Dai Mao
StarEretmochelys imbricata (Linnaeus)
Traditionally used for
- Colds & fever
- Mood & calm
- Nerves & recovery
Cautions & contraindications
- Seizure disorders
- Toxic — professional use only
☯ TCM Properties
Sedates the Heart, quiets the Spirit, calms the Liver, extinguishes Wind, settles convulsions, stops spasms, clears Heat and resolves toxicity; Calms and anchors Liver Yang
Traditional Chinese Uses
Dai Mao is the carapace of the hawksbill sea turtle, Eretmochelys imbricata. In classical medicine it is sweet, salty and cold, entering the Heart and Liver, where it clears Heat, resolves toxicity, calms and anchors ascendant Liver Yang, and extinguishes internal Wind to settle convulsions and spasms. It was used for high fever with delirium, childhood convulsions, mania and Heat-toxin rashes, and to sedate the Heart and quiet the Spirit.
Conservation note: the hawksbill turtle is Critically Endangered and listed on CITES Appendix I; harvest and international trade are illegal. This entry is provided for historical reference only and does not endorse sourcing or use. Modern practitioners substitute other Liver-calming, Wind-extinguishing and Heat-clearing substances such as Shi Jue Ming (abalone shell), Gou Teng and mineral shells.
Relationships
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Botanical Description
Dai Mao (玳瑁) is the carapace of the hawksbill sea turtle, Eretmochelys imbricata (Cheloniidae), a tropical marine reptile historically harvested from coastal waters of southern China and Southeast Asia for its translucent, mottled brown-and-amber shell. The hawksbill turtle is listed on CITES Appendix I, and international commercial trade in its shell has been banned since 1977. Possession and trade are illegal in most countries, and modern TCM practice almost universally substitutes other materials. Classical Chinese materia medica classified Dai Mao as sweet and cold, entering the Heart and Liver channels, used to clear heat, cool blood, calm the spirit, and extinguish wind for high fever with convulsions, delirium, and skin eruptions. This entry is documented for historical reference only; conservation and legal restrictions preclude contemporary use.
Active Constituents
Corneous beta-proteins (beta-keratins) of the scute
Structural fibrous proteinConcentration: the dominant constituent of the scute; the corneous material of chelonian carapace is largely beta-keratin, with reported glycine-proline-serine-tyrosine rich chains of roughly 122-174 amino acids and bands at about 13-24 kDa
Hawksbill shell (bekko, tortoiseshell) is keratin. It is a structural protein of the same broad class as horn, hoof, claw and nail, and it has no characterised bioactive small molecule. Solazzo et al. (2021) sequenced the corneous beta-proteins of the five main marine turtle species, Eretmochelys imbricata included, and built species-diagnostic peptide markers from them; the purpose of that work is forensic identification of tortoiseshell, not pharmacology. Nothing in the published chemistry distinguishes hawksbill keratin pharmacologically from the keratin of a legally farmed animal.
Amino acids and peptides released on hydrolysis
Protein hydrolysis productsConcentration: not quantified for Eretmochelys imbricata scute in the peer-reviewed literature retrieved
A decoction or acid hydrolysate of any keratinous animal drug yields free amino acids and short peptides. No species-specific hydrolysate profile has been published for hawksbill shell, and no constituent of it has been shown to account for the sedative, antipyretic or anticonvulsant actions the classical texts ascribe to Dai Mao.
⚠ Drug Interactions
Any preparation containing hawksbill turtle shell (Dai Mao, bekko, tortoiseshell)
Eretmochelys imbricata is listed on CITES Appendix I, the Atlantic population from the Convention's entry into force in 1975 and the whole species from 4 February 1977, which prohibits international commercial trade in the animal and its parts. The IUCN Red List assessment (Mortimer and Donnelly, IUCN SSC Marine Turtle Specialist Group, 2008) classes the species Critically Endangered on the basis of global population decline of 80% or more over three generations. China's National Key Protected Wildlife List, revised in 2021, raised all sea turtles including the hawksbill to Class I national protection. In the United States the species is listed as endangered under the Endangered Species Act.
The demand this record concerns is a documented cause of that decline, not an incidental one. Miller et al. (2019) reconstructed 150 years of tortoiseshell trade records and estimated that roughly nine million hawksbills were taken for their shells between 1844 and 1992, more than six times previous estimates, averaging about 60,000 animals a year - more than twice the current estimate of the entire global breeding female population. Senko et al. (2022) document continuing illegal exploitation of marine turtles worldwide in the CITES era. The shell is the reason the animal is killed, and medicinal, ornamental and jewellery demand draw on the same supply.
