Black Seed

Chinese
黑种草
Pinyin
Hei Zhong Cao
Latin
Semen Nigellae

TCM Properties

Taste
acrid, bitter
Temperature
warm
Channels
Lung, Spleen, Kidney

Traditional Use

Primary Actions

  • Warms and supports the Lung and middle burner - in modern integrative East-West herbal practice, black seed is used for wheezing, damp-cold digestion, and inflammatory respiratory patterns.
  • Supports metabolic balance - it has become a prominent contemporary herb for blood sugar, lipids, and cardiometabolic resilience.
  • Modulates inflammatory reactivity - modern herbal use extends to joint symptoms, immune over-reactivity, and chronic low-grade inflammation.

Secondary Actions

  • Hei Zhong Cao is not part of the core classical Chinese materia medica canon, so its TCM property assignment is a modern integrative mapping.
  • Food spice use, pressed black seed oil, and concentrated extracts differ substantially in potency and safety.

Classic Formulas

  • No major classical TCM formula centers on Hei Zhong Cao because Nigella sativa entered Chinese-style practice mainly through modern integrative herbal medicine rather than through the early canon.
  • Its functional analogue is the family of warming aromatic seeds that support the Lung and digestion while reducing phlegm and cold.
  • Current use is more often in capsules, oils, and cross-tradition formulas than in fixed classical decoctions.

Classical References

  • IMPORT NOTE: Nigella sativa is better known from Middle Eastern, South Asian, and European traditions than from the classical Chinese materia medica.
  • The channels and properties assigned here reflect modern integrative TCM interpretation rather than a canonical early-text classification.
  • Its present-day reputation rests heavily on anti-inflammatory, respiratory, and metabolic research.

Modern Research

Active Compounds

  • Thymoquinone - the best-known bioactive constituent in black seed research
  • Volatile oil fractions - major contributors to respiratory and anti-inflammatory interest
  • Fixed oils rich in linoleic and oleic acids - part of the seed's cardiometabolic profile
  • Alkaloids and saponins - additional constituents relevant to broader pharmacologic activity

Studied Effects

  • A meta-analysis of randomized studies found that Nigella sativa supplementation improved asthma control, supporting one of its most consistent clinical-use areas (PMID 34658694).
  • A 2022 systematic review and meta-analysis reported improved cardiometabolic indicators in prediabetes and type 2 diabetes with Nigella sativa supplementation (PMID 36034891).
  • A 2016 review summarized both preclinical and clinical effects of Nigella sativa and thymoquinone across inflammatory, respiratory, metabolic, and immune contexts (PMID 27364039).

PubMed References

Safety & Interactions

Contraindications

  • Known allergy to black seed or black seed oil
  • Use of concentrated oil or extracts in pregnancy without supervision

Cautions

  • Memorial Sloan Kettering notes that pure Nigella sativa oil can cause allergic reactions and that high doses caused liver and kidney damage in animal studies.
  • MSK also warns that Nigella sativa may increase the risk of side effects from cytochrome P450 substrate drugs, although the clinical relevance is not fully known.
  • Food-level culinary use is not equivalent to high-dose oil or extract supplementation.

Drug Interactions

  • Cytochrome P450 substrate drugs - possible increase in side effects according to MSK
  • Antidiabetic medications - theoretical additive glucose-lowering effect
  • Antihypertensive medications - theoretical additive blood-pressure-lowering effect

Conditions