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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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Evidence-Based

Olive Leaf Extract

Olive Leaf Extract

Olea europaea (extract)

C — Limited EvidenceOleaceae

Standardized extract of olive leaf containing oleuropein. Used for immune support, blood pressure, blood sugar, and cardiovascular health.

Olive Leaf Extract Standardized

Olive Leaf Extract Standardized

Olea europaea (18-25% oleuropein)

B — Good EvidenceOleaceae

Standardized olive leaf — 18-25% oleuropein. Broad-spectrum antimicrobial for colds, flu, and chronic infections. Also lowers blood pressure and blood sugar. Herxheimer (die-off) reactions common when starting — start low. More potent than eating olives.

Olive Leaf Tea

Olive Leaf Tea

Olea europaea (leaf tea)

C — Limited EvidenceOleaceae

Simple olive leaf tea — milder than extract but still provides oleuropein. Pleasant mild bitter-green taste. Traditional Mediterranean remedy for immune and cardiovascular support.

Olive Leaf Tincture

Olive Leaf Tincture

Olea europaea (tincture)

C — Limited EvidenceOleaceae

Alcohol-extracted olive leaf — faster absorption than capsules. 30-60 drops 2-3x daily. For immune, cardiovascular, and antimicrobial support.

Oneflower Bedstraw

Oneflower Bedstraw

Galium uniflorum

T — Traditional UseRubiaceae

Native American medicinal plant used as dermatological aid, diaphoretic, diuretic. Documented among Choctaw.

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.

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.

Oolong Tea

Oolong Tea

Camellia sinensis (partially oxidized)

B — Good EvidenceTheaceae

Partially oxidized tea (between green and black). Contains unique polymerized polyphenols. Studied for weight management, blood sugar, and dental health. Moderate caffeine.

Openflower Rosette Grass

Openflower Rosette Grass

Dichanthelium laxiflorum

T — Traditional UsePoaceae

Native American medicinal plant used as analgesic, antirheumatic (external), cough medicine, pulmonary aid, throat aid. Documented among Seminole.

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 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.

Ordeal Tree

Ordeal Tree

Erythrophleum suaveolens

T — Traditional UseFabaceae

Traditional medicinal plant used for ache(head), anodyne, astringent, bite(snake), cardiotonic, cathartic, chest, chickenpox, and other conditions. Known from ethnobotanical records across multiple cultures.

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 Tea

Oregano Tea

Origanum vulgare (tea)

C — Limited EvidenceLamiaceae

Dried oregano steeped as tea — milder than oil but still antimicrobial. Traditional Mediterranean and Mexican cold/flu remedy. Pleasant savory-herbal taste.

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 Grape Extract

Oregon Grape Extract

Mahonia aquifolium (extract)

B — Good EvidenceBerberidaceae

Standardized for berberine content. Used internally for metabolic health and topically (cream) for psoriasis — clinical evidence for mild-moderate psoriasis.

Oregon Grape Root

Oregon Grape Root

Mahonia aquifolium

C — Limited EvidenceBerberidaceae

A berberine-containing herb used for skin conditions (topically for psoriasis), liver support, and digestive health. Sustainable alternative to Goldenseal.

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.

Orosped Thyme

Orosped Thyme

Thymus orospedanus

T — Traditional UseLamiaceae

A medicinal plant (Thymus orospedanus) from the Lamiaceae family used in traditional medicine.

Osha Root

Osha Root

Ligusticum porteri

C — Limited EvidenceApiaceae

Rocky Mountain respiratory powerhouse — Native American cold/flu remedy. For upper respiratory infections, sore throats, and altitude sickness. Bears dig it up after hibernation (hence "Bear Root"). Endangered — never wildcrafted.

Osmanthus

Osmanthus

Osmanthus fragrans

T — Traditional UseOleaceae

A Chinese flower tea with sweet apricot-like flavor. Used for lung health, skin beauty, and digestive comfort. Traditionally reduces phlegm.

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.