Clinical note: Do not prescribe, dispense, stock, import or recommend Dai Mao. There is no therapeutic case that offsets the legal position, because the material is keratin and has no demonstrated activity that a legal substance cannot provide. Where a historical formula such as Zhi Bao Dan specifies Dai Mao, the modern practice is to reformulate: water buffalo horn (Cornu Bubali, Bubalus bubalis) is the Pharmacopoeia-sanctioned replacement for the rhinoceros-horn class of heat-clearing, toxin-resolving animal drugs that Dai Mao belongs to, and it is the substitute the substitution literature has actually validated by proteomic and bio-effect comparison. Note honestly that no published study validates any substitute for hawksbill shell specifically - the framework proposed by Luo et al. (2013), pairing DNA-barcode trade monitoring with bioequivalence testing of a domestic-animal replacement, has been carried out for horns and not for hawksbill scute. If a patient presents with the material, do not handle or transport it; direct them to the national CITES management authority or wildlife enforcement body.
Substituted, imitation and misidentified tortoiseshell (plastic, bovine horn, other sea turtle species)
Because legal supply does not exist, anything offered as Dai Mao is either illegally taken hawksbill or an imitation. Solazzo et al. (2021) developed the corneous beta-protein peptide database precisely because visual identification cannot separate hawksbill scute from the scutes of Chelonia mydas, Caretta caretta, Lepidochelys olivacea and Lepidochelys kempii, nor from worked imitations. A practitioner therefore has no way to know what is in the packet, and testing it would in most jurisdictions require declaring a controlled specimen.
Clinical note: Refuse the material regardless of what it is claimed to be. A separate point worth knowing: hawksbill is the sea turtle species most often implicated in chelonitoxism, the sometimes fatal poisoning that follows eating marine turtle flesh. That hazard belongs to the meat rather than the shell, but it is another reason the species should not be entering any medicinal supply chain.
Sedatives, anticonvulsants and antihypertensives
The classical indications - settling fright, calming the Liver, extinguishing Wind, clearing Heat and resolving toxicity - would, if real, imply interaction with sedative, anticonvulsant and antihypertensive drugs. No such interaction can be assessed. There are no randomised trials, no controlled cohort data and no published animal pharmacology specific to Eretmochelys imbricata scute. The evidence base is a keratin composition and a classical textual tradition, and nothing else. This entry is recorded to make the absence explicit, not to imply an effect.
Clinical note: This is not a reason to use the drug cautiously; it is one more reason not to use it. Nothing about its claimed actions is established well enough to be dosed against, and it must not be substituted for anticonvulsant or antihypertensive therapy.
Dosage
| Form | Amount | Frequency | Duration | Population | Notes |
|---|---|---|---|---|---|
| decoction | 9–15 g | Daily | — | — | Standard oral dose per Xi S, Gong Y. Essentials of Chinese Materia Medica and Medical Formulas. Academic Press/Elsevier, 2017, pp. 307–310. Exact wording: Normally, 9–15 g is decocted with water as an oral |
⚠ Safety & Contraindications
- Seizure disorders
- Toxic — professional use only
Contraindications
Its use is prohibited in patients with deficiency- cold syndrome but no fire toxin.
Source: Xi S, Gong Y. Essentials of Chinese Materia Medica and Medical Formulas. Academic Press/Elsevier, 2017, pp. 307–310.
Safety Warnings
- Hawksbill sea-turtle shell: illegal to trade or dispense.
Regulatory Status
- CITES Appendix I — international trade prohibited.
Historical Texts
Kai Bao Ben Cao
Song dynasty (973-974)Tai Ping Hui Min He Ji Ju Fang
Song dynasty (1078-1107)Ben Cao Gang Mu
Ming dynasty (1596)References
- Mortimer, J.A. and Donnelly, M. (IUCN SSC Marine Turtle Specialist Group). Eretmochelys imbricata: Mortimer, J.A & Donnelly, M. (IUCN SSC Marine Turtle Specialist Group) . IUCN Red List of Threatened Species (2008) [DOI]
- Emily A. Miller, Loren McClenachan, Yoshikazu Uni, George Phocas, Molly E. Hagemann, Kyle S. Van Houtan. The historical development of complex global trafficking networks for marine wildlife . Science Advances (2019) [DOI]
- Jesse F. Senko, Kayla M. Burgher, Maria del Mar Mancha-Cisneros, Brendan J. Godley, Irene Kinan-Kelly, Trevor Fox, Frances Humber, Volker Koch, Andrew T. Smith, Bryan P. Wallace. Global patterns of illegal marine turtle exploitation . Global Change Biology (2022) [DOI]
- Caroline Solazzo, Jean Soulat, Timothy Cleland. Creation of a peptide database of corneous beta-proteins of marine turtles for the identification of tortoiseshell: archaeological combs as case study . Royal Society Open Science (2021) [DOI]
- Jiao-yang Luo, Dan Yan, Jing-yuan Song, Da Zhang, Xiao-yan Xing, Yu-mei Han, Mei-hua Yang, Xiao-ping Dong, Cheng Peng, Shi-lin Chen, Xiao-he Xiao. A strategy for trade monitoring and substitution of the organs of threatened animals . Scientific Reports (2013) [DOI]
This information is for educational purposes only and is not intended to replace professional medical advice. Always consult a qualified healthcare provider before using any herbal remedy, especially if you are pregnant, nursing, or taking medications.
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