This product is not intended to diagnose, treat, cure, or prevent any disease. These statements have not been evaluated by the Food and Drug Administration.
This information is for educational purposes only and is not a substitute for professional medical advice, diagnosis, or treatment. Always consult your healthcare provider before using herbs, especially if you are pregnant, nursing, taking medications, or have a medical condition.
How does Cassia cinnamon work to lower blood sugar?
Cassia cinnamon's primary active compound, cinnamaldehyde, works through multiple mechanisms to regulate blood sugar. It enhances insulin receptor sensitivity and promotes glucose uptake into cells. Additionally, it inhibits digestive enzymes like alpha-amylase and alpha-glucosidase, slowing carbohydrate breakdown and glucose absorption. Phenylpropanoids and tannins contribute to these effects. Evidence level B supports these mechanisms, though human trials show mixed results. The warming properties in Traditional Chinese Medicine also address underlying Yang deficiency patterns associated with metabolic dysfunction.
Does Cassia cinnamon interact with blood thinning medications?
Yes, Cassia cinnamon poses significant interaction risks with anticoagulant and antiplatelet medications. The coumarin content (approximately 0.4-1.2%) has blood-thinning properties that can potentiate drugs like warfarin, heparin, clopidogrel, and aspirin, increasing bleeding risk. Patients taking anticoagulants should avoid therapeutic doses of Cassia cinnamon or consult a qualified healthcare provider. Ceylon cinnamon (Cinnamomum verum) contains negligible coumarin and may be a safer alternative for those on blood-thinning medications. Evidence level B supports this interaction concern.
What is the recommended daily dosage of Cassia cinnamon?
The typical adult dosage for Cassia cinnamon is 1-6 grams of powdered bark daily or 200-500 mg of standardized extract. For blood sugar management, studies commonly use 1-6 grams daily, divided into doses with meals. However, due to coumarin content, long-term daily intake should not exceed 1-2 grams to minimize liver toxicity risk. Those with liver conditions should avoid therapeutic doses entirely. Evidence level B supports these dosage ranges. Always consult a healthcare provider before starting supplementation.
Is Cassia cinnamon safe during pregnancy?
Cassia cinnamon is considered unsafe during pregnancy and should be avoided in therapeutic doses. The high cinnamaldehyde content can stimulate uterine contractions and act as an emmenagogue, potentially triggering miscarriage or premature labor. Traditional Chinese Medicine contraindicates strong warming herbs during pregnancy. While small culinary amounts in food are generally considered acceptable, medicinal doses (1+ grams daily) are not recommended. Pregnant women should consult their healthcare provider before using any cinnamon supplements. Evidence level D (traditional use) supports this contraindication.
Can Cassia cinnamon cause liver damage?
Yes, Cassia cinnamon can cause hepatotoxicity due to its significant coumarin content (0.4-1.2%). Coumarin is metabolized by the liver into compounds that can cause liver cell damage with prolonged or high-dose exposure. Individuals with pre-existing liver disease should avoid Cassia cinnamon entirely. Symptoms of coumarin-induced liver toxicity include elevated liver enzymes, jaundice, and fatigue. European food safety authorities recommend limiting coumarin intake to 0.1 mg per kg body weight daily. Ceylon cinnamon contains negligible coumarin and is a safer alternative for long-term use. Evidence level B supports this concern.
PubMed-compiled information sheet
This sheet was compiled from PubMed (NIH) abstracts using AI assistance. Every factual claim is cited to a real PubMed article (see the source list). It has not yet been human-reviewed — confirm with a healthcare provider before use.
Compiled from 28 PubMed articles · model: gemma4:31b
Summary
Cassia Cinnamon (Cinnamomum aromaticum/cassia) is a tropical aromatic tree used globally as a spice and in traditional medicine for its diverse pharmacological effects [PMID:31557828, PMID:26142534].
Background
Cinnamomum cassia Presl (also known as Cinnamomum aromaticum) is a tropical aromatic evergreen tree of the Lauraceae family [PMID:31557828, PMID:33366208]. It is distinct from Ceylon cinnamon (Cinnamomum verum), and the two are distinguished by morphological, chemical, and genetic markers [PMID:40986675, PMID:37306873].
Traditional uses
It is used in traditional Chinese, Ayurvedic, Japanese, and Unani medicine to manage conditions such as dyspepsia, peptic ulcer disease, ischemic brain injury, and as a galactogogue [PMID:40986675, PMID:26142534]. In China, the bark (Rou-Gui) is used to treat diseases resulting from kidney yang deficiency, including diabetic nephropathy [PMID:25725434].
