A study looked at aflatoxins in medicinal herbs and their granules. They found a method to detect aflatoxins in eight types of herbs. Some batches of Arecae semen had high levels of aflatoxins. When herbs were contaminated with mold, aflatoxins were found in all samples, with aflatoxin B1 being the most common. The transfer rate of aflatoxins from herbs to granules was around 40%, showing that making granules reduced aflatoxin levels. This suggests that caution is needed when using herbs contaminated with mold.