Black cohosh, an herbal supplement often used by women navigating midlife and menopause, has been the subject of discussion regarding its potential effects on liver health. As with many supplements, understanding both the intended benefits and any potential risks is an important part of making informed choices.
This article aims to provide an evidence-based overview of the relationship between black cohosh and liver health, discussing reported cases and the current scientific understanding. Our goal is to offer clear, non-hyped information to help you understand this aspect of black cohosh use.
What is Black Cohosh?
Black cohosh (Cimicifuga racemosa, also known as Actaea racemosa) is a perennial plant native to North America. Its root and rhizome have been traditionally used for various health purposes, and it is commonly found in supplements marketed for menopausal symptoms such as hot flashes and night sweats [1].
The use of black cohosh for menopausal symptoms has been explored in various studies, with an isopropanolic black cohosh extract (iCR) being a specific formulation that has been the subject of review and meta-analysis [1]. When considering any supplement, it’s helpful to be aware of the specific preparation and its documented research.
Reported Cases of Liver Health Concerns
Over the past two decades, there have been case reports and reviews that describe instances of liver injury potentially associated with black cohosh use. These reports have raised questions and prompted closer examination of the supplement’s safety profile, particularly concerning liver function [2].
Some reported cases describe various types of liver injury. For example, a case of cholestatic drug-induced liver injury (DILI) was associated with black cohosh use [3]. Other reports have described black cohosh-induced hepatitis [4] and liver injury with features mimicking autoimmune hepatitis following black cohosh use [5]. These cases highlight the diverse ways liver health concerns have been observed in individuals using black cohosh.
It is important to note that while these case reports exist, they do not definitively prove causation in every instance. However, they do contribute to a body of evidence suggesting a potential association that warrants careful consideration [6].
Exploring the Relationship: Is There a Link?
The question of a direct causal link between black cohosh and liver damage has been a topic of ongoing discussion and research. While numerous individual case reports have suggested an association [PMID 21677326, PMID 25093128], establishing definitive causation can be complex due to various factors.
One challenge in determining causation is that many individuals who use black cohosh may also be taking other medications or supplements, or have pre-existing health conditions, which could contribute to liver issues [2]. Additionally, the quality and specific constituents of black cohosh products can vary, and some products might be adulterated or mislabeled, potentially containing other substances that could affect the liver [PMID 21677326, PMID 35164202]. Some research suggests that certain fibrous roots of Cimicifuga species are at risk of hepatotoxicity [7].
Despite these complexities, histological, immunohistochemical, and electron microscopy analyses of liver biopsies from individuals with liver injury after black cohosh use have been conducted to explore potential mechanisms of hepatotoxicity [8]. These analyses aim to understand how black cohosh might impact liver cells at a microscopic level, providing further insights into the observed associations.
Evidence Strength and Nuances
The overall evidence strength regarding black cohosh and liver damage is considered moderate. This means that while there are compelling case reports and some mechanistic studies, large-scale, controlled clinical trials specifically designed to assess liver toxicity as a primary outcome are less common. The nature of case reports means they describe individual experiences, which are valuable for identifying potential risks but do not represent population-level statistics [2].
It’s also important to distinguish between different black cohosh preparations. For instance, an isopropanolic black cohosh extract (iCR) has been reviewed in meta-analyses focusing on menopausal symptoms, and these reviews often consider safety data, including liver-related adverse events [1]. However, comprehensive safety data specifically for liver health across all black cohosh products can be challenging to synthesize due to variations in product formulation and quality [9].
Some early reports of hepatotoxicity from Cimicifuga racemosa, such as a 2003 Australian case report, were later deemed not sufficiently substantiated upon closer examination [10]. This underscores the importance of rigorous evaluation of individual cases to ensure accuracy and avoid misattribution.
Sensible Precautions for Black Cohosh Use
Given the reported cases of liver health concerns, it is prudent to exercise caution and engage in informed decision-making when considering black cohosh. For individuals with existing liver conditions, or those taking other medications that impact liver function, discussing black cohosh with a healthcare professional before use is particularly important.
Monitoring for any signs of liver distress while using black cohosh is a sensible precaution. Symptoms such as unusual fatigue, dark urine, yellowing of the skin or eyes (jaundice), persistent nausea or vomiting, or abdominal pain could indicate liver issues and warrant immediate medical attention. Being aware of these potential signs can help individuals respond promptly if concerns arise.
Choosing reputable brands and products is also key. The quality and purity of herbal supplements can vary significantly, and some products may contain contaminants or different plant species than advertised, which could contribute to unexpected health effects [7]. Look for products from manufacturers with transparent quality control processes and third-party testing where available.
References
- Review & meta-analysis: isopropanolic black cohosh extract iCR for menopausal symptoms – an update on the evidence. Climacteric : the journal of the International Menopause Society, 2021
- Herb induced liver injury presumably caused by black cohosh: a survey of initially purported cases and herbal quality specifications. Annals of hepatology, 2011
- Case of cholestatic drug-induced liver injury (DILI) associated with black cohosh. BMJ case reports, 2021
- Black cohosh-induced hepatitis. Delaware medical journal, 2007
- Liver Injury with Features Mimicking Autoimmune Hepatitis following the Use of Black Cohosh. Case reports in medicine, 2009
- Black cohosh and liver toxicity: is there a relationship?. Case reports in gastrointestinal medicine, 2014
- Fibrous Roots of Cimicifuga Are at Risk of Hepatotoxicity. Molecules (Basel, Switzerland), 2022
- Mechanism of hepatotoxicity due to black cohosh (Cimicifuga racemosa): histological, immunohistochemical and electron microscopy analysis of two liver biopsies with clinical correlation. Experimental and molecular pathology, 2014
- Black Cohosh. 2012
- Hepatotoxicity from Cimicifuga racemosa? Recent Australian case report not sufficiently substantiated. Journal of alternative and complementary medicine (New York, N.Y.), 2003
These statements have not been evaluated by the Food and Drug Administration. This information is not intended to diagnose, treat, cure, or prevent any disease. Content is for informational purposes only and is not medical advice; consult a qualified healthcare provider before starting any supplement. As an Amazon Associate we earn from qualifying purchases.
