Plant Comparison

Tea vs Black Cumin

A side-by-side comparison of two medicinal plants — every documented constituent, action, use, safety note and cited source, assembled automatically from the Omnia Sana database.

First plant

Second plant

Plant ATeaCamellia sinensisTheaceaeFull monograph →

Plant BBlack CuminNigella sativaRanunculaceaeFull monograph →

At a glance

Tea and Black Cumin: they share 8 indicated uses (arthritis / joint pain, blood sugar / diabetes support, cancer (anticancer research), …); 5 pharmacological actions in common.

TeaBlack Cumin

Constituents35

Pharmacological actions69

Indicated uses1117

Safety notes22

Cited sources2124

Indicated uses

Only Tea

Cardiovascular / heart healthCognitive functionMemory

Shared (8)

Arthritis / joint painBlood sugar / diabetes supportCancer (anticancer research)Infection (general)Inflammation (general)Metabolic supportSkin irritationWounds

Only Black Cumin

Acid refluxBack painBloatingCold & fluHeadacheImmune supportIndigestionPain (general)Respiratory support

Pharmacological actions

Only Tea

Neuroprotective / cognition support

Shared (5)

Anti-inflammatoryAnticancer (preclinical)Antidiabetic (blood-sugar lowering)AntimicrobialAntioxidant

Only Black Cumin

Analgesic (pain relief)Digestive aidGastroprotectiveImmunomodulator / immune support

Evidence face-off — shared uses

Condition	Tea	Black Cumin	Verdict
Arthritis / joint pain	1/10	5/10	Stronger for Black Cumin
Blood sugar / diabetes support	1/10	5/10	Stronger for Black Cumin
Cancer (anticancer research)	8/10	7/10	Comparable evidence
Infection (general)	1/10	5/10	Stronger for Black Cumin
Inflammation (general)	1/10	5/10	Stronger for Black Cumin
Metabolic support	1/10	5/10	Stronger for Black Cumin
Skin irritation	1/10	5/10	Stronger for Black Cumin
Wounds	1/10	5/10	Stronger for Black Cumin

Evidence scores (1–10) are computed from the tier of each cited source. “Comparable” means the two scores are within one point. Follow a score to its detailed sources.

Key Constituents

Catechins (EGCG, ECG) and polyphenols^{[1, 15]}

Principal antioxidant polyphenols, most concentrated in minimally oxidised green tea; epigallocatechin gallate (EGCG) is the best studied.

CatechinsPhenolic compounds

Caffeine and theanine^[1]

Caffeine gives tea its mild stimulant effect; L-theanine, a unique amino acid, is associated with calm alertness and modulates caffeine's effects.

Caffeine

Theaflavins and thearubigins^[15]

Oxidative polymerisation products of catechins formed during black tea processing, contributing to black tea's colour and its own antioxidant profile.

Thymoquinone^{[3, 9]}

The principal bioactive constituent of the seed oil, responsible for much of its anti-inflammatory, antioxidant and antimicrobial activity.

Volatile oil (nigellone, thymol, carvacrol)^[3]

The aromatic fraction of the seed, contributing antimicrobial and antioxidant activity.

Essential (volatile) oilThymolCarvacrol

Fixed oil (linoleic acid, oleic acid)^[1]

The bulk lipid fraction of the seed (roughly a third of seed weight by weight), the carrier for the fat-soluble thymoquinone.

Alkaloids (nigellicine, nigellidine)^[1]

Minor isoquinoline-type alkaloids studied for antioxidant activity.

Alkaloids

Saponins (alpha-hederin)^[1]

Triterpene saponin studied for anticancer and antiparasitic activity.

