In a randomized controlled trial published in 2017, women who took 3 grams of cardamom every day for 8 weeks ended the study with lower high-sensitivity C-reactive protein and lower malondialdehyde, two of the most-cited markers used to track silent inflammation and oxidative damage.1 The participants were overweight, pre-diabetic, and otherwise unremarkable. They didn’t change their diets. They didn’t start exercising. They just swallowed a small daily dose of a spice most people already have in a kitchen drawer.
That study, run by Kazemi and colleagues at Shahid Beheshti University in Tehran and printed in the Journal of the Science of Food and Agriculture, is the seed of nearly every “cardamom for stress” headline that’s bounced around social media since.1 The honest version of the story is more interesting than the headline, and a little less tidy.
What the 8-week trial actually measured
Kazemi’s team enrolled 80 women with overweight or obesity, elevated lipids, and pre-diabetes. Half got 3 grams of green cardamom powder daily, split into capsules. Half got a placebo. After 8 weeks the cardamom group showed a drop in hs-CRP, the inflammation marker your doctor uses to flag low-grade systemic inflammation, and a drop in malondialdehyde, a byproduct of oxidative damage to cell membranes.1 Fasting blood sugar and HbA1c moved a little too, though those changes were smaller and less consistent.
Three grams isn’t a culinary pinch. It’s roughly a teaspoon of ground green cardamom, or the contents of about 15 to 20 pods. That’s more than most people put in a chai. It’s the kind of dose you’d hit only if you were intentionally supplementing.
The trial wasn’t perfect. It was small. It was run in one city. The participants were all women in a specific metabolic state. Generalizing it to “cardamom calms your brain” is a leap the data doesn’t support. But the biomarker changes were real and statistically significant, and they’ve held up in subsequent reviews of the spice.
Why does cardamom seem to lower inflammation?
Green cardamom (Elettaria cardamomum) is rich in 1,8-cineole, alpha-terpinyl acetate, flavonoids, and polyphenols. In cell and animal studies these compounds bind to and quiet down the same molecular pathways that a course of low-dose aspirin tugs on, including NF-kB signaling and the production of pro-inflammatory cytokines like TNF-alpha and IL-6.2 The effect in a petri dish is much larger than the effect you’d get from a teaspoon. Translating cellular biochemistry to the human body almost always involves a steep dose discount.
That said, the dose discount in cardamom’s case isn’t zero. A 2022 randomized trial in women with polycystic ovary syndrome found that 3 grams of green cardamom daily for 16 weeks, alongside a low-calorie diet, lowered the expression of inflammatory genes including TNF-alpha and IL-6 measured directly in blood cells.3 So the spice isn’t just nudging a bloodstream marker downstream. It appears to reach into the genetic switchboard upstream of that marker, at least in this population.
The story isn’t only about inflammation. A 2023 trial in patients with metabolic syndrome reported that green cardamom supplementation reduced systolic and diastolic blood pressure modestly while also reducing CRP.4 A 2016 study by Azimi and colleagues had hinted at the same blood-pressure effect a decade earlier in adults with type 2 diabetes, although that trial was complicated by also testing cinnamon, saffron, and ginger in parallel.5
Does cardamom lower cortisol? The honest answer
Here’s where social-media wellness writing usually loses its footing. You’ll see claims that cardamom directly knocks down cortisol, the so-called “stress hormone,” and that this is why your nervous system relaxes after a cup of cardamom tea.
The peer-reviewed human evidence on cortisol specifically is thin. There are animal studies that show cortisol-equivalent effects in rats, and there are reviews that group cardamom with other anti-stress botanicals, but a well-powered randomized trial in humans showing cardamom lowers serum or salivary cortisol is, as of this writing, hard to find. It might exist tomorrow. It doesn’t dominate the evidence base today.
What the evidence does support is that chronic systemic inflammation is one of several biological pathways that can amplify the felt experience of stress, fatigue, and low mood. Lowering inflammation by any reasonable means, including a small daily intake of an anti-inflammatory spice, may help on the margin. Calling that “changing your brain hormones” is a stretch the science can’t yet underwrite. The original Facebook post that prompted this article actually flagged this same gap, telling readers, “the peer-reviewed research in humans measuring cortisol specifically is limited.” That hedging was right.
