Cardamom Seed Essential Oil
Also known as: Green cardamom, Cardamom seed essential oil, Elettaria cardamomum
Overview
Cardamom seed essential oil is derived from the seeds of Elettaria cardamomum (L.) Maton, primarily through steam distillation. It is rich in bioactive compounds such as 1,8-cineole, α-terpinyl acetate, α-pinene, and various phenolic compounds. Traditionally valued as a spice and in traditional medicine, this essential oil is now being investigated for its potential anti-inflammatory, antihypertensive, metabolic, antimicrobial, and antioxidant properties. Research into its therapeutic effects is moderately mature, with several randomized controlled trials (RCTs) and systematic reviews available, particularly focusing on cardiovascular and inflammatory outcomes. The overall evidence quality is moderate, though some variability exists in study designs and populations.
Benefits
Cardamom seed essential oil demonstrates several evidence-based benefits. Primary effects include a modest but statistically significant reduction in blood pressure, with meta-analyses showing a decrease of approximately 0.9 mmHg in diastolic blood pressure (DBP) and 0.54 mmHg in systolic blood pressure (SBP) in adults with metabolic syndrome or hypertension. It also exhibits significant anti-inflammatory effects, reducing markers like high-sensitivity C-reactive protein (hs-CRP) and interleukin-6 (IL-6). Secondary benefits, largely from animal studies, include metabolic modulation, where it may increase energy expenditure and reduce fat mass by influencing the hypothalamic-pituitary-thyroid (HPT) and hypothalamic-pituitary-adrenal (HPA) axes. Additionally, it shows antimicrobial activity against various pathogens and enhances antioxidant enzyme activities. Most human trials have been conducted in adults with metabolic syndrome or hypertension, predominantly in Iranian populations, with interventions lasting 8 to 16 weeks.
How it works
The therapeutic effects of cardamom essential oil are attributed to its bioactive compounds, such as 1,8-cineole and terpinyl acetate. These compounds exert antioxidant and anti-inflammatory actions by modulating cytokine expression (e.g., IL-1β, IFN-γ) and reducing oxidative stress markers like malondialdehyde (MDA) and nitric oxide (NO). Its influence on cardiovascular regulation may involve vasodilation and the modulation of inflammatory pathways. Metabolic effects are thought to be mediated through central nervous system regulation of appetite and energy expenditure, involving the HPT and HPA axes. The essential oil is absorbed via the gastrointestinal tract, though detailed human pharmacokinetic data are limited, and bioavailability can vary based on preparation and co-administration.
Side effects
Cardamom seed essential oil appears generally safe when consumed at doses up to 3 g/day of green cardamom powder equivalent, as observed in human clinical trials. Mild gastrointestinal discomfort is a potential, though not well-documented, side effect. Robust clinical data on significant drug interactions or contraindications are currently lacking. However, due to insufficient research, its safety in special populations such as pregnant women and children cannot be conclusively determined. Long-term safety data beyond 16 weeks of supplementation are also limited, warranting caution with prolonged use.
Dosage
Based on clinical trials, an effective dose for blood pressure and inflammation effects is approximately 3,000 mg/day of green cardamom powder or an equivalent extract. For the essential oil specifically, optimal dosing is less defined, but extrapolations from animal studies suggest a daily intake of 76.9–308.4 mg of bioactives, which corresponds to 14.5–58.3 g of cardamom seeds. Clinical interventions typically range from 8 to 16 weeks. The timing of administration is not strictly defined, but the form of the supplement (powder versus essential oil) can impact absorption. Essential oil is generally recommended to be taken in encapsulated or highly diluted forms to prevent potential mucosal irritation.
FAQs
Is cardamom seed essential oil effective for lowering blood pressure?
Yes, it shows a modest but statistically significant effect on lowering blood pressure, particularly diastolic, and is best used as part of a comprehensive lifestyle approach.
Are there anti-inflammatory benefits?
Yes, studies indicate that cardamom can reduce inflammatory markers such as C-reactive protein (CRP) and interleukin-6 (IL-6) in individuals with metabolic syndrome.
How long does it take to see effects?
Clinical benefits, such as blood pressure reduction and anti-inflammatory effects, have typically been observed after 8 to 16 weeks of consistent supplementation.
Is it safe for daily use?
Current evidence supports the safety of cardamom at studied doses for periods up to 16 weeks. However, long-term safety data for daily use are still limited.
Research Sources
- https://pmc.ncbi.nlm.nih.gov/articles/PMC10804083/ – This systematic review and meta-analysis of 8 RCTs (n=769) found that cardamom significantly reduced DBP by 0.9 mmHg and SBP by 0.54 mmHg, along with anti-inflammatory effects. The study noted moderate heterogeneity in SBP results and that all included studies were from Iran, suggesting a need for broader geographic research.
- https://onlinelibrary.wiley.com/doi/abs/10.1002/ptr.7648 – This systematic review and meta-analysis of 8 RCTs (n=595) confirmed significant reductions in DBP, hs-CRP, and IL-6 in patients with metabolic syndrome. It found no significant effect on SBP and highlighted small sample sizes per trial and some heterogeneity as limitations. The study supports the anti-inflammatory and DBP-lowering effects of cardamom.
- https://msptm.org/files/Vol40No4/tb-40-4-011-Abdullah-D-Alanazi.pdf – This experimental animal study in mice demonstrated that cardamom essential oil reduced inflammatory cytokines and oxidative stress markers, and exhibited antimicrobial activity against pathogens. While providing mechanistic insights, its findings are limited by being an animal model and lack direct human clinical relevance.
- https://pmc.ncbi.nlm.nih.gov/articles/PMC9960522/ – This animal study focused on metabolic effects, showing that chronic cardamom seed intake in mice increased energy expenditure and reduced fat mass through neuroendocrine modulation. The study supports potential metabolic benefits but, as an animal model, its findings require human validation for clinical applicability.
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