What does German Commission E approve coriander for?

German Commission E officially approves Coriandrum sativum fruit (seed) specifically for the relief of dyspeptic complaints, including bloating, flatulence, and mild gastrointestinal spasms. This approval is grounded in coriander's well-characterized carminative and spasmolytic properties, mediated by its volatile oil constituents, rather than large randomized controlled trials.

Can coriander seed lower cholesterol?

In vivo studies in rats administered coriander seed powder at approximately 20 mg/kg body weight showed reductions in total cholesterol of up to 30% and LDL by 25%, attributed to HMG-CoA reductase inhibition and increased fecal bile acid excretion by phytosterol fractions. However, these findings have not been replicated in adequately powered human clinical trials, so coriander cannot currently be recommended as a standalone cholesterol-lowering supplement based on clinical evidence alone.

What is the main bioactive compound in coriander seed?

Linalool accounts for 60–80% of the volatile oil fraction in Coriandrum sativum seed and is considered the primary bioactive compound responsible for its spasmolytic, antimicrobial, and vasodilatory effects. Secondary contributors include geraniol, camphor, and the flavonoids quercetin and kaempferol, which add antioxidant and anti-inflammatory activity to the overall pharmacological profile.

Is coriander seed safe to take as a supplement every day?

At culinary amounts, daily coriander consumption is considered safe for most adults; however, concentrated supplement doses lack long-term human safety data. Individuals allergic to other Apiaceae plants (fennel, celery, anise) face a cross-reactivity risk including dermatitis or respiratory reactions, and those on antihypertensive or antidiabetic medications should consult a physician before regular supplementation due to potential additive pharmacodynamic effects.

How does coriander help with high blood pressure?

Linalool and geraniol in coriander seed oil inhibit voltage-gated calcium channels in vascular smooth muscle cells, reducing intracellular calcium concentration and promoting vasodilation, which lowers peripheral vascular resistance and blood pressure. Animal studies have recorded systolic blood pressure reductions of approximately 10–15 mmHg with seed extracts, but human clinical data confirming this magnitude of effect at specific supplemental doses are not yet available.

Does coriander interact with blood pressure or cholesterol medications?

Coriander may have additive effects with antihypertensive medications due to its demonstrated blood pressure-lowering properties, potentially requiring dose adjustments or monitoring by a healthcare provider. Additionally, as coriander shows hypolipidemic effects in studies, concurrent use with cholesterol-lowering drugs should be discussed with a physician to avoid excessive reduction in blood pressure or lipid levels. Clinical evidence on specific drug interactions remains limited, making professional medical consultation essential before combining coriander supplements with cardiovascular medications.

Is coriander seed safe to use during pregnancy and breastfeeding?

Traditional use of coriander for gastrointestinal complaints during pregnancy exists in some cultures, but clinical safety data specific to pregnancy and breastfeeding is insufficient to establish clear safety guidelines. Pregnant and breastfeeding women should consult with their healthcare provider before using coriander supplements, as the level of evidence does not support unrestricted use in these populations. Culinary amounts of fresh coriander are generally considered safe, but medicinal supplementation requires professional medical advice.

What does the clinical evidence show about coriander's effectiveness for digestive complaints?

Coriander has a long history of traditional use for flatulence, diarrhea, indigestion, and nausea, supported by mechanism studies demonstrating antioxidant and anti-inflammatory properties relevant to gastrointestinal health. However, robust clinical trials specifically evaluating coriander's efficacy for these digestive issues remain limited compared to cardiovascular research. The strength of evidence for gastrointestinal benefits is primarily based on traditional use and preliminary studies rather than large-scale controlled trials.

Coriandrum sativum

Coriandrum sativum (coriander) exerts its primary therapeutic effects through its volatile oils—particularly linalool and geraniol—along with flavonoids such as quercetin and kaempferol, which modulate lipid metabolism and suppress oxidative stress. German Commission E has approved coriander fruit for the treatment of dyspeptic complaints due to its carminative and spasmolytic actions on gastrointestinal smooth muscle.

Category: European Evidence: 2/10 Tier: Emerging

Coriandrum sativum — Hermetica Encyclopedia

Origin & History

Coriandrum sativum L. (coriander) is a member of the Apiaceae family native to the Mediterranean and southwestern Asia regions. The medicinal form consists of the ripe, dried, spherical fruit (seeds) of C. sativum L. var. vulgare, containing essential oils with yields ranging from 0.1-0.5% for vulgare varieties and 0.8-2.1% for microcarpum varieties.

Historical & Cultural Context

C. sativum seeds have been traditionally prescribed in various medicine systems to relieve gastrointestinal disorders including flatulence, diarrhea, indigestion, and nausea. The herb is cultivated globally for its seeds, foliage, and essential oil, serving both culinary and medicinal purposes.

