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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

Nuttall's Sunflower

Nuttall's Sunflower

Helianthus nuttallii

T — Traditional UseAsteraceae

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

Nymphaea Lotus

Nymphaea Lotus

Nymphaea lotus

T — Traditional UseNymphaeaceae

Egyptian and West African water lily used in traditional medicine for diarrhea, diabetes, and as mild sedative. Contains nuciferine and nymphayol. Ancient Egyptian ceremonial plant. Flower tea for relaxation and lucid dreaming in modern herbalism.

Oak Mistletoe

Oak Mistletoe

Phoradendron leucarpum

T — Traditional UseSantalaceae

Native American medicinal plant used as analgesic, anticonvulsive, gynecological aid, hypotensive, love medicine, pulmonary aid. Documented among Cherokee, Creek, Houma.

Oat Milk

Oat Milk

Avena sativa (milk)

B — Good EvidencePoaceae

Plant milk from oats — naturally sweet, creamy, and rich in beta-glucan fiber. Used as a dairy alternative that supports cholesterol and gut health.

Oceanblue Morningglory

Oceanblue Morningglory

Ipomoea indica

T — Traditional UseConvolvulaceae

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

Ochna Serrulata

Ochna Serrulata

Ochna serrulata

T — Traditional UseOchnaceae

Southern African shrub used in Zulu and Swazi traditional medicine for stomach complaints, ulcers, and as emetic. Root preparations for infertility. Contains biflavonoids (lophirone) and tannins. Named for fruit resembling Mickey Mouse face.

Ocotillo

Ocotillo

Fouquieria sp.

T — Traditional UseFouquieriaceae

Native American medicinal plant used as orthopedic aid. Documented among Hualapai.

Oha Leaf

Oha Leaf

Pterocarpus mildbraedii

T — Traditional UseFabaceae

Nigerian Igbo medicinal food for anemia, inflammation, and microbial infections; leaf is eaten in soups and also used therapeutically.

Oil Pulling

Oil Pulling

Cocos nucifera (oral swishing)

C — Limited EvidenceArecaceae

Ayurvedic practice of swishing 1 tbsp coconut/sesame oil for 15-20 minutes. Shown to reduce Streptococcus mutans and plaque. Do NOT swallow — spit into trash.

Olapa

Olapa

Cheirodendron gaudicchaudii

T — Traditional UseAraliaceae

Native American medicinal plant used as respiratory aid. Documented among Hawaiian.

Old Man Saltbush

Old Man Saltbush

Atriplex nummularia

T — Traditional UseChenopodiaceae

Aboriginal food-medicine for skin irritations, insect stings, and as a nutritious mineral supplement. Leaves are high in protein and minerals and were a staple food.

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.

Olea Bark

Olea Bark

Olea europaea subsp. africana

C — Limited EvidenceOleaceae

East African olive bark for malaria, sore throat, and eye infections; leaf tea for hypertension and diabetes.

Oleander

Oleander

Nerium oleander

T — Traditional UseApocynaceae

Traditional medicinal plant used for aposteme, atheroma, carcinoma, cardiac, cardiotonic, corn, cyanogenetic, diuretic, and other conditions. Known from ethnobotanical records across multiple cultures.

Olena

Olena

Curcuma domestica

T — Traditional UseZingiberaceae

Polynesian-introduced turmeric variety used in traditional Hawaiian medicine for ear infections, sinus congestion, and purification rituals. Applied as poultice for skin conditions. Different cultivar from common turmeric with distinct phytochemical profile.

Olive Fruit Extract

Olive Fruit Extract

Olea europaea (fruit extract)

B — Good EvidenceOleaceae

Concentrated olive polyphenols (hydroxytyrosol) — the most potent natural antioxidant measured by ORAC. Provides olive oil benefits without the calories.

Olive Leaf

Olive Leaf

Olea europaea

C — Limited EvidenceOleaceae

The leaves of the olive tree contain oleuropein, studied for cardiovascular support, blood sugar balance, and immune function.

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

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.

Olive Oil

Olive Oil

Olea europaea (oil)

A — Strong EvidenceOleaceae

Extra virgin olive oil — contains oleocanthal (anti-inflammatory) and hydroxytyrosol (antioxidant). The foundation of the Mediterranean diet. Medicinal food.

Ololiuqui

Ololiuqui

Ipomoea violacea

T — Traditional UseConvolvulaceae

Traditional medicinal plant used for psychedelic, psychomimetic.

Olona

Olona

Touchardia latifolia

T — Traditional UseUrticaceae

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

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.

One-Flowered Bugle

One-Flowered Bugle

Lycopus uniflorus

T — Traditional UseLamiaceae

A medicinal plant (Lycopus uniflorus) from the Lamiaceae family used in traditional medicine.

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.

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 Bush Monkeyflower

Orange Bush Monkeyflower

Diplacus aurantiacus

T — Traditional UseOrobanchaceae

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

Orange Coneflower

Orange Coneflower

Rudbeckia fulgida

T — Traditional UseAsteraceae

Native American medicinal plant used as anthelmintic, dermatological aid, ear medicine, gynecological aid, kidney aid, snake bite remedy. 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.

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 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 Crabapple

Oregon Crabapple

Malus fusca

T — Traditional UseRosaceae

Native American medicinal plant used as eye medicine, panacea, antirheumatic (internal), dietary aid, diuretic, laxative. Documented among Bella Coola, Cowichan, Gitksan.

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 Fawnlily

Oregon Fawnlily

Erythronium oregonum

T — Traditional UseNartheciaceae

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

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