Ovalleaf Clustervine

Ovalleaf Clustervine

Jacquemontia ovalifolia

T — Traditional UseConvolvulaceae

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

Ovalleaf Knotweed

Ovalleaf Knotweed

Polygonum arenastrum

T — Traditional UsePolygonaceae

Native American medicinal plant used as gynecological aid, love medicine, orthopedic aid, veterinary aid. Documented among Iroquois.

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.

Oyster Mushroom

Oyster Mushroom

Pleurotus ostreatus

C — Limited EvidencePleurotaceae

A widely cultivated mushroom with natural statin-like compounds (lovastatin). Studied for cholesterol, blood sugar, and immune support.

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 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 Stonecrop

Pacific Stonecrop

Sedum divergens

T — Traditional UseCrassulaceae

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

Pacific Trillium

Pacific Trillium

Trillium ovatum

T — Traditional UseNartheciaceae

Native American medicinal plant used as dermatological aid, eye medicine, love medicine, poison. Documented among Karok, Lummi, Makah.

Painted Trillium

Painted Trillium

Trillium undulatum

T — Traditional UseNartheciaceae

Native American medicinal plant used as gynecological aid. Documented among Algonquin, Tete-de-Boule.

Paiute Cypress

Paiute Cypress

Cupressus arizonica

T — Traditional UseCupressaceae

Native American medicinal plant used as analgesic, cold remedy, cough medicine, gynecological aid, kidney aid, orthopedic aid. Documented among Kawaiisu.

Paiute False Bindweed

Paiute False Bindweed

Calystegia longipes

T — Traditional UseConvolvulaceae

Native American medicinal plant used as venereal aid. Documented among Kawaiisu.

Pakistani Ephedra

Pakistani Ephedra

Ephedra gerardiana

T — Traditional UseEphedraceae

Traditional medicinal plant used for asthma, cardiotonic, circulation-tonic, hypotensive.

Pale Bastard Toadflax

Pale Bastard Toadflax

Comandra umbellata

T — Traditional UseSantalaceae

Native American medicinal plant used as dermatological aid, eye medicine, narcotic, oral aid, analgesic. Documented among Navajo, Navajo, Kayenta, Thompson.

Pale St. Johnswort

Pale St. Johnswort

Hypericum ellipticum

T — Traditional UseHypericaceae

Native American medicinal plant used as abortifacient. Documented among Iroquois.

Pale Thistle

Pale Thistle

Cirsium pallidum

T — Traditional UseAsteraceae

Native American medicinal plant used as diuretic. Documented among Keres, Western.

Pale Touchmenot

Pale Touchmenot

Impatiens pallida

T — Traditional UseBalsaminaceae

Native American medicinal plant used as ceremonial medicine, dermatological aid, gastrointestinal aid, gynecological aid, misc. disease remedy, pediatric aid. Documented among Cherokee, Iroquois, Ojibwa.

Pallas' Buttercup

Pallas' Buttercup

Ranunculus pallasii

T — Traditional UseRanunculaceae

Native American medicinal plant used as poison. Documented among Eskimo, Inupiat.

Pallid Hoptree

Pallid Hoptree

Ptelea trifoliata

T — Traditional UseRutaceae

Native American medicinal plant used as gastrointestinal aid, pediatric aid, poison. Documented among Havasupai.

Pallid Silktassel

Pallid Silktassel

Garrya flavescens

T — Traditional UseGarryaceae

Native American medicinal plant used as cold remedy, gastrointestinal aid, laxative, venereal aid. Documented among Kawaiisu.

Palmer's Heathgoldenrod

Palmer's Heathgoldenrod

Ericameria palmeri

T — Traditional UseAsteraceae

Native American medicinal plant used as dermatological aid, throat aid, analgesic, orthopedic aid. Documented among Cahuilla, Coahuilla.

Palmer's Penstemon

Palmer's Penstemon

Penstemon palmeri

T — Traditional UseOrobanchaceae

Native American medicinal plant used as snake bite remedy. Documented among Navajo, Kayenta.

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