Plant Comparison
Cassia Cinnamon vs True Cinnamon
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.
At a glance
Cassia Cinnamon and True Cinnamon: both belong to the Lauraceae family; they share 5 indicated uses (bloating, blood sugar / diabetes support, cardiovascular / heart health, …); 1 pharmacological action in common.
Evidence face-off — shared uses
| Condition | Cassia Cinnamon | True Cinnamon | Verdict |
|---|---|---|---|
| Bloating | 7/10 | 1/10 | Stronger for Cassia Cinnamon |
| Blood sugar / diabetes support | 9/10 | 10/10 | Comparable evidence |
| Cardiovascular / heart health | 9/10 | 10/10 | Comparable evidence |
| Indigestion | 7/10 | 1/10 | Stronger for Cassia Cinnamon |
| Metabolic support | 9/10 | 9/10 | Comparable evidence |
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
The main volatile-oil constituent; associated with the insulin-sensitising effect.
Antioxidant constituents of the bark.
Present in much higher amounts in cassia than in Ceylon cinnamon (~2-5 mg/g); the key safety-limiting compound.
Trans-cinnamaldehyde is the principal constituent of cinnamon bark essential oil and the main driver of its antimicrobial, antifungal (anti-Candida) and anti-inflammatory activity, acting partly by damaging microbial cell membranes and inhibiting NF-kB signalling.
Cassia cinnamon (C. cassia) contains high levels of coumarin, which is potentially hepatotoxic in excess; true Ceylon cinnamon (C. verum) contains only trace coumarin and is the safer culinary/medicinal choice. Several pooled clinical and antimicrobial studies do not distinguish the two species.
Pharmacological Actions
Lowers fasting blood glucose as an adjunct in type 2 diabetes (evidence is positive but mixed) - recent meta-analyses report reduced fasting glucose, HbA1c and HOMA-IR
Traditional & Indicated Uses
Lowers fasting blood glucose as an adjunct in type 2 diabetes (evidence is positive but mixed) - recent meta-analyses report reduced fasting glucose, HbA1c and HOMA-IR
inferred from lipid-lowering action
inferred from lipid-lowering action
Warming carminative for indigestion (traditional)
inferred from anti-inflammatory action
inferred from antidiabetic action
inferred from anticancer action
inferred from antifungal action
inferred from anti-inflammatory action
inferred from antidiabetic action
inferred from anti-inflammatory action
Safety, Cautions & Contraindications
Cassia is high in coumarin: regular high intake of cassia bark or supplements can stress or damage the liver. For frequent or medicinal use, prefer true Ceylon cinnamon (Cinnamomum verum) and keep within safe daily limits.
Its blood-sugar-lowering action means it can add to the effect of diabetes medicines (risk of hypoglycaemia); avoid concentrated/medicinal doses in pregnancy (culinary amounts are fine).
True cinnamon (C. verum) is safe in culinary and moderate medicinal doses. Cassia (C. cassia) contains high coumarin — excessive intake may be hepatotoxic and should not be confused with true cinnamon. May lower blood sugar — use caution with antidiabetic medications. Avoid high doses during pregnancy.
Duke (2002) rates Ceylon cinnamon as +++ and provides clinical evidence (score 2) for antibacterial activity, consistent with Commission E and WHO recognition. Key activities include antifungal (anti-Candida), antispasmodic, and carminative effects. Cinnamon contains cinnamaldehyde, eugenol, and coumarin. Important safety concern: Duke's entry aggregates true cinnamon (C. verum) and cassia (C. cassia) — cassia contains significantly higher coumarin levels (potentially hepatotoxic) than true Ceylon cinnamon. True cinnamon (C. verum) has very low coumarin content and is safe at normal culinary doses. Medicinal dose: 0.5–1 g bark powder three times daily. Caution: cinnamon bark oil is highly irritating to mucous membranes (Duke, 2002).
External Ids
Botanical Description
Evergreen tree with smooth, aromatic, reddish-brown bark and leathery, oval leaves with three prominent longitudinal veins. Small, pale yellow-green flowers are borne in panicles, followed by small, dark, single-seeded berries. The dried inner bark, rolled into thick, dark reddish-brown quills, is the cassia cinnamon of commerce.
Evergreen tree with smooth, thin, light brown bark and leathery, oval leaves with three prominent longitudinal veins, often flushed reddish-pink when young. Small, pale yellow-green flowers are borne in panicles, followed by small, dark, single-seeded berries. The thin inner bark is peeled and dried into the characteristic pale, tightly layered, multi-ply quills of true cinnamon.
