Below are links to studies showing that vitamins in the B Complex help relieve anxiety and depression.
References:
Dietary intake of B vitamins and their association with depression, anxiety, and stress symptoms: A cross-sectional, population-based survey
https://pubmed.ncbi.nlm.nih.gov/33848753/
The Role of Vitamins and Minerals in Psychiatry
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3046018/
Thiamine and benfotiamine: Focus on their therapeutic potential