Study
Black Cohosh and Heart Health: Important Considerations for Seniors
Black cohosh may cause slower heart rates in some seniors, highlighting the need for careful monitoring.
Summary
In plain language
Researchers have found that black cohosh, a popular herbal remedy for menopausal symptoms, may be linked to slow heart rates, known as bradycardia, in some seniors. This study presented a case of a 76-year-old woman who experienced bradycardia after taking black cohosh for menopausal hot flashes. Her symptoms improved after stopping the herbal supplement. This finding is important for seniors considering or currently using black cohosh, as it underscores the need for awareness of potential heart-related side effects. Seniors should discuss the use of any herbal supplements with their healthcare providers to ensure safe and effective management of their health.
Details
Use the full description to understand the study design, methods, and the limits of the findings.
A closer look at what this report found and what it may mean for you:
Study design (in simple terms): This was a single-patient “case report.” Doctors carefully described one woman’s symptoms, testing, hospital monitoring, and what happened after black cohosh was stopped.
Key findings (with numbers): Her heart rate was 51 beats/min on arrival, 47 on ECG, and heart monitoring showed drops into the 30s for up to about one minute (mostly at night). After black cohosh was held, her baseline heart rate improved into the 60s and she did not need a pacemaker.
Important caveats: Because this is only one case, it cannot prove black cohosh always causes slow heart rate. Other factors (age, other medications, and overall health) may have contributed. Still, the timing—improvement after stopping the supplement—raises concern.
Practical implications for daily life: If you take black cohosh (or any supplement), keep a current list for every medical visit. Seek urgent care for fainting, new dizziness, unusual fatigue, chest discomfort, or a very slow pulse. Be extra cautious if you have heart disease, a history of fainting, or take blood pressure/heart medicines.
Always talk with your healthcare provider before starting, stopping, or restarting black cohosh—especially if you’ve had dizziness, fainting, palpitations, or any heart rhythm concerns.
Full Study
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Black Cohosh and Heart Health: Important Considerations for Seniors
Published February 2026
Opens at the publisher · external site · may require institutional access
Research Quality Score
Assessment
Methodologically, this is low-level evidence because it is a single case report. While the temporal relationship (bradycardia observed while taking black cohosh and improvement after discontinuation) can raise a safety signal, the design cannot rule out alternative explanations or quantify risk. For adults 60+, the clinical narrative is relevant and may appropriately prompt caution and clinician awareness, but it should not be treated as proof of causation or used to estimate how often this occurs. Stronger evidence would require well-characterized case series, pharmacovigilance analyses, or controlled observational studies with careful adjustment for comorbidities and concomitant medications, plus verification of supplement composition.
Category Breakdown
| Category | Score | Rating |
|---|---|---|
| Study Design / Evidence Level | 2.5/10 | |
| Bias & Methods | 3.0/10 | |
| Statistical Integrity | 1.0/10 | |
| Transparency | 6.5/10 | |
| Conflict of Interest Disclosure | 6.0/10 | |
| Replication / External Validation | 2.0/10 | |
| Relevance to Seniors | 8.5/10 | |
| Journal Quality | 7.0/10 |
Additional Notes
Key limitations for senior-focused decision-making: (1) n=1 and no comparator; (2) potential confounding from age-related conduction disease and other exposures; (3) supplement heterogeneity—product identity, dose, duration, and independent testing for adulterants/contaminants are often missing in case reports; (4) outcomes may be influenced by in-hospital monitoring conditions and medication changes. Best use: hypothesis generation and safety awareness rather than efficacy/risk quantification.
Conditions This Research Covers
These condition pages help connect the paper back to the real-world health concerns it addresses.
Health Condition
Arrhythmia
Arrhythmia is a condition where the heart beats irregularly, which can lead to various health issues. It is more common in older adults and can affect heart function and overall health, potentially causing fatigue, dizziness, or more severe complications. Early detection and management through lifestyle changes are essential to maintain a good quality of life.
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Health Condition
Heart Disease
Heart disease, also known as cardiovascular disease, is a broad term that encompasses a range of conditions affecting the heart and blood vessels. It is a leading cause of death worldwide, particularly among older adults.
4 studies
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Health Condition
Tachycardia
Tachycardia is a condition where the heart beats faster than normal, leading to potential health risks. It is more prevalent in older adults and can result from various factors such as stress, heart disease, or medication side effects. Managing tachycardia is crucial to maintaining heart health and preventing complications.
4 studies
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Health Condition
Bradycardia
Bradycardia is a condition where the heart beats slower than normal, typically fewer than 60 beats per minute. It can affect older adults, leading to fatigue, dizziness, and other complications. While a slow heart rate can be normal for some, in others it may signal a problem that requires medical attention.
3 studies
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Health Condition
Atrial Fibrillation
Atrial fibrillation, often called AFib, is a common heart condition that causes an irregular and often rapid heart rate. It primarily affects older adults, leading to symptoms like fatigue and shortness of breath. Managing AFib is crucial to reduce the risk of stroke and improve quality of life.
2 studies
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Treatments Evaluated in This Research
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