Vitamin D
I get it from the sun, right?
Most people do not get enough sun exposure in the 21st century. Because of this, many people are deficient in vitamin D.
Made for you
The vitamin D receptor is found in 900 genes in the human body, an appreciable part of the human genome. The brain is filled with vitamin D receptors and proteins that are turned on by vitamin D.
The good stuff
Proper vitamin D levels may boost mood (1), support immunity (2, 3), and build healthy bones (4).
References:
(1) Vitamin D and the Immune System, J Investig Med. 2011 August ; 59(6): 881–886.
(2) 1,25-Dihydroxyvitamin D3 Restrains CD4+ T Cell Priming Ability of CD11c+ Dendritic Cells by Upregulating Expression of CD31, Front. Immunol., 28 March 2019.
(3) Vitamin D and Depression in Women: A Mini-review, Mohamed Said Boulkrane, Julia Fedotova*, Valentina Kolodyaznaya, Vincenzo Micale, Filippo Drago, Annemieke Johanna Maria van den Tol, Denis Baranenko, Current Neuropharmacology, Volume 18 , Issue 4 , 2020.
(4) Vitamin D and Bone, Curr Osteoporos Rep. 2012 June ; 10(2): 151–159.