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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

Old Man's Beard Lichen

Old Man's Beard Lichen

Usnea longissima

T — Traditional UseUsneaceae

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

Old Man's Whiskers

Old Man's Whiskers

Geum triflorum

T — Traditional UseRosaceae

Native American medicinal plant used as blood medicine, eye medicine, gastrointestinal aid, stimulant, veterinary aid. Documented among Blackfoot, Chippewa, Paiute.

Olive Leaf Capsule

Olive Leaf Capsule

Olea europaea (500mg)

C — Limited EvidenceOleaceae

Standard olive leaf extract capsule — 500mg standardized to 18-20% oleuropein. For immune, cardiovascular, and blood sugar support. 1-2 capsules twice daily.

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.

Omega-3 Fish Oil

Omega-3 Fish Oil

EPA/DHA from fish

A — Strong EvidenceN/A (marine)

EPA and DHA omega-3 fatty acids from fish — among the most evidence-based supplements worldwide. Essential for brain, heart, joint, and eye health.

Oneflower Bedstraw

Oneflower Bedstraw

Galium uniflorum

T — Traditional UseRubiaceae

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

Oneseed Burr Cucumber

Oneseed Burr Cucumber

Sicyos angulatus

T — Traditional UseCucurbitaceae

Native American medicinal plant used as venereal aid, veterinary aid. Documented among Iroquois.

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.

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 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 Bush Monkeyflower

Orange Bush Monkeyflower

Diplacus aurantiacus

T — Traditional UseOrobanchaceae

Native American medicinal plant used as gastrointestinal aid. Documented among Tubatulabal.

Orange Gooseberry

Orange Gooseberry

Ribes pinetorum

T — Traditional UseGrossulariaceae

Native American medicinal plant used as ceremonial medicine, emetic. Documented among Navajo, Ramah.

Orangegrass

Orangegrass

Hypericum gentianoides

T — Traditional UseHypericaceae

Native American medicinal plant used as abortifacient, antidiarrheal, dermatological aid, febrifuge, gastrointestinal aid, hemostat. Documented among Cherokee.

Orange Honeysuckle

Orange Honeysuckle

Lonicera ciliosa

T — Traditional UseCaprifoliaceae

Native American medicinal plant used as contraceptive, dermatological aid, tuberculosis remedy, tonic, gynecological aid, cold remedy. Documented among Chehalis, Klallam, Lummi.

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 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.

Oregon Ash

Oregon Ash

Fraxinus latifolia

T — Traditional UseOleaceae

Native American medicinal plant used as febrifuge, snake bite remedy, anthelmintic, preventive medicine, dermatological aid. Documented among Costanoan, Cowlitz, Karok.

Oregon Drops Of Gold

Oregon Drops Of Gold

Prosartes hookeri

T — Traditional UseNartheciaceae

Native American medicinal plant used as poison, love medicine. Documented among Klallam, Makah.

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.

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.

Orris

Orris

Iris x germanica

T — Traditional UseIridaceae

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

Osage-Orange

Osage-Orange

Maclura pomifera

T — Traditional UseMoraceae

Traditional medicinal plant used for cardiac, collyrium, poison, stimulant, tenderizer, wart.

Osha

Osha

Ligusticum porteri

T — Traditional UseApiaceae

A sacred Native American herb from the Rocky Mountains used for respiratory support, sore throat, and as a first-line immune herb. Difficult to cultivate.

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.

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.

Owlsclaws

Owlsclaws

Hymenoxys hoopesii

T — Traditional UseAsteraceae

Native American medicinal plant used as analgesic, respiratory aid, antiemetic. Documented among Great Basin Indian, Navajo.

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.

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 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 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 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.

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.

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