Coriander
A culinary spice (seeds) and herb (cilantro leaves) with a long tradition as a digestive carminative. Real but modest evidence for IBS adjunct use (as part of a mixed product), mild blood-sugar support in preclinical models, and possible mild anxiolytic activity. 'Heavy metal chelation' claims rest mostly on mouse studies and lack controlled human evidence.
Quick decision guide
May help most
Culinary use, mild digestive support (gas, bloating), and as a flavorful source of vitamin K, vitamin A, and folate (cilantro leaves).
Common dosing range
Culinary: a few grams of seeds or a small handful of fresh cilantro leaves daily. Therapeutic studies: 1–3 g/day coriander seed powder or extract for digestive or glycemic studies.
When to expect effects
Hours for digestive comfort; weeks for any glycemic effect in studies; no validated systemic effect from culinary doses.
Watch out for
Cilantro tastes like soap to ~10–15% of people due to OR6A2 olfactory receptor variants — this is genetic, not psychological. Asteraceae-cross-allergic individuals can occasionally react. Don't rely on cilantro for heavy-metal detox without clinician-directed testing.
Evidence snapshot
What is it
Coriander (Coriandrum sativum) is a culinary herb whose leaves are sold as cilantro and whose dried seeds are used as a spice. Both are used as food and traditional digestive remedies.
Is it worth it for you?
Use this as a quick fit check, not a diagnosis.
Worth considering if…
Probably skip if…
Evidence at a glance
| Goal | Effect | Best fit | Time |
|---|---|---|---|
Digestive comfort (carminative use) Limited Evidence | Subjective reduction in gas and bloating in traditional use; combination-product IBS data show benefit but coriander's specific share is unclear | Adults with mild functional bloating or gas; people who enjoy coriander-seasoned foods culinarily | Within hours after the meal (traditional carminative timing); 4–8 weeks for IBS adjunct studies |
Mild anxiety (single small RCT) Limited Evidence | Reduction in Hamilton Anxiety scale scores in a 6-week pilot trial; effect size modest, single-center | Adults with mild non-clinical anxiety symptoms looking for a low-cost botanical to try alongside lifestyle measures | ≥6 weeks in the published trial |
Blood sugar and lipid support (preliminary) Mixed Evidence | Significant fasting-glucose and triglyceride reductions in diabetic rats; pilot human data suggest modest effects, controlled RCTs lacking | Adults curious about a culinary adjunct; not a substitute for diet, exercise, metformin, or glycemic monitoring | Weeks in pilot human studies; 30 days in rat models |
Heavy metal chelation (cilantro) Mixed Evidence | No demonstrated effect in controlled human studies | None — for confirmed metal poisoning, see a clinician or medical toxicologist for evidence-based chelation | Not established for any clinical endpoint |
Digestive comfort (carminative use)
- Effect
- Subjective reduction in gas and bloating in traditional use; combination-product IBS data show benefit but coriander's specific share is unclear
- Best fit
- Adults with mild functional bloating or gas; people who enjoy coriander-seasoned foods culinarily
- Time
- Within hours after the meal (traditional carminative timing); 4–8 weeks for IBS adjunct studies
Mild anxiety (single small RCT)
- Effect
- Reduction in Hamilton Anxiety scale scores in a 6-week pilot trial; effect size modest, single-center
- Best fit
- Adults with mild non-clinical anxiety symptoms looking for a low-cost botanical to try alongside lifestyle measures
- Time
- ≥6 weeks in the published trial
Blood sugar and lipid support (preliminary)
- Effect
- Significant fasting-glucose and triglyceride reductions in diabetic rats; pilot human data suggest modest effects, controlled RCTs lacking
- Best fit
- Adults curious about a culinary adjunct; not a substitute for diet, exercise, metformin, or glycemic monitoring
- Time
- Weeks in pilot human studies; 30 days in rat models
Heavy metal chelation (cilantro)
- Effect
- No demonstrated effect in controlled human studies
- Best fit
- None — for confirmed metal poisoning, see a clinician or medical toxicologist for evidence-based chelation
- Time
- Not established for any clinical endpoint
Evidence for 4 uses
AI-assisted evidence assessment — talk to your doctor before relying on any single supplement.
Digestive comfort (carminative use)
Supplement benefitCoriander seed has been used for centuries as a digestive carminative — to reduce gas, bloating, and post-meal discomfort. Mechanism is attributed to volatile oils (linalool predominant in seeds) with mild antispasmodic effect on smooth muscle in animal models. Modern human evidence is limited to combination products. Vejdani et al. 2006 (Carmint — peppermint + lemon balm + coriander) showed reduced abdominal pain and bloating in IBS, but coriander's isolated contribution can't be separated from the other herbs.
