An even smaller number of plants and their extracts have been studied so thoroughly that information is available on their safety and efficacy.
وعدد اصغر ايضا من النباتات وخلاصاتها أُجريت عليه دراسات شاملة من اجل معرفة مدى فعاليته والتأكد من عدم تشكيله ايّ خطر .‏