Originally Posted by Mark in Idaho

Please be careful with the rhodiola. It is a natural form of an MAOI (monoamine oxidase inhibitor). MAOI's are contra-indicated with many other meds commonly taken. The rhodiola likely just elevated your mood but did not improve your concentration.

Self prescribing an MAOI is problematic in my book, just as St John's Wort is the natural form of an SSRI/SNRI. Hemlock is also a natural substance. Don't let 'natural' lull you into a false sense of safety.