

Opium Poppy

Opium Poppy

Papaver somniferum

T — Traditional UsePapaveraceae

Native American medicinal plant used as analgesic, anticonvulsive, sedative, stimulant. Documented among Cherokee.

Oppositeleaf Bahia

Oppositeleaf Bahia

Picradeniopsis oppositifolia

T — Traditional UseAsteraceae

Native American medicinal plant used as dermatological aid, gastrointestinal aid, herbal steam, panacea. Documented among Navajo, Ramah.

Orange Agoseris

Orange Agoseris

Agoseris aurantiaca

T — Traditional UseAsteraceae

Native American medicinal plant used as ceremonial medicine, dermatological aid, disinfectant, emetic, orthopedic aid, panacea. Documented among Navajo, Ramah.

Orange Milkwort

Orange Milkwort

Polygala lutea

T — Traditional UsePolygalaceae

Native American medicinal plant used as dermatological aid, antirheumatic (external), blood medicine, heart medicine, other, respiratory aid. Documented among Choctaw, Seminole.

Oregano Essential Oil

Oregano Essential Oil

Origanum vulgare (essential oil)

B — Good EvidenceLamiaceae

Concentrated antimicrobial essential oil — 60-80% carvacrol. For topical antifungal (nail fungus, athletes foot) and diluted internal use for SIBO/Candida (enteric capsules). NEVER use undiluted. More concentrated than "oil of oregano" supplements.

Oregano Oil

Oregano Oil

Origanum vulgare (essential oil)

B — Good EvidenceLamiaceae

Potent antimicrobial essential oil — carvacrol and thymol kill bacteria, fungi, and parasites on contact. For SIBO, Candida, colds, and food poisoning. ALWAYS dilute. Enteric-coated capsules protect gut flora. Short-term use only.

Oregano Oil Capsule

Oregano Oil Capsule

Origanum vulgare (oil capsule)

C — Limited EvidenceLamiaceae

Oregano essential oil in capsule — 150mg per capsule. Very potent antimicrobial. Short-term use (10-14 days). Take with food. Follow with probiotics after course.

Oregano Oil Capsules

Oregano Oil Capsules

Origanum vulgare (enteric)

C — Limited EvidenceLamiaceae

Enteric-coated oregano oil capsules — bypasses stomach to release in intestines. Used for SIBO, candida, and intestinal infections. Stronger than non-enteric.

Oregano Oil Liquid

Oregano Oil Liquid

Origanum vulgare (liquid oil)

C — Limited EvidenceLamiaceae

Liquid oregano oil in olive oil carrier — 2-4 drops under tongue or in water. EXTREMELY potent. Short-term use only (7-14 days). Follow with probiotics.

Oregon Bitterroot

Oregon Bitterroot

Lewisia rediviva

T — Traditional UsePortulacaceae

Native American medicinal plant used as throat aid, breast treatment, gynecological aid, heart medicine, pulmonary aid, blood medicine. Documented among Blackfoot, Flathead, Nez Perce.

Oregon Fawnlily

Oregon Fawnlily

Erythronium oregonum

T — Traditional UseNartheciaceae

Native American medicinal plant used as dermatological aid. Documented among Wailaki.

Oregon Geranium

Oregon Geranium

Geranium oreganum

T — Traditional UseGeraniaceae

Native American medicinal plant used as antirheumatic (external), antidiarrheal, dermatological aid, oral aid. Documented among Miwok, Montana Indian, Salish.

Oregon Oxalis

Oregon Oxalis

Oxalis oregana

T — Traditional UseOxalidaceae

Native American medicinal plant used as eye medicine, dietary aid, other, antirheumatic (external), dermatological aid, disinfectant. Documented among Cowlitz, Karok, Makah.

Oregon White Oak

Oregon White Oak

Quercus garryana

T — Traditional UseFagaceae

Native American medicinal plant used as tuberculosis remedy, gynecological aid. Documented among Cowlitz, Karok.

Oriental Pipewort

Oriental Pipewort

Eriocaulon sp

T — Traditional UseEriocaulaceae

Traditional medicinal plant used for ache(head), anodyne, cephalgia, epistaxis, hemicrania, opacity, sunstroke, vermifuge.

Oriental Storax

Oriental Storax

Liquidambar orientalis

T — Traditional UseHamamelidaceae

Traditional medicinal plant used for antidote, antiseptic, cancer, cold, convulsion, cough, epilepsy, expectorant, and other conditions. Known from ethnobotanical records across multiple cultures.

Orris

Orris

Iris x germanica

T — Traditional UseIridaceae

A medicinal plant (Iris x germanica) from the Iridaceae family used in traditional medicine.

Ostrich fern

Ostrich fern

Matteuccia pennsylvanica

T — Traditional UseDryopteridaceae

A medicinal plant (Matteuccia pennsylvanica) from the Dryopteridaceae family used in traditional medicine.

Otaheite chestnut

Otaheite chestnut

Inocarpus edulis

T — Traditional UseFabaceae

Traditional medicinal plant used for antidote(fish), astringent, bloodshot, diarrhea, enterosis, eye, hemorrhage, medicine, and other conditions. Known from ethnobotanical records across multiple cultures.

Otostegia

Otostegia

Otostegia persica

C — Limited EvidenceLamiaceae

Iranian and Baluchistan medicinal shrub used for diabetes, fever, and headache in traditional Baluchi and Persian medicine. Contains iridoid glycosides and flavonoids with demonstrated hypoglycemic activity. Also used as insect repellent.

