Su Mu (Sappan Wood)

Chinese Herb Actions

Chinese Herb Dosage

• What is the typical dosage of Su Mu (Sappan Wood)?

  Roughly 3–9 g in decoction is the range given by standard materia medica (some references extend to ~10 g), typically combined with other blood-invigorating and pain-relieving herbs rather than used alone. Higher end-of-range doses are traditionally reserved for acute trauma.

  Source: Bensky-aligned materia medica dosage range; cross-referenced against multiple online sources (herb databases). Reference only — not a prescription.

Chinese Herb Contraindications & Cautions

• Are there cautions for Su Mu (Sappan Wood)?

  Su Mu is contraindicated during pregnancy — its blood-invigorating, stasis-dispelling action carries a traditional risk of provoking miscarriage — and it is contraindicated where there is no blood stasis, including blood deficiency without stasis and excessive menstrual/uterine bleeding not caused by stasis.

  • Pregnancy — avoid; blood-invigorating herbs of this category are traditionally restricted in pregnancy.
  • No stasis present — not indicated for blood deficiency or bleeding patterns without an underlying stasis component.
  • General — best used under a qualified TCM practitioner, particularly when combined with other blood-moving herbs.

  Source: Bensky-aligned materia medica cautions; cross-referenced against multiple online sources (herb databases).

Chinese Herb Toxicity & Overdose

• Low toxicity is reported at standard decoction doses. A 2025 phytochemistry review of Caesalpinia sappan compiled predicted LD50 values (in the hundreds to low thousands of mg/kg across major constituents), consistent with a low-toxicity profile; no significant human toxicity is documented in the materia medica literature at typical doses. As with other blood-invigorating herbs, excess/prolonged use is traditionally cautioned against rather than treated as inherently toxic.

  Source: Frontiers in Pharmacology (2025) phytochemistry/toxicity review, PMC 11747472; materia medica consensus. Reference note, not a safety guarantee.

Herb-Drug Interactions

• No well-established clinical herb–drug interactions are documented for Su Mu. A preclinical finding is worth flagging: brazilin, its principal active compound, has been shown in vitro to act as a collagen-receptor agonist that promotes platelet aggregation — a mechanism distinct from, and not obviously predicted by, its traditional blood-invigorating use. This is precautionary awareness for patients on antiplatelet or anticoagulant therapy, not a demonstrated clinical interaction. (Flagged for practitioner confirmation.)

Western / Biomedical Research

Chinese Herb Clinical Studies & Research

Provided as research context — a summary of published biomedical study, not a therapeutic or medical claim.

• Is there modern research on Su Mu (Caesalpinia sappan, Lignum Sappan)?

  Yes — mostly preclinical/laboratory research, concentrated on brazilin, its principal heartwood compound, with no clinical trials identified for the traditional trauma/blood-stasis indications. Studies span anti-inflammatory, antibacterial, and platelet-activity effects.

  • Anti-inflammatory (chondrocytes & macrophages) — an ethanolic C. sappan extract suppressed IL-1β and TNF-α and blocked NF-κB/COX-2 signaling in human joint cells, suggesting a mechanistic basis for traditional anti-swelling, anti-pain use; cell-culture study, not clinical evidence.
  • Anti-inflammatory compounds isolated — five C. sappan heartwood compounds (including brazilin, sappanol, and episappanol) each inhibited IL-6 and TNF-α secretion, with brazilin showing the strongest effect; preclinical.
  • Rheumatoid-arthritis model — brazilin reduced arthritis severity, paw swelling, and inflammatory cytokines (TNF-α, IL-1β, IL-6) and preserved bone structure in a mouse collagen-induced-arthritis model; animal study, not human evidence.
  • Platelet activity — brazilin was shown to act as a novel collagen-receptor agonist that promotes platelet aggregation in human platelets in vitro — a finding relevant to the drug-interaction note above.
  • Antibacterial + anti-inflammatory extract — a brazilin-enriched C. sappan extract reduced foodborne bacterial pathogens and inhibited NO/iNOS/COX-2 inflammatory markers in vitro.

  Overall: consistent preclinical support for anti-inflammatory and analgesic mechanisms broadly compatible with the traditional "reduces swelling, alleviates pain" action; no clinical trials located for the classic TCM indications (traumatic injury, blood-stasis amenorrhea, postpartum abdominal pain).

  Sources: PMID 21963554 (J Ethnopharmacol 2011, chondrocyte/macrophage anti-inflammatory); PMID 26951869, DOI 10.1039/c5fo01256b (Food Funct 2016, isolated anti-inflammatory compounds); PMID 25896410, PMC 4410491 (BMC Complement Altern Med 2015, collagen-induced arthritis model); PMID 23350663, PMC 3564834 (J Biomed Sci 2013, platelet collagen-receptor agonist); PMID 35807650, PMC 9269513 (Plants 2022, antibacterial/anti-inflammatory extract). Research context, not a therapeutic claim.

Chinese Herb Notes

• How is Su Mu different from Hong Hua (Safflower)?

  Su Mu and Hong Hua both invigorate blood and dispel stasis for overlapping indications — traumatic injury, blood-stasis amenorrhea, and postpartum abdominal pain — but Hong Hua is the more widely used gynecological blood-mover, while Su Mu is reached for more specifically in trauma.

  • Hong Hua (Safflower) — the more commonly used of the two; a mainstay in gynecological blood-stasis formulas (e.g. amenorrhea, dysmenorrhea, postpartum abdominal pain) and general blood-invigorating combinations.
  • Su Mu (Sappan Wood) — similar range of action but used less often overall; favored specifically for traumatic injury — sprains, contusions, and fractures — where its channel-unblocking, swelling-reducing action is emphasized.

  Both are contraindicated in pregnancy and are typically combined with other trauma or blood-invigorating herbs rather than used as a solo agent. (Traditional comparison, not treatment advice.)

  Source: Bensky & Chen&Chen-aligned materia medica consensus; cross-referenced against multiple online sources (herb comparison notes).