If you're thinking about using nutritional supplements and vitamins to aid in your benzo withdrawal, you're certainly not alone!
Tranquilizing medications act on GABA receptors in your brain, which are basically responsible for slowing down everything from your anxious thoughts to your energy levels. The goal during a withdrawal from these medications is to switch (and gradually taper down from) natural alternative medicines that act on the same receptors.
These alternative medicines are by no means as strong as the medication you're withdrawing from, but they help somewhat during a withdrawal. On the same token, remember to never mix other depressants with your benzodiazepine, even if you are tapering. Mixing depressants is a 1+1=3 scenario, and especially until you know how the below supplements affect you at higher doses and with benzodiazepines, it's not worth risking your life.
Natural medications that act on GABA include Kava Kava and Valerian Root.