Probably due to the D25 drop: https://www.sciencedaily.com/releases/2012/02/120223103920.htm
also...
Winter to summer change in vitamin D status reduces systemic inflammation and bioenergetic activity of human peripheral blood mononuclear cells:
https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5406546/
^ Various inflammatory markers were measured in winter compared to summer.
(https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5406546/table/t0010/)
Post Edited (Dmitry) : 10/17/2019 4:11:56 AM (GMT-6)