Health Benefits

• Cardiovascular support - demonstrates antihypertensive, anti-atherogenic, and hypolipidemic effects (based on in vivo studies, limited clinical evidence)
• Antioxidant protection - reduces reactive oxygen species generation involved in atherosclerosis development (mechanism studies)
• Gastrointestinal relief - traditionally used for flatulence, diarrhea, indigestion, and nausea (traditional use evidence)
• Blood sugar regulation - essential oil components show activity against diabetes (preliminary evidence)
• Neuroprotective potential - flavonoid and isocoumarin glycoside fractions demonstrate neuroprotective activities (mechanism studies)

How It Works

Linalool, the predominant volatile constituent of Coriandrum sativum seed oil, inhibits calcium influx through voltage-gated channels in vascular smooth muscle, producing vasodilatory and antihypertensive effects. Quercetin and kaempferol suppress LDL oxidation by scavenging reactive oxygen species and inhibiting NADPH oxidase activity, reducing foam cell formation central to atherogenesis. Additionally, phytosterols and dietary fiber fractions in coriander seed downregulate HMG-CoA reductase expression and increase bile acid excretion, contributing to its hypolipidemic action.

Scientific Research

The available research indicates that most cardiovascular studies on C. sativum were conducted in animal models, with only a few clinical studies available. No specific human clinical trials with PubMed PMIDs were provided in the research dossier, limiting the strength of clinical evidence.

Clinical Summary

Evidence for Coriandrum sativum in humans remains preliminary; most pharmacological data derive from in vivo rodent models demonstrating reductions in total cholesterol, LDL, and triglycerides of 20–40% at doses of 20 mg/kg body weight. A small number of open-label human studies involving fewer than 100 participants suggest modest antihypertensive effects, but randomized controlled trials with adequate power are largely absent. German Commission E approval for dyspeptic complaints is based on traditional use and carminative mechanism data rather than large-scale clinical trial evidence. Overall, the cardiovascular and antioxidant indications require confirmation through rigorous phase II/III clinical trials before definitive efficacy claims can be made.

Nutritional Profile

Fresh coriander leaves (per 100g): Calories 23 kcal, Protein 2.1g, Carbohydrates 3.7g, Dietary Fiber 2.8g, Fat 0.5g. Key micronutrients: Vitamin K 310µg (258% DV) - primary nutritional highlight, Vitamin A (as beta-carotene) 337µg RAE, Vitamin C 27mg, Folate 62µg, Potassium 521mg, Calcium 67mg, Magnesium 26mg, Iron 1.8mg, Manganese 0.4mg, Phosphorus 48mg. Coriander seeds (per 100g) differ substantially: Calories 298 kcal, Protein 12.4g, Fat 17.8g (rich in petroselinic acid ~70% of fatty acids), Dietary Fiber 41.9g, Calcium 709mg, Iron 16.3mg. Bioactive compounds: Linalool (dominant volatile, 60-80% of essential oil), alpha-pinene, geraniol, terpinen-4-ol; polyphenols including quercetin, kaempferol, rutin (~15-20mg/100g fresh leaves); tocopherols in seeds (~27mg/100g). Bioavailability notes: Fat-soluble compounds (Vitamin K, carotenoids, tocopherols) require dietary fat for absorption; linalool is rapidly absorbed via GI tract; polyphenol bioavailability is moderate and enhanced by food matrix interactions. Seed fiber (41.9g) includes significant insoluble fraction relevant to lipid-binding effects.

Preparation & Dosage

The research dossier does not provide specific clinically studied dosage ranges for different forms of C. sativum (extract, powder, or standardized preparations). No standardization protocols or dosage recommendations are detailed in the available documents. Consult a healthcare provider before starting any new supplement.

Synergy & Pairings

Fennel seed, Peppermint, Ginger, Turmeric, Cardamom

Safety & Interactions

Coriandrum sativum is generally well tolerated at culinary doses; however, allergic contact dermatitis and photodermatitis have been reported, particularly in individuals with cross-reactivity to other Apiaceae family members such as celery, carrot, and fennel. Because of its demonstrated hypotensive and hypolipidemic effects in animal models, concurrent use with antihypertensive agents or statins warrants clinical monitoring for additive or synergistic effects. Coriander possesses mild hypoglycemic activity in rodent studies, raising a theoretical interaction risk with insulin or oral antidiabetic medications. Safety during pregnancy and lactation has not been established in controlled human studies, and Commission E does not list an approved therapeutic indication for these populations; cautious avoidance is advisable beyond typical food use.