Saponins

Pharmacological Actions

Anti-inflammatory^[15]

Anticancer (preclinical)^{[4, 5, 9, 15]}

Antidiabetic (blood-sugar lowering)^[15]

Antimicrobial^{[8, 11, 12, 15]}

Antioxidant^{[4, 6, 10, 15]}

Neuroprotective / cognition support^{[6, 15]}

Analgesic (pain relief)^{[6, 12, 13, 14, 15, 16, 17, 18]}

Anti-inflammatory^{[1, 2, 4, 8, 9, 10, 12, 13, 14, 15, 16, 17, 18]}

Anticancer (preclinical)^{[7, 12, 13, 14, 15, 16, 17, 18]}

Antidiabetic (blood-sugar lowering)^{[5, 12, 13, 14, 15, 16, 17, 18]}

Antimicrobial^{[3, 11, 12, 13, 14, 15, 16, 17, 18]}

Antioxidant^{[1, 3, 8, 12, 13, 14, 15, 16, 17, 18]}

Digestive aid^{[12, 13, 14, 15, 16, 17, 18]}

Gastroprotective^{[12, 13, 14, 15, 16, 17, 18]}

Immunomodulator / immune support^{[4, 12, 13, 14, 15, 16, 17, 18]}

Traditional & Indicated Uses

Arthritis / joint pain^[15]Traditional · 1/10

inferred from anti-inflammatory action

Evidence: 1

Label: Arthritis / joint pain

Blood sugar / diabetes support^{[15, 17]}Traditional · 1/10

inferred from antidiabetic action

Evidence: 1

Label: Blood sugar / diabetes support

Cancer (anticancer research)^{[5, 9]}Good · 8/10

inferred from anticancer action

Evidence: 8

Label: Cancer (anticancer research)

Cardiovascular / heart health^{[15, 17]}Traditional · 1/10

Evidence: 1

Label: Cardiovascular / heart health

Cognitive function^{[15, 18]}Traditional · 1/10

inferred from neuroprotective action

Evidence: 1

Label: Cognitive function

Infection (general)^[15]Traditional · 1/10

inferred from antimicrobial action

Evidence: 1

Label: Infection (general)

Inflammation (general)^[15]Traditional · 1/10

inferred from anti-inflammatory action

Evidence: 1

Label: Inflammation (general)

Memory^{[15, 18]}Traditional · 1/10

inferred from neuroprotective action

Evidence: 1

Label: Memory

Metabolic support^{[15, 17]}Traditional · 1/10

Evidence: 1

Label: Metabolic support

Skin irritation^[15]Traditional · 1/10

inferred from anti-inflammatory action

Evidence: 1

Label: Skin irritation

Wounds^[15]Traditional · 1/10

inferred from antimicrobial action

Evidence: 1

Label: Wounds

Acid reflux^{[12, 13, 14, 15, 16, 17, 18]}Moderate · 5/10

inferred from gastroprotective action

Evidence: 5

Label: Acid reflux

Arthritis / joint pain^{[12, 13, 14, 15, 16, 17, 18]}Moderate · 5/10

inferred from anti-inflammatory action

Evidence: 5

Label: Arthritis / joint pain

Back pain^{[12, 13, 14, 15, 16, 17, 18]}Moderate · 5/10

inferred from analgesic action

Evidence: 5

Label: Back pain

Bloating^{[12, 13, 14, 15, 16, 17, 18]}Moderate · 5/10

inferred from digestive action

Evidence: 5

Label: Bloating

Blood sugar / diabetes support^{[12, 13, 14, 15, 16, 17, 18]}Moderate · 5/10

inferred from antidiabetic action

Evidence: 5

Label: Blood sugar / diabetes support

Cancer (anticancer research)^[7]Good · 7/10

inferred from anticancer action

Evidence: 7

Label: Cancer (anticancer research)

