Biguerlai Tea

It is unclear, because not many studies have been made that I can find. I know that tea is made from fruit and senna leaves, which are most often used as a laxative. (Thereby help weight loss) as a laxative Senna does not interfere with the effectiveness of contraceptives, but there are herbal remedies (such as St. Johns Wort), which can interfere.

No, the only things that can interfere with other drugs contraceptives. :)