ModerateSynergy
Berberine
Both may lower glucose and can be useful together but increase hypoglycemia risk when diabetes medication is present.
Recommendation: Use conservative doses and monitor glucose, especially when adding either product.
Cinnamon Extract
Herb ·Moderate evidence ·Reviewed May 2026
Cinnamon extract is a concentrated form of Cinnamomum bark studied for modest improvements in fasting glucose, insulin sensitivity, and blood lipids. Effects are variable and should not replace diabetes medication, nutrition therapy, or glucose monitoring. Cassia cinnamon can contain substantial coumarin, so Ceylon or low-coumarin extracts are preferred for longer use.
What it's good for
The bottom line
Evidence rating moderate. Most-documented uses: may modestly lower fasting glucose, may improve insulin sensitivity markers, may modestly lower triglycerides and ldl-c in some studies. 3 sources indexed (2003–2013), with 4 interaction records on file.
The science
How it works, mechanistically.
Core mechanism
Cinnamon polyphenols and cinnamaldehyde appear to influence insulin receptor signaling, glucose transporter activity, AMPK-related pathways, gastric emptying, and digestive enzyme activity. These mechanisms may blunt post-meal glucose excursions and modestly improve insulin sensitivity in some people. Cassia cinnamon also contains coumarin, which can stress the liver in susceptible users, making species and standardization clinically important.1,2
Class
Polyphenol-rich glucose support spice extract
Found in food
Cinnamon bark used as a culinary spice, Cinnamon tea
Low-status signs
None - cinnamon is not an essential nutrient and has no deficiency state
Absorption
Water-soluble; take with food
Dosing
Dosing & protocol.
Common range
500-2,000 mg/day standardized extract or 1-6 g/day cinnamon powder, preferably low-coumarin for longer use
Recommended form
Ceylon cinnamon or low-coumarin water extract standardized for polyphenols
Take with carbohydrate-containing meals for glucose-response goals. Water extracts may reduce coumarin exposure compared with whole cassia powder.1,3
Forms
Forms & what to buy.
Ranked by evidence and value.
Ceylon Cinnamon Capsule Recommended
Lower coumarin exposure than cassia; standardization varies. Take with meals.
Low-Coumarin Water Extract
Water extraction can concentrate polyphenols while limiting coumarin. Take before or with carbohydrate-containing meals.
Cassia Cinnamon Powder
Inexpensive but coumarin content can be high and variable. Use with food; avoid chronic multi-gram dosing.
Cost
What it actually costs.
Real-world pricing across three quality tiers. Assumes Low-coumarin cinnamon extract capsule.
BudgetBest value
$2 /mo
$0.08 per dose
Mid
$8 /mo
$0.25 per dose
Premium
$17 /mo
$0.55 per dose
Ceylon and verified low-coumarin extracts cost more but are preferable for repeated use. Updated 2026-06-04.
Goals
Goal-based dosing.
Fasting Glucose Support
Dose: 500-2,000 mg/day extract1,2
Timing: With meals
Use as an adjunct to diet and activity; verify response with glucose or HbA1c.
Lab work
Markers to track.
What to test, the optimal window inside the conventional range, and how long a response takes.
Fasting Plasma Glucose FPG
May modestly lower fasting glucose and HbA1c in responders.1,2
Optimal
70–90 mg/dL
Conventional
70–99 mg/dL
Responds in
8-12 weeks
70optimal99
Check fasting glucose at baseline and after a consistent trial; monitor more closely if using glucose-lowering medication.
Hemoglobin A1cFasting insulinTriglycerides
Hemoglobin A1c HbA1c
May modestly lower HbA1c when glycemic control improves.
Optimal
4.8–5.4 %
Conventional
4–5.6 %
Responds in
12 weeks
4optimal5.6
HbA1c reflects roughly 2-3 months of glycemia and should not be interpreted alone in anemia or altered red cell turnover.
Fasting plasma glucosePostprandial glucoseFasting insulin
Why people use it
Symptoms it's matched to.
Where this appears in the symptom-to-supplement map, ranked by relevance.
High fasting glucose
58% relevance
May improve insulin signaling and glucose uptake.1,2
MetabolicModerate evidenceLow-coumarin extract with meals
Best verified with glucose monitoring.