Cold & flu^{[12, 13, 14, 15, 16, 17, 18]}Moderate · 5/10

inferred from immunomodulator action

Evidence: 5

Label: Cold & flu

Headache^{[12, 13, 14, 15, 16, 17, 18]}Moderate · 5/10

inferred from analgesic action

Evidence: 5

Label: Headache

Immune support^{[12, 13, 14, 15, 16, 17, 18]}Moderate · 5/10

Evidence: 5

Label: Immune support

Indigestion^{[12, 13, 14, 15, 16, 17, 18]}Moderate · 5/10

inferred from digestive action

Evidence: 5

Label: Indigestion

Infection (general)^{[12, 13, 14, 15, 16, 17, 18]}Moderate · 5/10

inferred from antimicrobial action

Evidence: 5

Label: Infection (general)

Inflammation (general)^{[12, 13, 14, 15, 16, 17, 18]}Moderate · 5/10

inferred from anti-inflammatory action

Evidence: 5

Label: Inflammation (general)

Metabolic support^{[12, 13, 14, 15, 16, 17, 18]}Moderate · 5/10

inferred from antidiabetic action

Evidence: 5

Label: Metabolic support

Pain (general)^{[12, 13, 14, 15, 16, 17, 18]}Moderate · 5/10

Evidence: 5

Label: Pain (general)

Respiratory support^{[12, 13, 14, 15, 16, 17, 18]}Moderate · 5/10

Evidence: 5

Label: Respiratory support

Skin irritation^{[12, 13, 14, 15, 16, 17, 18]}Moderate · 5/10

inferred from anti-inflammatory action

Evidence: 5

Label: Skin irritation

Wounds^{[12, 13, 14, 15, 16, 17, 18]}Moderate · 5/10

inferred from antimicrobial action

Evidence: 5

Label: Wounds

Safety, Cautions & Contraindications

Safety note^{[15, 17, 18]}Serious

Generally safe in moderate consumption. High caffeine intake may cause insomnia, anxiety, palpitations, or dependence. Large amounts of green tea extract supplements may be hepatotoxic (rare). May reduce iron absorption if consumed with meals. Avoid very high supplement doses during pregnancy.

Safety note^{[15, 17, 18, 19]}Caution

Duke (2002) rates tea (Camellia sinensis) as ++ and notes anti-aggregant, antioxidant, anticariogenic, and antibacterial activities at the experimental level (score 1). The catechins (EGCG, ECG) and polyphenols are responsible for the antioxidant and anticancer properties under research investigation. Duke notes that green tea preserves more polyphenols than black tea due to less oxidation. Regular tea consumption is associated with reduced cardiovascular risk. Excess consumption (>10 cups daily) may cause fluoride-related bone changes. Caffeine content is relevant for sleep disturbance, anxiety, and interactions with cardiovascular medications (Duke, 2002).

Safety note^{[12, 13, 14, 15, 16, 17, 18]}Caution

Generally well-tolerated in clinical trials at doses up to 200 mg/day of oil for 90 days. Potential side effects may include mild gastrointestinal discomfort. Contraindicated during pregnancy due to potential uterine stimulant effects. May interact with immunosuppressants and antidiabetic medications. Allergic reactions possible in sensitive individuals. Consult healthcare provider before use, especially with concurrent medications.

Safety note^{[12, 13, 14, 15, 16, 17, 18, 19]}Caution

Duke (2002) describes black cumin (Nigella sativa) as one of the most multi-active medicinal spices, with experimental evidence for bronchodilation, immunostimulation, hepatoprotection, and antihistaminic activity. The prophet Muhammad reportedly described it as 'a cure for all things except death.' Key bioactive compounds include thymoquinone and nigellone. Antihistaminic and bronchodilatory activity supports its traditional use in asthma and allergic conditions. Duke notes it is generally safe at culinary amounts but recommends caution with medicinal doses in pregnancy due to potential uterotonic effects (Duke, 2002).