Bottom line: Pleasant culinary herb with a long traditional pedigree; worth trying for mild bloating, but don't expect it to outperform peppermint oil or proven IBS therapies.
Mild anxiety (single small RCT)
Supplement benefitA 2018 small randomized trial (Iran, PMID 30568717) found coriander seed hydroalcoholic extract 1 g/day for 6 weeks reduced Hamilton Anxiety scale scores vs placebo in patients with mild-to-moderate anxiety. The trial is small, single-center, and short — encouraging but not yet generalizable. Mechanism is suggested to involve GABAergic modulation seen in animal studies.
Bottom line: Single small RCT — promising but needs replication. Not a substitute for proper anxiety care.
Blood sugar and lipid support (preliminary)
Coriander seed extracts reduce fasting glucose and triglycerides in diabetic-rat models (Aissaoui 2011 PMID 21420471, Eidi 2009, and several similar studies). Mechanism includes alpha-amylase inhibition and pancreatic beta-cell support in vitro. Human translation is sparse: a few small open-label or pilot trials report modest fasting-glucose drops at 1–3 g/day coriander seed for 8–12 weeks, but the trials are small (n<50), short, and not placebo-controlled. The evidence is suggestive, not conclusive.
Bottom line: Promising mechanism, weak human evidence. Use it as a flavor, not a treatment.
Heavy metal chelation (cilantro)
The popular claim that cilantro chelates heavy metals (mercury, lead, aluminum) traces to a series of mouse studies in the 1990s and one observational case series. Controlled human evidence demonstrating that cilantro reduces body burden of toxic metals does not exist. For confirmed heavy-metal poisoning, the evidence-based treatments are pharmaceutical chelators (DMSA, DMPS, EDTA, dimercaprol), administered under medical supervision with monitoring. Self-administered cilantro 'detox' protocols don't replace these and can delay proper care.
Bottom line: Don't use cilantro as a metal-detox protocol. If you're concerned about exposure, ask a clinician for a serum or urine heavy-metal test.
Evidence is mixed
Marketing claims significantly outrun the human evidence. Mouse-data extrapolation, single-case reports, and theoretical mechanisms are presented as if proven. Pharmaceutical chelation is the standard of care for confirmed poisoning.
How it works
How to take it
What to track
Bottom line: Use as a culinary herb and spice for nutrient density and digestive comfort. Don't expect it to meaningfully treat blood sugar, anxiety, or metal exposure — use proven options for those.
5 commercial forms
Compare the main delivery options and what they’re best suited for.
Whole coriander seeds (spice)
Most flavorfulRound, tan seeds with a citrusy-warm aroma. Toast lightly and grind just before use for maximum flavor. Standard form in Indian, Middle Eastern, and Latin cooking. Long shelf life if kept whole and dark.
Aromatic compounds degrade rapidly once ground.
Ground coriander seed powder
ConvenientPre-ground spice for cooking. Loses volatile aromatics within 6–12 months of grinding. Convenient for everyday cooking; replace older jars to keep flavor.
Less aromatic than freshly ground.
Fresh cilantro leaves
Vitamin K, A, folate denseBright-green herb commonly used as a garnish in Mexican, Vietnamese, Thai, and Indian cuisines. Very high in vitamin K (310 µg per 100 g), vitamin A, and folate. Add at the end of cooking to preserve volatile aromatics — heat dissipates them.
Fresh form preserves nutrients best.
Coriander seed essential oil
ConcentratedSteam-distilled volatile oil, primarily linalool. Used in aromatherapy and as a flavor concentrate in food manufacturing. NOT for undiluted ingestion or topical application without proper dilution. A few drops in a carrier oil for topical use; not for internal use.
Highly concentrated; respect dilution guidelines.
Coriander seed extract (capsules)
Research useStandardized extract used in pilot trials for glycemia and anxiety. Limited consumer use; if buying, look for stated extract ratio and standardization to linalool or essential-oil content.
Limited consumer track record.
Safety
Know the common side effects, key cautions, and who should avoid it.
Common side effects
Serious risks
Allergic reactions in people sensitized to Apiaceae family plants (carrots, celery, parsley, dill, fennel, anise) — cross-reactivity is documented. Reactions range from oral allergy syndrome to anaphylaxis in rare cases.
Photosensitivity from high topical exposure to coriander essential oil (uncommon at culinary use); skin contact dermatitis with high-concentration topical preparations.
Who should avoid it
- People with documented allergy to Apiaceae family plants (carrots, celery, parsley, dill, fennel, anise).