Ouabain

Ouabain

Strophanthus gratus

T — Traditional UseApocynaceae

Traditional medicinal plant used for poison(arrow).

Ovalleaf Clustervine

Ovalleaf Clustervine

Jacquemontia ovalifolia

T — Traditional UseConvolvulaceae

Native American medicinal plant used as dermatological aid, pediatric aid, strengthener. Documented among Hawaiian.

Overnight Oats

Overnight Oats

Avena sativa (soaked)

B — Good EvidencePoaceae

Oats soaked overnight in milk/yogurt with chia seeds — the most popular functional breakfast. Provides beta-glucan fiber for cholesterol and gut health. No cooking needed.

Oxeyedaisy

Oxeyedaisy

Leucanthemum vulgare

T — Traditional UseAsteraceae

Native American medicinal plant used as eye medicine, febrifuge, tonic, dermatological aid. Documented among Iroquois, Menominee, Mohegan.

Ox-Eye Daisy

Ox-Eye Daisy

Leucanthemum vulgare

T — Traditional UseAsteraceae

European folk remedy for whooping cough, asthma, and as a wound wash; used similarly to chamomile in rural traditions.

Pacific Anemone

Pacific Anemone

Pulsatilla patens

T — Traditional UseRanunculaceae

Native American medicinal plant used as abortifacient, analgesic, dermatological aid, gynecological aid, cold remedy, panacea. Documented among Blackfoot, Carrier, Southern, Cheyenne.

Pacific Blacksnakeroot

Pacific Blacksnakeroot

Sanicula crassicaulis

T — Traditional UseApiaceae

Native American medicinal plant used as dermatological aid, snake bite remedy. Documented among Miwok.

Pacific Bleedinghearts

Pacific Bleedinghearts

Dicentra formosa

T — Traditional UsePapaveraceae

Native American medicinal plant used as anthelmintic, dermatological aid, toothache remedy. Documented among Skagit.

Pacific Dewberry

Pacific Dewberry

Rubus vitifolius

T — Traditional UseRosaceae

Native American medicinal plant used as antidiarrheal, dermatological aid, disinfectant. Documented among Costanoan, Mendocino Indian.

Pacific Dogwood

Pacific Dogwood

Cornus nuttallii

T — Traditional UseCornaceae

Native American medicinal plant used as cathartic, emetic, tonic, herbal steam, laxative, blood medicine. Documented among Green River Group, Hoh, Karok.

Pacific Hemlockparsley

Pacific Hemlockparsley

Conioselinum gmelinii

T — Traditional UseApiaceae

Native American medicinal plant used as cold remedy, throat aid, antirheumatic (external), herbal steam, stimulant. Documented among Aleut, Kwakiutl.

Pacific Hound's Tongue

Pacific Hound's Tongue

Cynoglossum grande

T — Traditional UseBoraginaceae

Native American medicinal plant used as burn dressing, gastrointestinal aid, venereal aid. Documented among Concow, Pomo, Potter Valley.

Pacific Madrone

Pacific Madrone

Arbutus menziesii

T — Traditional UseEricaceae

Native American medicinal plant used as gastrointestinal aid, emetic, burn dressing, dermatological aid, misc. disease remedy, ceremonial medicine. Documented among Cahuilla, Concow, Cowichan.

Pacific Monardella

Pacific Monardella

Monardella odoratissima

T — Traditional UseLamiaceae

Native American medicinal plant used as diaphoretic, love medicine, cold remedy, febrifuge, pediatric aid, analgesic. Documented among Karok, Miwok, Okanagan-Colville.

Pacific Ninebark

Pacific Ninebark

Physocarpus capitatus

T — Traditional UseRosaceae

Native American medicinal plant used as emetic, antidote, antirheumatic (external), antirheumatic (internal), laxative, cathartic. Documented among Bella Coola, Green River Group, Hesquiat.

Pacific Oakfern

Pacific Oakfern

Gymnocarpium disjunctum

T — Traditional UseDryopteridaceae

Native American medicinal plant used as other. Documented among Abnaki.

Pacific Peavine

Pacific Peavine

Lathyrus vestitus

T — Traditional UseFabaceae

Native American medicinal plant used as emetic, panacea. Documented among Costanoan.

Pacific Poison Oak

Pacific Poison Oak

Toxicodendron diversilobum

T — Traditional UseAnacardiaceae

Native American medicinal plant used as eye medicine, contraceptive, poison, preventive medicine, dermatological aid, antidote. Documented among Diegueno, Karok, Mahuna.

Pacific Rhododendron

Pacific Rhododendron

Rhododendron macrophyllum

T — Traditional UseEricaceae

Native American medicinal plant used as ceremonial medicine. Documented among Karok.

Pacific Serviceberry

Pacific Serviceberry

Amelanchier alnifolia

T — Traditional UseRosaceae

Native American medicinal plant used as venereal aid. Documented among Bella Coola.

Pacific Silver Fir

Pacific Silver Fir

Abies amabilis

T — Traditional UsePinaceae

Native American medicinal plant used as eye medicine, gastrointestinal aid, throat aid, tuberculosis remedy, tonic, hemorrhoid remedy. Documented among Bella Coola, Haisla, Hanaksiala.

Pacific Stonecrop

Pacific Stonecrop

Sedum divergens

T — Traditional UseCrassulaceae

Native American medicinal plant used as hemorrhoid remedy, laxative, pediatric aid. Documented among Okanagon, Thompson.

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