How Does Black Cohosh Work?
It is not clear how exactly black cohosh works. It contains several different active compounds. Because it is most often used for
menopause symptoms, it is thought that the herb's activity is related to estrogen. While black cohosh seems to work like estrogen (it has many actions similar to estrogen), research suggests that it does not bind to estrogen receptors and does not increase the number of estrogen receptors. Therefore, it is not known how or why this supplement has estrogen-like effects.
Many studies have evaluated the effectiveness of black cohosh for treating the symptoms of
menopause, and the results have been mixed. Some studies indicated that it worked well, while other studies suggested that it was no more effective than a placebo (a "sugar pill" that does not contain any active ingredients).
There is not enough evidence to evaluate the effectiveness of this supplement for any other use.
Even though there is little information available about the best way to dose herbal supplements (compared to prescription or non-prescription medications), many studies of black cohosh for treating
menopause symptoms have used similar doses.
Side Effects of Black Cohosh
Many people believe that "natural" products, such as black cohosh, do not have any side effects. However, many natural products cause side effects, some of which can be quite serious. Black cohosh can cause side effects, such as:
- Headaches
- An upset stomach
- Weight gain
- Breast tenderness.
(Click Black Cohosh Side Effects to learn more, including potentially serious side effects that you should report immediately to your healthcare provider.)
In reasonable doses and for short periods of time, black cohosh is probably safe for many people. However, some people may be more likely than others to experience problems. Therefore, you should talk with your healthcare provider before taking this herb if you have:
- Cancer (or a history of cancer)
- Endometriosis
- Uterine fibroids
- Had a kidney transplant
- Liver disease, including liver failure, hepatitis, or cirrhosis
- A blood clotting disorder
- Any allergies, including allergies to foods, dyes, or preservatives.
Also, let your healthcare provider know if you are:
Make sure to tell your healthcare provider about any other medicines you are taking, including prescription and non-prescription medicines, vitamins, and herbal supplements.
(Click Black Cohosh Safety for more information, including any available warnings and precautions.)
What If I Take an Overdose?
It is not known what exactly to expect from an overdose. If you think you may have taken too much, seek immediate medical attention.
Storage Methods for Black Cohosh
Refer to the label of your individual black cohosh product for information on how best to store it. Keep black cohosh and all other medications or supplements out of the reach of children.