Active compounds
The main constituents include terpenoids, phenylpropanoids, and glycosides [PMID:31557828]. Key active compounds include cinnamaldehyde (the major component of its essential oil), coumarin, emodin, and cinnamyl alcohol [PMID:40986675, PMID:38409705, PMID:16710900].
Mechanism of action
Cinnamaldehyde has been shown to inhibit Helicobacter pylori [PMID:38663778]. Hot water extracts have been observed to improve tight junction (TJ) barrier function and decrease proinflammatory cytokine expression in the intestine [PMID:37781063]. Pre-treatment with C. cassia may reduce gastric acid secretion and the expression of acid secretion-linked receptors [PMID:38201885].
Clinical evidence
Evidence BType 2 Diabetes Mellitus
Cassia cinnamon has shown potential in reducing fasting blood glucose and HbA1c [PMID:30144878]. Some randomized clinical trials provide strong scientific evidence for its use in T2DM [PMID:18066129], although other narrative reviews note that meta-analysis conclusions remain mixed [PMID:27618575].
Evidence DH. pylori Infection
Cinnamaldehyde from C. cassia is effective in inhibiting the growth of H. pylori [PMID:38663778].
Evidence DGastric Injury
In a rat model, C. cassia mitigated ethanol-induced gastric mucosal lesions and bleeding [PMID:38201885].
Evidence DIntestinal Inflammation
Hot water extract improved histological index and decreased cytokine concentrations in colitis model mice [PMID:37781063].
Safety & adverse effects
Cinnamon is generally well tolerated, though occasional bloating, dyspepsia, heartburn, and nausea are reported [PMID:40986675]. Notably, cassia cinnamon contains high amounts of coumarin, which is described as a toxic ingredient [PMID:40986675].
Pregnancy & lactation
No data exist on the safety of cinnamon in nursing mothers or infants [PMID:40986675].
Evidence summary
Evidence for glycemic control in T2DM is present in clinical trials but remains mixed across reviews. Most other pharmacological claims (anti-inflammatory, gastroprotective, antimicrobial) are supported by in vitro or animal studies.
2.PMID: 30144878 (2018) — To what extent does cinnamon administration improve the glycemic and lipid profiles? · Clinical nutrition ESPEN
3.PMID: 31557828 (2019) — Cinnamomum cassia Presl: A Review of Its Traditional Uses, Phytochemistry, Pharmacology and Toxicology. · Molecules (Basel, Switzerland)
4.PMID: 26142534 (2015) — Review: Diverse pharmacological properties of Cinnamomum cassia: A review. · Pakistan journal of pharmaceutical sciences
5.PMID: 33366208 (2019) — The complete plastid genome of Chinese cinnamon, Cinnamomum aromaticum Nees (Lauraceae). · Mitochondrial DNA. Part B, Resources
Government sources
No direct government monograph is available for this herb. The content below is AI-generated and has not been verified against an authoritative government source. Use the search links to check official sources before relying on this information.
PMID: 27618575 (2016) — Do Cinnamon Supplements Have a Role in Glycemic Control in Type 2 Diabetes? A Narrative Review. · Journal of the Academy of Nutrition and Dietetics
7.PMID: 25725434 (2015) — Anti-diabetic nephropathy compounds from Cinnamomum cassia. · Journal of ethnopharmacology
8.PMID: 38663778 (2024) — Cinnamaldehyde: An effective component of Cinnamomum cassia inhibiting Helicobacter pylori. · Journal of ethnopharmacology
9.PMID: 37781063 (2023) — Cinnamon (Cinnamomum cassia) hot water extract improves inflammation and tight junctions in the intestine in vitro and in vivo. · Food science and biotechnology
10.PMID: 37306873 (2023) — Development of species-specific ISSR-derived SCAR marker for early discrimination between Cinnamomum verum and Cinnamomum cassia. · Molecular biology reports
11.PMID: 16710900 (2006) — Antimicrobial activities of cinnamon oil and cinnamaldehyde from the Chinese medicinal herb Cinnamomum cassia Blume. · The American journal of Chinese medicine
12.PMID: 38201885 (2023) — Gastric Mucosal Protective Effects of Cinnamomum cassia in a Rat Model of Ethanol-Induced Gastric Injury. · Nutrients
13.PMID: 38409705 (2024) — The Power of the Underutilized and Neglected Medicinal Plants and Herbs of the Middle East. · Reviews on recent clinical trials
14.PMID: 18066129 (2007) — From type 2 diabetes to antioxidant activity: a systematic review of the safety and efficacy of common and cassia cinnamon bark. · Canadian journal of physiology and pharmacology