External Ids

Gbif: 3189635

Wikidata: Q101815

Gbif: 5371700

Wikidata: Q160575

Botanical Description

Evergreen shrub or small tree with glossy, dark green, leathery, finely toothed leaves. Small, fragrant, white flowers with a prominent central boss of yellow stamens are borne singly or in small clusters in the leaf axils. Commercial tea is made from the young leaves and unopened leaf buds ('sprouts'), processed differently to yield green, black, white or oolong tea from the same species.^[15]

Height: 1-9 m (kept pruned to 1-1.5 m under cultivation)

Habit: Evergreen shrub or small tree, usually kept pruned as a shrub

Leaves: Glossy, dark green, leathery, finely toothed

Flowers: Small, fragrant, white, with a prominent boss of yellow stamens

Stem: Woody, branching, evergreen

Root: Deep taproot

Fruit: Woody capsule containing a few large seeds

Flowering Period: Autumn to winter

Annual herb (Ranunculaceae), 20-90 cm tall, with an erect, branched stem and finely divided, pinnately dissected, fern-like leaves. Delicate pale blue-white (occasionally pale purple) flowers, each with 5-10 petal-like sepals, are surrounded by a feathery bract collar. The fruit is an inflated, many-celled capsule that dries and splits to release numerous small, black, angular seeds - the medicinal part.^[1]

Height: 20-90 cm

Habit: Erect, branched annual herb

Leaves: Finely pinnately dissected, fern-like

Flowers: Pale blue-white (occasionally pale purple), 5-10 petal-like sepals, feathery bract collar

Stem: Erect, branched

Root: Slender taproot

Fruit: Inflated capsule splitting to release small black angular seeds

Flowering Period: June-August

Habitat

Native to the subtropical and tropical forests and hillsides of East and South Asia (China, India, Myanmar); cultivated extensively across Asia, Africa and elsewhere on well-drained, acidic upland soils.^[15]

Native to the Mediterranean basin, southern Europe, western Asia and North Africa, and widely cultivated as a spice and medicinal crop across the Middle East, South Asia and North Africa; grows in cultivated fields and on disturbed ground.^[1]

Harvesting

The youngest leaves and unopened leaf buds ('flush') are hand- or machine-picked repeatedly through the growing season; how the fresh leaf is subsequently processed (withered, rolled, oxidised, fixed and dried) determines whether it becomes green, black, white or oolong tea.^[15]

Parts: Leaf, Young sprouts

Season: Repeated flushes through the growing season

Seed capsules are harvested once dried and brown (late summer), then threshed to release the small black seeds. Seed is stored whole and either used directly or cold-pressed for oil shortly before use to preserve the volatile thymoquinone-rich fraction.^[1]

Parts: Seed

Season: Late summer, once capsules have dried

Traditional Uses

Tea has an ancient East Asian tradition as both a beverage and a medicinal tonic, used for alertness, digestion and general wellbeing; green tea in particular has a long-standing reputation, now widely studied, as an antioxidant, cardiometabolic and cognitive-support beverage.^{[1, 15]}

One of the most celebrated medicinal seeds in Middle Eastern and Islamic traditional medicine - known as 'Habbatul Barakah' (the blessed seed) - black seed has traditionally been used for digestive complaints, respiratory conditions (asthma, cough), pain, inflammation, skin conditions and as a general tonic. Modern research on its principal constituent thymoquinone supports broad anti-inflammatory, antioxidant, antimicrobial, antidiabetic and immunomodulatory activity.^{[1, 2, 9]}

Preparations

Infusion (green tea)^[15]

Young leaf, minimally oxidised, infused in hot water; the least-processed and most-studied form for antioxidant polyphenol content.

Standardised extract^[15]

Concentrated leaf extract standardised to catechin (e.g. EGCG) content, taken as capsules; used in some clinical studies, though high-dose extracts carry rare hepatotoxicity concerns.

Whole or ground seed^[1]

Seed eaten directly, sprinkled on food, or ground into a paste - the traditional culinary-medicinal form.

Cold-pressed seed oil^{[3, 9]}

The form most used in clinical trials, taken orally in capsules or as a liquid.

