Vitamins and minerals helping stuttering?

Vitamins and minerals helping stuttering? I am going to mention before I ask, I KNOW that vitamins and minerals won’t cure a stutter. I’m more so seeking out vitamins and minerals that maybe HELP or REDUCE the problem. I’ve heard of magnesium helping, L-Theanine, and brain supplements working. What are y’all’s experience with vitamins/minerals/supplements? Any specific one that seemed to help? Thanks for any advice.