Post-meal glucose spikes
50% relevance
May slow carbohydrate digestion and support insulin response.1,2
MetabolicEmerging evidenceWater extract before meals
Effect size is variable.
Insulin resistance pattern
43% relevance
Polyphenols may affect AMPK and insulin receptor pathways.
MetabolicEmerging evidenceCeylon or low-coumarin extract
Lifestyle intervention remains primary.
Protocols
Featured in protocols.
Evidence-based stacks that include it, with the exact dose and timing each one uses.
Insulin Sensitivity and Blood Sugar Protocol
Metabolic HealthOptionalEmerging evidenceIntermediate$35-70/mo
Dose here
1-2 g (standardized aqueous extract)
Timing
Once or twice daily with carbohydrate-containing meals
Cinnamon may modestly slow gastric emptying and improve insulin signaling, with some trials showing small reductions in fasting glucose. Evidence is mixed and effects are modest, so it is included as an adjunct rather than a primary agent.1,2
Safety
Full safety detail.
Side effects
- Heartburn or stomach upset
- Mouth irritation or allergy
- Possible low blood glucose when combined with glucose-lowering agents
- Liver enzyme elevation risk from high-coumarin cassia products
Contraindications
Interactions
Interaction records.
ModerateSynergy
Alpha-Lipoic Acid
Both may support insulin sensitivity and neuropathy-related metabolic pathways.
Recommendation: Monitor glucose and symptoms of shakiness or sweating if stacked.
ModerateCaution
Green Tea Extract
Concentrated extracts can both cause GI upset, and cassia cinnamon plus high-dose EGCG may increase liver-safety concerns.
Recommendation: Prefer low-coumarin cinnamon and avoid high-dose extract stacking in liver disease.
InfoCaution
Insulin Glargine
Concentrated cinnamon extracts may modestly lower fasting or post-meal glucose in some studies. Because insulin glargine provides basal insulin exposure across the day and overnight, adding or stopping Cinnamon Extract can change glucose patterns. The main clinical concern is hypoglycemia, especially when meals, carbohydrate intake, exercise, illness, renal/hepatic function, alcohol use, or other glucose-lowering medicines are changing. This is a pharmacodynamic glucose-lowering issue; dose spacing does not reliably prevent it.
Recommendation: Do not start, stop, or substantially change Cinnamon Extract while using insulin glargine without diabetes-clinician awareness. Follow the prescribed glucose-monitoring plan and consider extra checks around fasting, bedtime, overnight-risk, illness, and activity-related readings during changes. Keep fast-acting carbohydrate available and use the hypoglycemia treatment plan; insulin adjustments should be clinician-directed. This is a pharmacodynamic glucose-lowering issue; dose spacing does not reliably prevent it.
Sources
Sources, by evidence tier.
Numbered references. Citations throughout the page link here.
Meta-analyses & systematic reviews
1- 1Cinnamon use in type 2 diabetes: an updated systematic review and meta-analysisNeeds reviewNo linkAllen RW et al. · Annals of Family Medicine · 2013
Cinnamon was associated with reductions in fasting plasma glucose and several lipid measures, while HbA1c effects were less consistent.
Randomized controlled trials
1- 2Cinnamon improves glucose and lipids of people with type 2 diabetesNeeds reviewNo linkKhan A et al. · Diabetes Care · 2003
Daily cinnamon intake was associated with lower fasting glucose, triglycerides, LDL-C, and total cholesterol in adults with type 2 diabetes.
Reference material
1- 3Coumarin in cinnamon and tonka bean extracts: its occurrence and safety assessmentNeeds reviewNo linkAbraham K et al. · Molecular Nutrition and Food Research · 2010
Coumarin exposure varies widely by cinnamon species and can exceed tolerable intakes with frequent cassia use.
Keep exploring
Deep dives & adjacent profiles.
This page is educational. Do not start, stop, or change a supplement or medication based on it without checking with a qualified healthcare professional.
Use this with your stack
Cinnamon Extract in NutriStack.
Add it to your stack, see how it interacts with everything else you take, and get a Stack Score that updates the moment it does.