Dosage

Infusion^[16]

The EU herbal monograph on green tea leaf (Camelliae sinensis non fermentatum folium) gives, for adults and elderly, 1.8-2.2 g of the whole or comminuted leaf in 100-150 mL of boiling water as an infusion, 3-5 times daily; a powdered herbal substance at 390 mg three times daily (up to 5 if necessary) is also listed. Contraindicated in gastric and duodenal ulcers, cardiovascular disorders such as hypertension and arrhythmia, and hyperthyroidism. Not recommended under 18 years. Educational reference only, not a prescription.

Seed oil^{[12, 13, 14, 15, 16, 17, 18]}

Clinical trials have generally been well tolerated at doses up to about 200 mg/day of oil taken for up to 90 days. Educational reference only, not a prescription; avoid medicinal doses in pregnancy.

References

REF-0755, REF-0756, REF-0757, REF-1960, REF-1961, REF-1962, REF-1963, REF-1964, REF-1965, REF-1966, REF-1967, REF-1968, REF-1969, REF-1970

REF-2065, REF-2066, REF-2067, REF-2068, REF-2069, REF-2070, REF-2071, REF-2072, REF-2073, REF-2074, REF-2075

Drug Class Interactions

Safety note^{[20, 21]}Caution

Drug Class: antihypertensives

Mechanism: Green tea catechins block an intestinal uptake transporter (OATP1A2) that some blood-pressure medicines rely on for absorption. In a controlled study, drinking green tea cut blood levels of the beta-blocker nadolol by about 85% and blunted its blood-pressure-lowering effect. If you take nadolol (or other OATP-transported medicines), separate green tea from the dose by several hours and keep intake consistent; watch that your blood pressure stays controlled.

Reviewed By: Omnia Sana (owner-authorized)

Reviewed Date: 2026-07-03

Safety note^{[20, 21, 22]}Caution

Drug Class: antidiabetics

Mechanism: Black seed (Nigella sativa) lowers fasting blood glucose and HbA1c in trials in people with prediabetes and type 2 diabetes (confirmed by meta-analysis); combined with diabetes medicines it may add to blood-sugar lowering, so monitor blood sugar.

Reviewed By: Omnia Sana (owner-authorized)

Reviewed Date: 2026-07-03

Safety note^{[23, 24]}Caution

Drug Class: antihypertensives

Mechanism: Black seed (Nigella sativa) modestly lowers blood pressure - two meta-analyses of randomised trials found reductions of roughly 3 mmHg systolic and 3 mmHg diastolic. Combined with blood-pressure medicines it may add to their effect, so monitor your blood pressure.

Reviewed By: Omnia Sana (owner-authorized)

Reviewed Date: 2026-07-03

Lookalikes Review

Outcome: none-known

Reviewed By: Omnia Sana (owner-authorized)

Reviewed Date: 2026-07-07

Outcome: none-known

Reviewed By: Omnia Sana (owner-authorized)

Reviewed Date: 2026-07-07

References & Sources

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https://doi.org/10.3390/ijms21051744
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https://doi.org/10.2174/1871523015666160915154443
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https://www.ema.europa.eu/en/documents/herbal-monograph/final-community-herbal-monograph-camellia-sinensis-l-kuntze-non-fermentatum-folium_en.pdf
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https://scholar.google.com/scholar?q=Tea%20catechins%20and%20cardiovascular%20disease%20risk
Nobre, A.C., Rao, A. and Owen, G.N (2008) 'L-theanine, a natural constituent in tea, and its effect on mental state', pp. 167--168. Traditional / reference
https://scholar.google.com/scholar?q=L-theanine%2C%20a%20natural%20constituent%20in%20tea%2C%20and%20its%20effect%20on%20mental%20state
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https://scholar.google.com/scholar?q=Handbook%20of%20Medicinal%20Herbs%2C%20Second%20Edition
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