Black Hellebore (Helleborus niger) has a long history of use in traditional European herbal medicine, where it was sometimes employed for various gynecological conditions, including menstrual irregularity. Historical texts from ancient Greece and later European herbalists occasionally mention hellebore as an emmenagogue, a substance believed to stimulate menstrual flow. However, its use was often accompanied by warnings about its toxicity and potential for severe side effects such as vomiting, diarrhea, and even cardiac issues.

There is little to no robust scientific research supporting the efficacy or safety of Black Hellebore for menstrual irregularities. Modern phytotherapy does not recommend its use for this purpose due to the high risk of poisoning and the availability of safer alternatives. The evidence supporting its use is thus almost entirely historical and anecdotal, with references found in pre-modern herbal manuals rather than in controlled clinical studies.

In summary, while Black Hellebore has a traditional reputation for supporting menstrual function, this use is based on historical practice rather than scientific validation, and the associated risks make it obsolete in contemporary herbal medicine.