Habitat
Native to southern China and mainland Southeast Asia; cultivated extensively in China, Vietnam and Indonesia on warm, humid, tropical to subtropical hillsides.
Native to Sri Lanka and the Malabar coast of southern India; cultivated in warm, humid tropical lowlands, especially Sri Lanka, which remains the main source of true (Ceylon) cinnamon.
Harvesting
The bark is stripped from branches and stems of mature trees, then dried; as it dries it curls into the characteristic thick quills of cassia cinnamon, distinctly darker and rougher than the thin, tightly rolled quills of true (Ceylon) cinnamon.
Young shoots are cut back to encourage thin, straight new growth; the thin outer bark is scraped away and the paper-thin inner bark is peeled off, dried and rolled by hand into the characteristic multi-layered quills of Ceylon cinnamon.
Traditional Uses
Cassia bark (rou gui) is a major warming spice and digestive remedy of traditional Chinese medicine, used for cold-type digestive complaints, circulation and metabolic support; its cinnamaldehyde-rich bark is now widely studied as an adjunct for blood glucose and lipid management in type 2 diabetes, directly building on this traditional metabolic reputation.[11]
True cinnamon bark has an ancient trade and medicinal history across Asia, the Middle East and Europe as a warming digestive and circulatory remedy, used for indigestion and as a general tonic spice; because it contains only trace coumarin, it is considered the safer species for frequent or medicinal use compared with cassia.[8]
Preparations
Dried bark powder or standardised extract taken as capsules, the form used in most clinical glucose/lipid studies.
Dried bark powder or standardised extract taken as capsules for metabolic and antioxidant support.
Comminuted bark infused in hot water as a herbal tea, 0.5-1 g up to four times daily per the EU herbal monograph. The monograph describes an infusion; it does not cover a simmered decoction. Educational reference only, not a prescription.
Dosage
Clinical trials in type 2 diabetes commonly use around 1-6 g of cassia bark powder daily; because of its coumarin content, intake should be kept modest and consistent, and true (Ceylon) cinnamon preferred for frequent medicinal use. Educational reference only, not a prescription.
The EU herbal monograph on Cinnamomum verum J.S. Presl, cortex gives, for adults and elderly, 0.5-1 g of the comminuted bark as an infusion up to 4 times daily; a liquid extract at 0.5-1 mL three times daily and a tincture at a daily dose of 2-4 mL are also listed. Not recommended under 18 years, and a practitioner should be consulted if symptoms persist beyond 2 weeks. Note this is Ceylon cinnamon (C. verum); cassia species carry a much higher coumarin load and are not covered here. Educational reference only, not a prescription.
References
Drug Class Interactions
Lookalikes Review
Pairings
Not documented
Cinnamon and fenugreek can each lower blood sugar, so taking them together — especially alongside diabetes medicines — may add up and increase the risk of blood sugar dropping too low (hypoglycaemia). Monitor your blood glucose.[18, 19]
Cinnamon and bitter melon can each lower blood sugar, so taking them together — especially alongside diabetes medicines — may add up and increase the risk of hypoglycaemia. Monitor your blood glucose.[18, 20]
References & Sources
- Lin, C., Wu, S., Chang, C. and Ng, L (2003) 'Antioxidant activity of Cinnamomum cassia', Phytotherapy Research, 17(7), pp. 726-730. doi:10.1002/ptr.1190 Preclinical
https://doi.org/10.1002/ptr.1190 - Yan, Y., Fang, P., Yang, M., Li, N., Lu, Q. and Cheng, Y (2015) 'Anti-diabetic nephropathy compounds from Cinnamomum cassia', Journal of Ethnopharmacology, 165, pp. 141-147. doi:10.1016/j.jep.2015.01.049 Preclinical
