Both of these herbs are psychoactive and effect each person differently.  Salvia is used by people sometimes as a substitute for cannabis, and they say that they can reach a meditative state, while using Salvia.   Other people say that they do not like the effects of Salvia, and stop taking it after only one try.  I will give you a link to a web site where in the second post, the person gives some excellent advice.  Kratom is an opiate and it comes in a power.  You do not know how these powders have been manufactured because these “medicinal” herbs are not tested by any standards, such as the FDA would do.  Therefore, you do not know what you might be ingesting.  Opiates are addictive.  All herbs and combinations of herbs can lead to big problems, if they are not fully investigated.  It might be a good idea to consult a trusted expert from your local health food store, or better yet, get a good guide at the book store, or online at amazon.com or barnes&noble.com to learn more about these herbs and their effects on the body and nervous system or brain. http://answers.yahoo.com/question/index?qid=20071025153726AAr7TfS