Does cinnamon help with obesity? What the research does and doesn't show

The evidence doesn't support cinnamon as a weight-loss supplement for a general population. The one dedicated body-weight finding comes from a 2024 meta-analysis of 12 trials in women with PCOS, and the effect was small — about half a kilogram on average, in a population with a hormonal condition, not a general weight-loss trial.

What the evidence doesn't support

It doesn't support cinnamon as a weight-loss aid for people without PCOS — we found no trial testing cinnamon for weight loss in a general or healthy-weight population. It doesn't support a specific dose "for weight loss," since the one dedicated finding comes from a pooled analysis that doesn't break out a single dose across its 12 trials. And it doesn't support cinnamon as an addition to, or substitute for, a prescription weight-loss medication — no trial has tested that combination or comparison. Cinnamon's better-documented research is on blood sugar markers, not body weight; see cinnamon benefits: what the research does and doesn't show and does cinnamon help with diabetes? for that separate evidence, which this page doesn't repeat.

What the trials found

A 2024 meta-analysis pooled 12 randomized controlled trials of cinnamon supplementation in women with polycystic ovary syndrome (PCOS), a hormonal condition often accompanied by insulin resistance and weight gain. Body weight was one of the primary outcomes measured, and the pooled result found a statistically significant reduction versus placebo: a weighted mean difference of -0.47 kg (95% CI -0.80 to -0.15, p<0.001), with low variation between the 12 trials for this specific measure. The same trials also showed improvements in insulin resistance and fasting blood sugar — see does cinnamon help with diabetes? for those numbers. Half a kilogram is a real, statistically significant number, but it's a small one, measured only in women with PCOS taking cinnamon alongside their existing management, not a general-population weight-loss result.

Outside that PCOS-specific analysis, we didn't find a trial testing cinnamon for weight loss on its own in people without PCOS or diabetes. Whatever a product markets cinnamon for regarding weight, this is the extent of the dedicated evidence behind it.

Questions people ask

Can cinnamon supplements help with weight loss?

In women with PCOS specifically, a 2024 meta-analysis of 12 trials found a small, statistically significant weight reduction (about half a kilogram on average) alongside cinnamon supplementation. Outside that population, we found no dedicated weight-loss trial. That's a narrow, modest finding, not evidence that cinnamon produces meaningful weight loss generally.

How much cinnamon supplement should I take for weight loss?

There's no established dose for weight loss specifically. The PCOS meta-analysis above pools 12 trials without reporting one combined dose figure. Cinnamon dosage covers what trials on other outcomes have used, for context, not as a weight-loss recommendation.

Is there a best cinnamon supplement for weight loss?

The research doesn't identify one — it identifies one population-specific finding (women with PCOS) with a modest effect size, and no trial in a general population at all. There's no evidence base here to recommend one product over another for weight loss.

When to talk to a doctor

Obesity and PCOS are both medical conditions with established medical care, and cinnamon is not a substitute for either. If you have PCOS, are pursuing weight loss under medical supervision, or take a prescription weight-loss medication, ask your doctor before adding cinnamon — the combination hasn't been tested.

Related reading: cinnamon benefits: what the research does and doesn't show, does cinnamon help with diabetes?, and cinnamon dosage.