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Cinnamon and LDL Cholesterol: What Does the Meta-Analysis Actually Show?

Cinnamon is often marketed as a natural way to lower "bad" LDL cholesterol. A meta-analysis of 13 randomized trials involving 750 people, however, paints a more nuanced picture than the popular belief: cinnamon significantly lowers triglycerides and total cholesterol, but its effect on LDL specifically turned out to be statistically insignificant.

PZdr Piotr ZielińskiSeptember 2, 202611 min read

Table of contents

TL;DR — key takeaways

→Cinnamon as a "natural cholesterol remedy" — where the reputation comes from
→What the 2017 meta-analysis showed
→Why supplementation duration might matter
→Why triglycerides and total cholesterol responded, but LDL didn't
→Myth vs. fact
→What's worth doing in practice
→Limitations of this evidence
→Our editorial recommendation

Cinnamon as a "natural cholesterol remedy" — where the reputation comes from

Cinnamon is one of the most popular spices linked to purported metabolic benefits — from blood glucose control to improved lipid profile. This reputation comes partly from real studies showing some effect of cinnamon on carbohydrate and lipid metabolism, and partly from a simplified popular narrative that readily rounds "some effect on certain lipid parameters" up to the blanket claim "cinnamon lowers bad cholesterol."

The problem with that simplification is that "lipid profile" isn't a single parameter — it's several distinct markers: total cholesterol, LDL, HDL, and triglycerides — each of which can respond differently to a given intervention. Treating them as one lumped "cholesterol" category leads to imprecise, sometimes simply incorrect conclusions, as the meta-analysis discussed in this article illustrates well.

What the 2017 meta-analysis showed

The effects of cinnamon supplementation on blood lipid concentrations: A systematic review and meta-analysis

Moderate evidence

Maierean SM, Serban MC, Sahebkar A et al. · Journal of Clinical Lipidology · 2017

A meta-analysis of 13 randomized controlled trials with a total of 750 participants evaluated cinnamon supplementation's effect on blood lipid parameters. No statistically significant effect of cinnamon was found on LDL cholesterol (weighted mean difference, WMD: -0.16 mmol/L [-6.19 mg/dL], 95% CI: -0.35 to 0.03; p=0.10) or HDL cholesterol (WMD: 0.05 mmol/L [1.92 mg/dL], 95% CI: -0.03 to 0.12; p=0.21). A statistically significant reduction was found, however, in triglycerides (WMD: -0.27 mmol/L [-23.91 mg/dL], 95% CI: -0.39 to -0.14; p<0.01) and total cholesterol (WMD: -0.36 mmol/L [-13.92 mg/dL], 95% CI: -0.63 to -0.09; p<0.01). In a sensitivity analysis, after removing one study, the effect on HDL became statistically significant (WMD: 0.04 mmol/L; p<0.01). Meta-regression found no association between cinnamon dose and changes in lipid parameters, but did find a significant, positive association between longer supplementation duration and changes in total cholesterol, LDL, and triglycerides.

In other words: it's not true that cinnamon has no effect on lipids at all — it does, and it's statistically significant for triglycerides and total cholesterol. But it's also not true, as the popular claim goes, that cinnamon "lowers bad LDL cholesterol" — in this particular meta-analysis, the effect on LDL, though directionally negative (pointing to a small decrease), didn't reach the threshold of statistical significance (p=0.10, against the usual threshold of p<0.05).

An honest null result is still a meaningful result

The lack of a statistically significant effect on LDL doesn't mean the study "failed" — it's specific, valuable information: the current evidence from 13 clinical trials doesn't support the popular belief that cinnamon lowers LDL, even though it does support its effect on other lipid parameters.

Why supplementation duration might matter

One of the more interesting, if less often cited, findings of this meta-analysis is the relationship between supplementation duration and the size of changes in total cholesterol, LDL, and triglycerides — longer interventions were associated with larger changes in these parameters. This doesn't automatically mean the effect on LDL would become statistically significant with a longer duration in each of the included trials, but it does suggest that differences in trial duration (from a few weeks to several months) may have partly diluted the pooled result for LDL in this specific meta-analysis.

Notably, the meta-regression found no similar dose-dependent relationship for cinnamon — suggesting that, within the dose ranges used in the included trials, dose size mattered less than duration of use, though this is a secondary observation requiring confirmation in trials specifically designed for that purpose.

Why triglycerides and total cholesterol responded, but LDL didn't

The mechanism through which cinnamon might affect lipids relates mainly to its potential impact on insulin sensitivity and glucose metabolism — improved insulin handling can indirectly lower triglyceride synthesis in the liver. This helps explain why triglycerides specifically — a parameter closely tied to carbohydrate metabolism and insulin — responded most clearly in this meta-analysis.

LDL, unlike triglycerides, depends more heavily on other metabolic pathways, including hepatic cholesterol metabolism and LDL receptor activity — pathways on which cinnamon may have a much weaker or entirely undetectable effect at the doses and durations used in available studies. This is a good illustration of why "an effect on metabolism" isn't the same as "an effect on every lipid parameter at once."

