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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

Oat Straw

Oat Straw

Avena sativa

C — Limited EvidencePoaceae

A gentle nervine tonic and nutritive herb used for nervous system nourishment, stress support, and bone health.

Oat Straw Tea

Oat Straw Tea

Avena sativa (tea)

C — Limited EvidencePoaceae

Dried oat straw long-infused (4+ hours) — a deeply nourishing nervous system tonic rich in calcium, magnesium, and silica. One of the safest daily tonics.

Obtuse Panicgrass

Obtuse Panicgrass

Panicum obtusum

T — Traditional UsePoaceae

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

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.

Oceanspray

Oceanspray

Holodiscus discolor

T — Traditional UseRosaceae

Native American medicinal plant used as misc. disease remedy, antidiarrheal, eye medicine, oral aid, orthopedic aid, tonic. Documented among Chehalis, Lummi, Makah.

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.

Ocotea

Ocotea

Ocotea glaziovii

T — Traditional UseLauraceae

A medicinal plant (Ocotea glaziovii) from the Lauraceae family used in traditional medicine.

Ocotillo

Ocotillo

Fouquieria sp.

T — Traditional UseFouquieriaceae

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

Ogapi

Ogapi

Eleutherococcus sessiliflorus

C — Limited EvidenceAraliaceae

Korean adaptogenic herb for fatigue, joint pain, and immune support. Different species from Siberian ginseng but used similarly in Korean traditional medicine.

Ogugu

Ogugu

Ficus exasperata

T — Traditional UseMoraceae

West African rough-leaf tree for hypertension, diabetes, and dysentery; rough leaves used to polish and also for wound dressing.

Ogun Eje

Ogun Eje

Jatropha multifida

T — Traditional UseEuphorbiaceae

West African and Caribbean wound-healing plant; leaf latex applied to fresh cuts; bark decoction for infections. Toxic internally.

Ogyeop-song

Ogyeop-song

Pinus koraiensis

C — Limited EvidencePinaceae

Korean pine nut and needle preparation used for respiratory conditions, fatigue, and nutritional support. Pine nut oil is rich in pinolenic acid for appetite control.

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.

'oha Wai Nui

'oha Wai Nui

Clermontia arborescens

T — Traditional UseCampanulaceae

Native American medicinal plant used as breast treatment, dermatological aid, respiratory aid. Documented among Hawaiian.

'ohi'a

'ohi'a

Metrosideros polymorpha

T — Traditional UseMyrtaceae

Native American medicinal plant used as analgesic. Documented among Hawaiian.

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.

Oiticica

Oiticica

Licania rigida

T — Traditional UseChrysobalanaceae

A medicinal plant (Licania rigida) from the Chrysobalanaceae family used in traditional medicine.

Okoubaka

Okoubaka

Okoubaka aubrevillei

T — Traditional UseSantalaceae

West African tree used by traditional healers as a universal detoxifier and antidote to food poisoning. Popular in German homeopathy for travel sickness and food intolerances.

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 + D3

Omega-3 + D3

Fish oil + Cholecalciferol

A — Strong EvidenceN/A (formula)

Fish oil combined with vitamin D3 — the two most universally recommended supplements. D3 is fat-soluble so fish oil is the perfect carrier. Convenient 2-in-1.

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.

Omega-3 Vegan

Omega-3 Vegan

Schizochytrium sp. (algae DHA+EPA)

A — Strong EvidenceN/A (algae)

DHA+EPA from microalgae — the vegan omega-3 source. Where fish get their omega-3 (from eating algae). No ocean contaminants. 250-500mg DHA+EPA daily.

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.

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.

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.

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.

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