Co Voi (Vernonia cinerea): Benefits, Dosage, Safety & Evidence

Frequently asked questions

How does Co Voi (Vernonia cinerea) work to reduce inflammation?

Co Voi contains active compounds called vernolide and vernodalol, which are sesquiterpene lactones that inhibit pro-inflammatory pathways. These compounds, along with flavonoids present in the plant, appear to suppress inflammatory mediators such as cytokines and prostaglandins. The herb also demonstrates antipyretic effects, likely through modulation of hypothalamic temperature regulation. Current evidence is rated at Level C (preliminary clinical evidence), and more rigorous studies are needed to fully understand the molecular mechanisms involved.

Is Co Voi safe to take during pregnancy?

No, Co Voi (Vernonia cinerea) is contraindicated during pregnancy and should be avoided. Traditional use and available evidence indicate potential safety concerns for pregnant women. The herb contains sesquiterpene lactones, including vernolide, which may stimulate uterine contractions or affect fetal development. Women who are breastfeeding should also avoid this herb due to insufficient safety data. If you are pregnant or planning pregnancy, consult a qualified healthcare provider about safe alternatives for managing fever or inflammation.

What is the recommended dosage for Co Voi herb?

The traditional adult dosage for Co Voi (Vernonia cinerea) is 15-30 grams of fresh herb daily, typically prepared as a decoction or infusion. For dried herb preparations, use approximately one-third of the fresh amount. Dosage may vary depending on the specific condition being treated and individual factors. There is insufficient clinical evidence to establish standardized dosing protocols, so traditional preparation methods serve as primary guidance. Consult a medical herbalist or healthcare provider for personalized dosing recommendations.

Does Co Voi interact with any medications?

There is limited clinical data on drug interactions for Co Voi (Vernonia cinerea). Due to its traditional use as a diuretic for urinary conditions, it may theoretically interact with diuretic medications, potentially enhancing their effects. Patients taking anticoagulants or antiplatelet drugs should exercise caution, as some Vernonia species may affect blood clotting. Always consult a qualified healthcare provider before combining Co Voi with prescription medications. Current evidence level is C, meaning comprehensive interaction studies have not been conducted.

What conditions is Co Voi traditionally used to treat?

Co Voi (Vernonia cinerea) is traditionally used in Vietnamese medicine for reducing fever, treating urinary conditions, and managing inflammatory disorders. Common applications include urinary tract discomfort, bladder conditions, skin ailments, and general inflammation. The herb is valued for its antipyretic and anti-inflammatory properties. Practitioners may also recommend it for minor skin conditions when used appropriately. Current evidence supporting these uses is rated at Level C, indicating preliminary clinical evidence. Traditional use spans generations, but more rigorous research is needed.

PubMed-compiled information sheet

This sheet was compiled from PubMed (NIH) abstracts using AI assistance. Every factual claim is cited to a real PubMed article (see the source list). It has not yet been human-reviewed — confirm with a healthcare provider before use.

Compiled from 30 PubMed articles · model: gemma4:31b

Summary

Vernonia cinerea is a perennial herbaceous plant found in tropical regions, used traditionally to treat malaria, fever, and liver diseases [PMID:38732642].

Background

Vernonia cinerea (L.) Less. is a perennial herbaceous plant primarily distributed in tropical areas, including India, South America, and Southeast Asia [PMID:38732642].

Traditional uses

It has been used in folk medicine to treat malaria, fever, and liver diseases [PMID:38732642]. In Sri Lankan traditional medicine, it is used to treat hepatic diseases [PMID:40410750]. In Siddha Medicine, a whole plant kashayam (crude aqueous extract) is used to reverse toxic effects during cancer therapy [PMID:34012874].

Active compounds

The plant has yielded approximately 92 secondary metabolites, predominantly sesquiterpene lactones, but also includes triterpenes, flavonoids, steroids, and phenolics [PMID:38732642]. Specific isolated compounds include vernocinolide A [PMID:16319005], 3beta-acetoxyurs-19-ene and lupeol acetate [PMID:17236007], and Yexiangniuside A and B [PMID:39970992].

Mechanism of action

In obese mice, water extracts may improve insulin sensitivity by modulating the phosphatidylinositol-3-kinase (PI3K) and adenosine monophosphate-activated protein kinase (AMPK) pathways in adipose tissue, skeletal muscle, and liver [PMID:30055774]. In colorectal cancer cells, extracts may disrupt intracellular oxidative-antioxidative status by affecting the gene expression of antioxidant enzymes such as superoxide dismutase, catalase, glutathione peroxidase, and glutathione reductase [PMID:36444606]. Dichloromethane fractions have demonstrated pro-apoptotic, genotoxic, and cell cycle arrest effects in human adenocarcinoma cells [PMID:32838722].

Clinical evidence

Evidence ASmoking Cessation

A meta-analysis of five trials (347 smokers) found V. cinerea significantly associated with higher cessation rates at week 8 (RR 1.69) and week 12 (RR 2.18) [PMID:29609935]. Another systematic review of 13 RCTs from Thailand showed a risk ratio of 1.51 for cessation, though longer follow-up (≥24 weeks) showed no significant association [PMID:41076145]. An open-label RCT found no statistically significant difference in continuous abstinence rates between V. cinerea and nortriptyline at week 12 or 24 [PMID:36708558].

Evidence DNephrotoxicity

In cancer-bearing mice, crude aqueous extract and its fractions significantly reversed cisplatin-induced renal damage and regenerated tubular epithelial cells [PMID:34012874].

Evidence DInsulin Resistance

Water extract significantly reduced hyperglycemia, hyperinsulinemia, hyperleptinemia, and hyperlipidemia in high-fat diet-induced obese mice [PMID:30055774].

Safety & adverse effects

An acute toxicity study in mice using methanol extract showed a median lethal dose (LD50) greater than 2000 mg/kg with no macroscopic pathological changes [PMID:20645763].

Evidence summary

Evidence for smoking cessation is supported by systematic reviews and RCTs, though long-term efficacy is inconsistent. Other pharmacological claims (antidiabetic, renoprotective, anticancer) are primarily based on animal models or in vitro studies.

PubMed sources

1.PMID: 38732642 (2024) — Traditional Uses, Phytochemistry, and Pharmacological Activities of Vernonia cinerea (L.) Less.: An Updated Review. · Nutrients
2.PMID: 34012874 (2021) — Vernonia cinerea regenerates tubular epithelial cells in cisplatin induced nephrotoxicity in cancer bearing mice without affecting antitumor activity. · Journal of traditional and complementary medicine
3.PMID: 33728267 (2021) — Vernonia cinerea pastilles is effective for smoking cessation. · Journal of traditional and complementary medicine
4.PMID: 16319005 (2006) — Sesquiterpenoids from Vernonia cinerea. · Natural product research
5.PMID: 29609935 (2018) — Efficacy and safety of Vernonia cinerea (L.) Less. for smoking cessation: A systematic review and meta-analysis of randomized controlled trials.

Co Voi

Sources & Citations

Calculate a safe dose of Co Voi