Herbs have always been the basic source of medication in all the cultures across the world. We find mention of herbs and their uses in history, literature, the Bible as well as several other religious texts.
Usually, herbs have no harmful side effects, but we can’t generalize the statement. Some people may experience slight problems consequent upon their use.
Therefore, when using a new herb, you should try it as a single product, and wait and watch for its effects. If no problem is experienced, you can increase the dosage cautiously.