Can I take Bupleurum during my menstrual period?
Generally speaking, women can take Bupleurum (Chai Hu) during their menstrual period, but should consume it in moderation. The detailed explanation is as follows:

If women experience symptoms such as liver qi stagnation, emotional depression, chest and rib distension pain during menstruation, and are diagnosed by TCM as having liver qi stagnation, taking an appropriate amount of Bupleurum under the guidance of a TCM practitioner may help to soothe the liver, relieve depression, regulate qi and blood, and alleviate related symptoms, which is beneficial to health. However, caution should be exercised for those with heavy menstrual bleeding or a cold body constitution.
Bupleurum has a dispersing nature that may affect coagulation function and increase menstrual flow. Alone, it may worsen cold-related symptoms such as cold hands and feet and dysmenorrhea. Individuals with these conditions should use it only strictly according to medical advice and should combine it with warming and cold-dispelling herbs. Those allergic to Bupleurum should avoid it, and pregnant women should not use it. Allergic reactions may include rashes and itching, and using it during pregnancy may affect fetal health; these groups should completely avoid contact.
Medication during menstruation should follow medical advice to adjust dosages and avoid mixing with Western medicine. If menstrual prolongation, dizziness, or worsening abdominal pain occurs after taking the medication, discontinue use immediately and seek medical attention. Mild liver qi stagnation may be managed with mild qi-regulating herbal teas such as rose petals and tangerine peel. Additionally, women should keep warm during menstruation, avoid consuming cold, spicy, or irritating foods, and maintain good lifestyle habits to support overall health.