https://doi.org/10.1016/j.jep.2015.01.049 - Zhang, C., Fan, L., Fan, S., Wang, J., Luo, T., Tang, Y., Chen, Z. and Yu, L (2019) 'Cinnamomum cassia Presl: A Review of Its Traditional Uses, Phytochemistry, Pharmacology and Toxicology', Molecules, 24(19), pp. 3473. doi:10.3390/molecules24193473 Meta-analysis / review
https://doi.org/10.3390/molecules24193473 - Li, C., Liao, L., Yang, S., Wang, L., Chen, H., Luo, P., Huang, G. and Huang, Y (2024) 'Cinnamaldehyde: An effective component of Cinnamomum cassia inhibiting Helicobacter pylori', Journal of Ethnopharmacology, 330, pp. 118222. doi:10.1016/j.jep.2024.118222 Preclinical
https://doi.org/10.1016/j.jep.2024.118222 - Cordero-Perez, P., Hernandez-Cruz, F.E., Garza-Guzman, D., Moreno-Pena, D.P., Sanchez-Martinez, C., Torres-Gonzalez, L., Munoz-Espinosa, L.E., Zapata-Chavira, H., Cura-Esquivel, I. and Serrano-Sandoval, M.I (2024) 'Antidiabetic and Anti-Inflammatory Effect of Cinnamomum cassia Oil in Alloxan-Induced Diabetic Rats', Pharmaceuticals, 17(9), pp. 1135. doi:10.3390/ph17091135 Preclinical
https://doi.org/10.3390/ph17091135 - Zaidi, S.F., Aziz, M., Muhammad, J.S. and Kadowaki, M (2015) 'Review: Diverse pharmacological properties of Cinnamomum cassia: A review', Pakistan Journal of Pharmaceutical Sciences, 28(4), pp. 1433-1438. Meta-analysis / review
https://scholar.google.com/scholar?q=Review%3A%20Diverse%20pharmacological%20properties%20of%20Cinnamomum%20cassia%3A%20A%20review - Lee, M.J., Seo, H.J., Hwang, G.S., Choi, S., Park, S.J., Hwang, S. and Kang, K.S (2022) 'Molecular Mechanism of Cinnamomum cassia against Gastric Damage and Identification of Active Compounds', Biomolecules, 12(4), pp. 525. doi:10.3390/biom12040525 Preclinical
https://doi.org/10.3390/biom12040525 - Han, Y., Song, M., Lee, D., Lee, S., Ahn, H., Yoo, J., Kim, H.J. and Kim, E (2023) 'Gastric Mucosal Protective Effects of Cinnamomum cassia in a Rat Model of Ethanol-Induced Gastric Injury', Nutrients, 16(1), pp. 55. doi:10.3390/nu16010055 Preclinical
https://doi.org/10.3390/nu16010055 - Kim, S.Y., Koo, Y.K., Koo, J.Y., Ngoc, T.M., Kang, S.S., Bae, K., Kim, Y.S. and Yun-Choi, H.S (2010) 'Platelet anti-aggregation activities of compounds from Cinnamomum cassia', Journal of Medicinal Food, 13(5), pp. 1069-1074. doi:10.1089/jmf.2009.1365 Preclinical
https://doi.org/10.1089/jmf.2009.1365 - Mamindla, S., Koganti, V.S.R.G.P., Ravouru, N. and Koganti, B (2017) 'Effect of Cinnamomum cassia on the Pharmacokinetics and Pharmacodynamics of Pioglitazone', Current Clinical Pharmacology, 12(1), pp. 41-49. doi:10.2174/1574884712666170207152020 Preclinical
https://doi.org/10.2174/1574884712666170207152020 - (2021) 'Impact of Cassia Bark Consumption on Glucose and Lipid Control in Type 2 Diabetes: An Updated Systematic Review and Meta-Analysis'. doi:10.7759/cureus.16376 Meta-analysis / review
https://doi.org/10.7759/cureus.16376 - Allen, R.W., Schwartzman, E., Baker, W.L., Coleman, C.I. and Phung, O.J (2013) 'Cinnamon use in type 2 diabetes: an updated systematic review and meta-analysis', Annals of Family Medicine. doi:10.1370/afm.1517 Meta-analysis / review
https://doi.org/10.1370/afm.1517 - Moridpour, A.H., Kavyani, Z., Khosravi, S., Farmani, E., Daneshvar, M., Musazadeh, V. and Faghfouri, A.H (2023) 'The effect of cinnamon supplementation on glycemic control in patients with type 2 diabetes mellitus: An updated systematic review and dose-response meta-analysis of randomized controlled trials', Phytotherapy Research, 38(1), pp. 117--130. doi:10.1002/ptr.8026 Meta-analysis / review
https://doi.org/10.1002/ptr.8026 - de Moura, S.L., Gomes, B.G.R., Guilarducci, M.J., Coelho, O.G.L., Guimaraes, N.S. and Gomes, J.M.G (2025) 'Effects of cinnamon supplementation on metabolic biomarkers in individuals with type 2 diabetes: a systematic review and meta-analysis', Nutrition Reviews, 83(2), pp. 249--279. doi:10.1093/nutrit/nuae058 Meta-analysis / review
