Cinnamon
Cinnamon Extract (Ceylon/Cassia)
Cinnamon extract, derived from either Ceylon (Cinnamomum verum) or Cassia (Cinnamomum cassia) species, is a widely used botanical supplement primarily studied for its ability to support blood glucose regulation and insulin sensitivity. It is also used for its antioxidant, anti-inflammatory, and antimicrobial properties. Ceylon cinnamon is preferred for long-term supplementation due to its significantly lower coumarin content compared to Cassia.
Mechanism of Action
Cinnamon's primary bioactive compounds — including cinnamaldehyde, cinnamic acid, and A-type proanthocyanidins — enhance insulin signaling by upregulating insulin receptor substrate proteins (IRS-1) and activating GLUT4 transporter translocation to cell membranes, improving peripheral glucose uptake. Cinnamaldehyde also inhibits alpha-glucosidase and alpha-amylase enzymes in the gut, slowing carbohydrate digestion and blunting postprandial glucose spikes. Additionally, cinnamon exhibits antioxidant activity by scavenging reactive oxygen species and may reduce NF-kB-mediated inflammatory signaling.
Evidence by Health Goal(17 goals)
Dosing Protocols
With meals, particularly carbohydrate-containing meals
Ceylon cinnamon is strongly preferred for daily use due to low coumarin content. For Cassia cinnamon, limit use to short periods or lower doses to reduce coumarin-related hepatotoxicity risk. Standardized extracts (e.g., 20:1 ratio) at 250-500mg are commonly used in studies showing glycemic benefit.
Safety & Side Effects
Ceylon cinnamon is generally regarded as safe for long-term use at typical supplemental doses, while Cassia cinnamon carries a meaningful hepatotoxicity and anticoagulant risk due to high coumarin content and should be used cautiously or avoided in daily supplementation. Individuals with liver disease, those on anticoagulants, or diabetics on glucose-lowering medications should consult a healthcare provider before use.
Possible Side Effects
- !Gastrointestinal discomfort including nausea, bloating, or diarrhea at higher doses
- !Oral mucosa irritation or burning sensation with high-dose powdered forms
- !Hypoglycemia risk when combined with insulin or oral antidiabetics
- !Hepatotoxicity with chronic high-dose Cassia cinnamon due to coumarin accumulation
- !Allergic contact dermatitis or skin sensitization in susceptible individuals
- !Coumarin-induced anticoagulant effects with prolonged Cassia use
- !Potential exacerbation of liver conditions with long-term Cassia extract use
Interactions
- -May potentiate blood glucose-lowering effects of insulin, metformin, and other antidiabetic medications — monitor for hypoglycemia
- -Cassia cinnamon may enhance anticoagulant effects of warfarin due to coumarin content — INR monitoring recommended
- -May additively lower blood pressure when combined with antihypertensive medications
- -Can interact with hepatotoxic drugs or supplements (e.g., acetaminophen, kava) — avoid combining with Cassia extract
- -May enhance the glucose-lowering effect of other supplements such as berberine or alpha-lipoic acid — use caution in combination protocols
Cost & Where to Buy
Basic Cassia cinnamon capsules are inexpensive at $6-10/month; standardized Ceylon cinnamon extracts from reputable brands range from $15-25/month. Price varies significantly by species, extraction ratio, and brand quality.
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