Nerve Regen Formula Stunt Alert Prohibitive Blend 43mg: Feverfew Concentrate, Oat Straw Concentrate, Passionflower Concentrate, Skullcap Concentrate. According to the association, NerveRenew's vitamin B is 3X more bioavailable than the vitamin B contained in other neuropathy supplements, which allows a more noteworthy measure of it to be passed on to your cells where it's required.