https://doi.org/10.1093/nutrit/nuae058 - Allen, R.W., Schwartzman, E., Baker, W.L., Coleman, C.I. and Phung, O.J (2013) 'Cinnamon use in type 2 diabetes: an updated systematic review and meta-analysis', Annals of Family Medicine, 11(5), pp. 452-459. doi:10.1370/afm.1517 Meta-analysis / review
https://doi.org/10.1370/afm.1517
- Muthukuda, D. and de Silva, C.K. and Ajanthan, S. and Wijesinghe, N. and Dahanayaka, A. and Pathmeswaran, A (2025) 'Effects of Cinnamomum zeylanicum (Ceylon cinnamon) extract on lipid profile, glucose levels and its safety in adults: A randomized, double-blind, controlled trial', PLoS One, 20(1), pp. e0317904. doi:10.1371/journal.pone.0317904 Clinical study
https://doi.org/10.1371/journal.pone.0317904 - Singh, N. and Rao, A.S. and Nandal, A. and Kumar, S. and Yadav, S.S. and Ganaie, S.A. and Narasimhan, B (2020) 'Phytochemical and pharmacological review of Cinnamomum verum J. Presl - a versatile spice used in food and nutrition', Food Chemistry, 338, pp. 127773. doi:10.1016/j.foodchem.2020.127773 Meta-analysis / review
https://doi.org/10.1016/j.foodchem.2020.127773 - Kim, N.Y. and Kim, S. and Park, H.M. and Lim, C.M. and Kim, J. and Park, J.Y. and Jeon, K.B. and Poudel, A (2023) 'Cinnamomum verum extract inhibits NOX2/ROS and PKCdelta/JNK/AP-1/NF-kB pathway-mediated inflammatory response in PMA-stimulated THP-1 monocytes', Phytomedicine, 112, pp. 154685. doi:10.1016/j.phymed.2023.154685 Preclinical
https://doi.org/10.1016/j.phymed.2023.154685 - Pagliari, S. and Forcella, M. and Lonati, E. and Sacco, G. and Romaniello, F. and Rovellini, P. and Fusi, P. and Palestini, P (2023) 'Antioxidant and Anti-Inflammatory Effect of Cinnamon (Cinnamomum verum J. Presl) Bark Extract after In Vitro Digestion Simulation', Foods, 12(3), pp. 452. doi:10.3390/foods12030452 Preclinical
https://doi.org/10.3390/foods12030452 - Ul Hasnain, S.Z. and Ahmed, M. and Manzoor, R. and Amin, A. and Mudassir, J. and Jafar Rana, S. and Abbas, K (2024) 'Anti-inflammatory, antidiabetic and hypolipidemic potential of Cinnamomum verum J. Presl bark coupled with FT-IR and HPLC analysis', Pakistan Journal of Pharmaceutical Sciences, 37(6), pp. 1529-1544. Preclinical
https://scholar.google.com/scholar?q=Anti-inflammatory%2C%20antidiabetic%20and%20hypolipidemic%20potential%20of%20Cinnamomum%20verum%20J.%20Presl%20bark%20coupled%20with%20FT-IR%20and%20HPLC%20analysis - Gu, K., Feng, S., Zhang, X., Peng, Y., Sun, P., Liu, W., Wu, Y., Yu, Y., Liu, X., Deng, G., Zheng, J., Li, B. and Zhao, L (2023) 'Deciphering the antifungal mechanism and functional components of Cinnamomum cassia essential oil against Candida albicans', Journal of Ethnopharmacology, pp. 2023. doi:10.1016/j.jep.2023.117156 Preclinical
https://doi.org/10.1016/j.jep.2023.117156 - Aggarwal, S., Bhadana, K., Singh, B., Rawat, M., Mohammad, T., Al-Keridis, L.A., Alshammari, N., Hassan, M.I. and Das, S.N (2022) 'Cinnamomum zeylanicum extract and its bioactive component cinnamaldehyde show anti-tumor effects via inhibition of multiple cellular pathways', Frontiers in Pharmacology. doi:10.3389/fphar.2022.918479 Preclinical
https://doi.org/10.3389/fphar.2022.918479 - Groves, M (2016) 'Body into Balance'. Traditional / reference
https://scholar.google.com/scholar?q=Body%20into%20Balance - European Medicines Agency (HMPC) (2011) 'Community herbal monograph on Cinnamomum verum J.S. Presl, cortex'. Available at: https://www.ema.europa.eu/en/documents/herbal-monograph/community-herbal-monograph-cinnamomum-verum-js-presl-cortex_en.pdf Traditional / reference