- Anyone using high-dose extracts alongside diabetes or blood pressure medications without clinician guidance — additive hypoglycemic or hypotensive effects are theoretical but possible.
Pregnancy & breastfeeding
Culinary use of cilantro and coriander seed is considered safe in pregnancy. High-dose extracts and essential oil should be avoided in pregnancy due to insufficient safety data and theoretical uterine effects from older herbal sources. Coriander seed is a common culinary spice across many cuisines used by pregnant women without observed harm.
Bottom line: Safe in culinary amounts for almost everyone. High-dose extracts deserve caution in Apiaceae-allergic individuals and pregnant women.
Interactions
Theoretical additive hypoglycemic effect from high-dose coriander seed extract; clinically meaningful interaction unlikely from culinary use. Monitor blood sugar if combining therapeutic-dose extract with active diabetes therapy.
Animal data suggest coriander may modestly lower blood pressure; theoretical additive effect with antihypertensives at high extract doses.
Cilantro leaves are very high in vitamin K (310 µg per 100 g, ~258% DV); large dietary swings could affect warfarin dosing. Keep cilantro intake consistent if on warfarin and monitoring INR.
Food sources
| Food | Amount | %DV |
|---|---|---|
| Cilantro (coriander leaves), raw | 100 g (vitamin K 310 µg) | 258% |
| Coriander seed, ground | 1 tsp / 1.8 g (manganese 0.03 mg) | 2% |
| Cilantro leaves, raw | ¼ cup / 4 g (vitamin K 12 µg) | 10% |
| Coriander seed, ground | 1 tsp / 1.8 g (iron 0.29 mg) | 2% |
| Cilantro leaves, raw | 100 g (vitamin A 6,748 IU) | 135% |
| Cilantro leaves, raw | 100 g (folate 62 µg DFE) | 16% |
| Cilantro leaves, raw | 100 g (vitamin C 27 mg) | 30% |
Cilantro (coriander leaves), raw
- Amount
- 100 g (vitamin K 310 µg)
- %DV
- 258%
Coriander seed, ground
- Amount
- 1 tsp / 1.8 g (manganese 0.03 mg)
- %DV
- 2%
Cilantro leaves, raw
- Amount
- ¼ cup / 4 g (vitamin K 12 µg)
- %DV
- 10%
Coriander seed, ground
- Amount
- 1 tsp / 1.8 g (iron 0.29 mg)
- %DV
- 2%
Cilantro leaves, raw
- Amount
- 100 g (vitamin A 6,748 IU)
- %DV
- 135%
Cilantro leaves, raw
- Amount
- 100 g (folate 62 µg DFE)
- %DV
- 16%
Cilantro leaves, raw
- Amount
- 100 g (vitamin C 27 mg)
- %DV
- 30%
Choosing a product
What to look for on the label — and what to be skeptical of.
Look for…
Be skeptical of…
Frequently asked questions
Are cilantro and coriander the same?⌄
Same plant (Coriandrum sativum). In the US 'cilantro' is the fresh leaf and 'coriander' is the dried seed. In the UK and elsewhere both are usually called coriander.
Why does cilantro taste like soap to me?⌄
About 4 to 14 percent of people have variants of the OR6A2 olfactory receptor gene that make cilantro's aldehydes taste soapy. It is genetic, not bias.
Does cilantro detox heavy metals?⌄
Evidence is very weak, based mostly on one small case series. Cilantro is not a reliable chelator. If you have a real heavy metal concern, see a clinician.
References by claim
Interaction: warfarin and other anticoagulants (cilantro leaves)
USDA FoodData Central — Cilantro (coriander leaves, raw) — USDA (2024) link
Digestive comfort (carminative use)
Blood sugar and lipid support (preliminary)
Aissaoui et al., 2011 — Coriander seed extract on lipids and glucose — PubMed — J Ethnopharmacol (2011) link
Mild anxiety (single small RCT)
Mahmoudpour et al., 2018 — Coriandrum sativum for anxiety — PubMed — Iran J Pharm Res (2018) link
Heavy metal chelation (cilantro)
Sears, 2013 — Chelation therapy for heavy metal toxicity — PMC — ScientificWorldJournal (2013) link
Track Coriander with Pilora
Set up dose reminders, check interactions, and join the community in the Pilora iPhone app.
Coming to App StoreDisclaimer: These statements have not been evaluated by the FDA. This page is educational, not a substitute for personalized medical advice. Evidence grades are AI-assisted assessments — talk to your doctor before starting any new supplement, especially if you’re pregnant, breastfeeding, on medications, or managing a chronic condition.