What a 2024 meta-analysis added
In 2024 a meta-analysis pooling cardamom trials and looking at cardiovascular metabolic biomarkers reported that cardamom supplementation was associated with statistically significant improvements in CRP, fasting blood glucose, and triglycerides across pooled adult populations.6 A separate 2020 meta-analysis on lipids alone found that cardamom modestly lowered triglycerides without much movement on LDL or HDL.7 A 2024 review focused specifically on inflammation and blood pressure echoed the CRP-lowering signal and added a small but consistent reduction in systolic blood pressure.8
None of these reviews call cardamom a treatment. They call it an adjunct, the kind of small lever that can shift average risk markers in a population if you stack enough of them. That’s a different claim than “drink this and feel calmer.” It’s also a sturdier claim, because it’s the one the data actually supports.
How much, how often, in what form
The trials that produced positive biomarker changes used 3 grams of green cardamom powder daily, divided into capsules taken with meals.1,3 If you’d rather get cardamom from food and tea than from capsules, the math gets fuzzier. A typical chai recipe uses 2 to 4 pods per cup, which delivers somewhere between 0.2 and 0.4 grams of seed by weight. To hit the trial dose through tea alone you’d need roughly six to ten cups, which is impractical and probably unwise given the caffeine that often rides along.
A more realistic plan, if you want to see whether cardamom does anything for you, is a single concentrated cup in the morning (4 to 6 lightly cracked pods, simmered in water for 5 minutes) plus a teaspoon of freshly ground green cardamom worked into food across the day. Yogurt, oatmeal, baked apples, lentil dal, basmati rice, and dark coffee all take cardamom well. The flavor is intense. Start small.
Black cardamom is a different species (Amomum subulatum) and has a smoky, almost camphor-like profile. Most of the inflammation research is on green cardamom, so if you’re trying to mirror what the trials did, buy green pods or freshly ground green cardamom and store them sealed in the dark. Pre-ground cardamom that’s been sitting on a supermarket shelf for a year has lost most of the volatile oils that drive the biological effects.
Who should be cautious
Cardamom is generally well tolerated at culinary doses. At supplemental doses (3 grams daily and up) a few cautions are worth naming. People on blood pressure medication should know that cardamom may add a small extra blood-pressure-lowering effect.4 If you already run on the low end, that combination can leave you light-headed when you stand. Pregnant women have used cardamom in food for centuries without obvious problems, but supplemental doses haven’t been studied in pregnancy and aren’t worth the unknown.
People with gallstones should be more careful. Cardamom can stimulate bile flow, which is helpful for digestion but uncomfortable if a stone is sitting in the wrong place. And anyone on prescription anticoagulants should mention cardamom supplementation to their doctor before starting it, because some plant polyphenols modestly affect platelet function.
Allergic reactions to cardamom exist but are rare. If you’re allergic to ginger or turmeric, both of which sit in the same botanical neighborhood, treat your first cardamom dose like a small experiment. Take a quarter-teaspoon, wait an hour, watch for itching around the lips or any tightness in the throat. If nothing happens, work up from there.
One more practical note. Cardamom in capsule form is shelf-stable for a year or two, but ground cardamom in a jar starts losing the volatile aromatic compounds within weeks once it’s been opened. If you want the biological effect that the trials measured, the freshness of the spice matters. Whole pods kept in a sealed glass jar in a dark cupboard hold their potency the longest. Crack them with the side of a knife the morning you use them.
It is not just one study
If the cardamom literature were one trial, you could ignore it. Anyone who’s followed nutrition research for a few years knows that single positive trials often don’t replicate. What’s notable about cardamom is that the same direction of effect (lower inflammation, modest improvements in cardiovascular biomarkers) keeps showing up across different populations and study designs. Pre-diabetic women in Iran. Adults with metabolic syndrome. Women with PCOS on a calorie-restricted diet. Pooled adults in meta-analyses.1,3,4,6,8
The size of the effect isn’t dramatic. CRP drops by a fraction of a milligram per liter. Triglycerides come down by a small percentage. Blood pressure shifts by a few millimeters of mercury. None of those numbers will rescue someone whose health is on fire. They are also exactly the kind of numbers that, stacked across a decade and across a few good habits, change the slope of a person’s risk curve.