https://www.ema.europa.eu/en/documents/herbal-monograph/community-herbal-monograph-cinnamomum-verum-js-presl-cortex_en.pdf - Jafari, A., Mardani, H., Faghfouri, A.H., AhmadianMoghaddam, M., Musazadeh, V. and Alaghi, A (2025) 'The effect of cinnamon supplementation on cardiovascular risk factors in adults: a GRADE assessed systematic review, dose-response and meta-analysis of randomized controlled trials', Journal of Health, Population and Nutrition, 44(1). doi:10.1186/s41043-025-00967-3 Meta-analysis / review
https://doi.org/10.1186/s41043-025-00967-3 - Akilen, R. et al (2010) 'Glycated haemoglobin and blood pressure-lowering effect of cinnamon in multi-ethnic Type 2 diabetic patients in the UK', 27(10), pp. 1159--1167. Clinical study
https://scholar.google.com/scholar?q=Glycated%20haemoglobin%20and%20blood%20pressure-lowering%20effect%20of%20cinnamon%20in%20multi-ethnic%20Type%202%20diabetic%20patients%20in%20the%20UK - Khan, A. et al (2003) 'Cinnamon improves glucose and lipids of people with type 2 diabetes', 26(12), pp. 3215--3218. doi:10.2337/diacare.26.12.3215 Traditional / reference
https://doi.org/10.2337/diacare.26.12.3215 - Moridpour, A.H., Kavyani, Z., Khosravi, S., Farmani, E., Daneshvar, M., Musazadeh, V. and Faghfouri, A.H (2023) 'The effect of cinnamon supplementation on glycemic control in patients with type 2 diabetes mellitus: An updated systematic review and dose-response meta-analysis of randomized controlled trials', Phytotherapy Research, 38(1), pp. 117--130. doi:10.1002/ptr.8026 Meta-analysis / review
https://doi.org/10.1002/ptr.8026 - de Moura, S.L., Gomes, B.G.R., Guilarducci, M.J., Coelho, O.G.L., Guimaraes, N.S. and Gomes, J.M.G (2025) 'Effects of cinnamon supplementation on metabolic biomarkers in individuals with type 2 diabetes: a systematic review and meta-analysis', Nutrition Reviews, 83(2), pp. 249--279. doi:10.1093/nutrit/nuae058 Meta-analysis / review
https://doi.org/10.1093/nutrit/nuae058 - Maierean, S.M., Serban, M.C., Sahebkar, A., Ursoniu, S., Serban, A., Penson, P. and Banach, M (2017) 'The effects of cinnamon supplementation on blood lipid concentrations: A systematic review and meta-analysis', Journal of Clinical Lipidology, 11(6), pp. 1393--1406. doi:10.1016/j.jacl.2017.08.004 Meta-analysis / review
https://doi.org/10.1016/j.jacl.2017.08.004 - Duke, J.A (2002) 'Handbook of Medicinal Herbs, Second Edition'. Traditional / reference
https://scholar.google.com/scholar?q=Handbook%20of%20Medicinal%20Herbs%2C%20Second%20Edition - Allen, R.W., Schwartzman, E., Baker, W.L., Coleman, C.I. and Phung, O.J (2013) 'Cinnamon use in type 2 diabetes: an updated systematic review and meta-analysis', Annals of Family Medicine, 11(5), pp. 452-459. doi:10.1370/afm.1517 Meta-analysis / review
https://doi.org/10.1370/afm.1517 - de Moura, S.L., Gomes, B.G.R., Guilarducci, M.J., Coelho, O.G.L., Guimaraes, N.S. and Gomes, J.M.G (2025) 'Effects of cinnamon supplementation on metabolic biomarkers in individuals with type 2 diabetes: a systematic review and meta-analysis', Nutrition Reviews, 83(2), pp. 249-279. doi:10.1093/nutrit/nuae058 Meta-analysis / review
https://doi.org/10.1093/nutrit/nuae058 - Kim, J., Noh, W., Kim, A., Choi, Y. and Kim, Y.S (2023) 'The effect of fenugreek in type 2 diabetes and prediabetes: a systematic review and meta-analysis of randomized controlled trials', International Journal of Molecular Sciences, 24(18), pp. 13999. doi:10.3390/ijms241813999 Meta-analysis / review
https://doi.org/10.3390/ijms241813999 - Zhang, X., Zhao, Y., Song, Y. and Miao, M (2024) 'Effects of Momordica charantia L. supplementation on glycemic control and lipid profile in type 2 diabetes mellitus patients: a systematic review and meta-analysis of randomized controlled trials', Heliyon, 10(10), pp. e31126. doi:10.1016/j.heliyon.2024.e31126 Meta-analysis / review
https://doi.org/10.1016/j.heliyon.2024.e31126
Generated automatically from the Omnia Sana plant database and its cited sources. For educational purposes only — not medical advice. Always consult a qualified practitioner before using medicinal plants.