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PMID: 32331820

Studies have shown that long-term treatment with vitamin D promotes GABA synthesis in crucial brain areas such as the prefrontal cortex, anterior cingulate cortex, and hippocampus (Staal et al., 2012)

For instance, selenoproteins S (SELENOS), N (SELENON), M (SELENOM), T (SELENOT), and F (SELENOF, previously known as 15 kDa selenoprotein (Gladyshev et al., 2016) are endoplasmic reticulum-associated proteins, involved in the unfolded protein response (Ye et al., 2005) and, potentially, other less explored functions

You may consider stopping or taking a break after several months, once you achieve your desired results, or if you experience side effects