Common questions about cardamom and stress
Does cardamom tea actually relax you?
Many people report a settling effect after a hot cup, but it’s hard to separate the warm-drink ritual, the aromatic compounds in the steam, and any direct biological effect. Controlled trials of cardamom on subjective stress in humans are rare and small. A relaxing cup of cardamom tea is a real experience. A relaxing cup of cardamom tea acting through a measured cortisol drop is not yet well established.
How long until the trial-level effects show up?
The published RCTs that found significant biomarker changes ran for 8 to 16 weeks at 3 grams daily.1,3 If you’re expecting to feel anything by day 3, you’re going to be disappointed. Inflammation markers move slowly.
Capsules or whole pods?
Trials used powdered green cardamom in capsules to standardize the dose. For everyday use whole pods are more flavorful and the volatile oils survive longer. Capsules are easier if you’re trying to mimic the studies.
Can I take it with my coffee?
Yes. A few crushed green pods simmered with coffee grounds is a Middle Eastern tradition that long predates anybody’s CRP measurement. There’s no known meaningful interaction between cardamom and caffeine.
What if I have type 2 diabetes?
Some trials have shown small improvements in fasting glucose and HbA1c with cardamom supplementation in this population.1,6 The improvements are not large enough to replace medication. They are large enough that you should mention any new daily supplement to your doctor so glucose monitoring can be adjusted if needed.
Where this leaves you
Cardamom won’t rewire your brain. It won’t drain your cortisol. The most defensible claim, the one supported by a chain of randomized trials and a couple of meta-analyses, is that a daily dose lowers low-grade inflammation a little, nudges blood pressure and triglycerides downward, and might help on the margin if you’re already paying attention to sleep, movement, and food. That’s a smaller promise than the captions on social media tend to make. It’s also a more believable one.
The Kazemi trial that started this whole thread of conversation didn’t ask whether cardamom feels good. It asked whether a measurable inflammatory marker would shift. It did, by enough to publish, in 8 weeks, at 3 grams a day, in 80 people who weren’t doing anything else differently. If you want to copy that and see what happens in your own body, the protocol is right there. If you’d rather just enjoy the spice, that’s also fine. The science doesn’t require you to medicalize your morning chai to count it as a small good thing.
Sources
- Kazemi S, et al. Cardamom supplementation improves inflammatory and oxidative stress biomarkers in hyperlipidemic, overweight, and obese pre-diabetic women: a randomized double-blind clinical trial. J Sci Food Agric. 2017. PubMed: 28480505
- Azimi P, et al. Effect of cinnamon, cardamom, saffron and ginger consumption on blood pressure and a marker of endothelial function in patients with type 2 diabetes mellitus. Blood Press. 2016. PubMed: 26758574
- Cheshmeh S, et al. Green cardamom plus low-calorie diet can decrease the expression of inflammatory genes among obese women with polycystic ovary syndrome. Eat Weight Disord. 2022. PubMed: 34057705
- Izadi B, et al. The effect of green cardamom on blood pressure and inflammatory markers among patients with metabolic syndrome and related disorders. Phytother Res. 2023. PubMed: 36181264
- Azimi P, et al. Effects of Cinnamon, Cardamom, Saffron, and Ginger Consumption on Markers of Glycemic Control. Rev Diabet Stud. 2014. PubMed: 26177486
- Zhang X, et al. Cardamom consumption may improve cardiovascular metabolic biomarkers in adults: a systematic review and meta-analysis. Nutr Res. 2024. PubMed: 38593657
- Shekarchizadeh-Esfahani P, et al. Effects of cardamom supplementation on lipid profile: a systematic review and meta-analysis of randomized controlled clinical trials. Phytother Res. 2020. PubMed: 31755188
- Heydarian A, et al. Effect of cardamom consumption on inflammation and blood pressure in adults: a systematic review and meta-analysis. Food Sci Nutr. 2024. PubMed: 38268891