Myth vs. fact

Myth

Adding cinnamon to meals daily or drinking cinnamon tea is a scientifically confirmed way to lower bad LDL cholesterol.

Fact

The most comprehensive available meta-analysis (13 RCTs, 750 participants) found no statistically significant effect of cinnamon on LDL. Cinnamon did significantly lower triglycerides and total cholesterol, but those are different, though related, lipid parameters — treating them interchangeably with LDL is imprecise and misleading for anyone whose main goal is specifically lowering LDL.

What's worth doing in practice

Practical takeaways for people with elevated LDL

Don't rely on cinnamon as your main strategy for lowering LDL — current meta-analysis evidence doesn't support this specific effect
If your goal is lowering triglycerides or total cholesterol, cinnamon may be a reasonable, low-risk dietary addition, but not a replacement for proven interventions
The foundation for lowering LDL remains lifestyle changes with documented effectiveness: reducing saturated fat, increasing soluble fiber, regular physical activity, and, when clinically indicated, medication prescribed by a doctor
If your LDL is significantly elevated, discuss a full lipid panel and your individual cardiovascular risk with a doctor, rather than relying solely on dietary supplements
If you still want to try cinnamon, treat it as an addition potentially supporting triglycerides and total cholesterol, not a tool targeted at LDL

Limitations of this evidence

What this meta-analysis doesn't prove

The meta-analysis pooled 13 trials with varying methodology, dosing, duration, and participant populations — a typical source of heterogeneity in this kind of pooled analysis. The lack of a statistically significant effect on LDL in this particular pool of trials isn't proof "beyond doubt" that cinnamon never, under any conditions, affects LDL — it's rather a statement that the data available so far don't support claiming otherwise. Future, larger, longer-duration trials could theoretically change this picture, especially given the observed relationship between effect size and supplementation duration.

Parameter	Effect of cinnamon per the meta-analysis
LDL ("bad" cholesterol)	No statistically significant effect (p=0.10)
HDL ("good" cholesterol)	No significant effect in the main analysis (p=0.21); significant after removing one study
Triglycerides	Significant reduction (p<0.01)
Total cholesterol	Significant reduction (p<0.01)
Dose dependence	No significant association found in meta-regression
Duration dependence	Significant, positive association for total cholesterol, LDL, and triglycerides

Cinnamon and lipids at a glance

Our editorial recommendation

Cinnamon is a good example of why it's worth reading study results broken down by specific parameter, rather than trusting blanket claims like "cinnamon lowers cholesterol." The reliable data show a real, though moderate, effect on triglycerides and total cholesterol — and no confirmed effect on LDL, the parameter most often asked about in the context of cardiovascular risk.

Cinnamon isn't worthless for lipid profile — it just doesn't work where most people would expect. That distinction matters for anyone reaching for cinnamon with the specific goal of lowering LDL, rather than a general improvement in metabolic profile.

Dr. Piotr Zieliński, VitMode editorial team

Frequently asked questions

It does have an effect, but a selective one — the meta-analysis of 13 trials found a statistically significant reduction in triglycerides and total cholesterol, but no significant effect on LDL. This distinction is key, since these parameters, though related, aren't interchangeable.

This likely stems from oversimplifying and blending different lipid profile parameters into one "cholesterol" category. The real, documented effect of cinnamon concerns mainly triglycerides and total cholesterol, not specifically LDL — a distinction that often gets lost in popular, simplified messaging.

The included trials varied in dosing, and meta-regression found no significant association between dose size and changes in lipid parameters — suggesting that, within the tested dose range, the amount of cinnamon mattered less than how long it was used.

The meta-analysis found a significant, positive association between supplementation duration and changes in LDL, total cholesterol, and triglycerides, which suggests this possibility. This is, however, a secondary observation from meta-regression, not the result of a dedicated trial directly testing long-term supplementation for LDL specifically.

In typical culinary amounts, cinnamon is generally considered safe. It's worth knowing, though, that some cinnamon varieties (cassia) contain coumarin, which in large doses can stress the liver, so for regular, high-dose supplementation it's worth choosing Ceylon cinnamon and not exceeding reasonable amounts.

The best-documented strategies for lowering LDL are reducing saturated and trans fats in the diet, increasing soluble fiber intake, regular physical activity, maintaining a healthy body weight, and, for significantly elevated cardiovascular risk, medication prescribed by a doctor.

It's a meta-analysis of 13 randomized controlled trials covering 750 participants, published in a peer-reviewed scientific journal (Journal of Clinical Lipidology) — one of the more comprehensive analyses available on this topic, though, like any meta-analysis, it's limited by the quality and heterogeneity of the trials that make it up.

Sources

Maierean et al. 2017 — Journal of Clinical Lipidology

PZ

dr Piotr Zieliński

Specialist physician in endocrinology, scientific consultant

Piotr reviews content on hormones, metabolic health and supplement pharmacology.

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Comments (2)

KW
Kasia W. 2 weeks ago
Very clearly explained, especially the interactions section — I hadn't seen it laid out this well anywhere else.
MT
Marek T. a month ago
Are you planning to update this with the newest study from this year? I saw an interesting meta-analysis.