Catch yourself thinking negative or pessimistic thoughts? Blame your high cortisol levels, influencers would have you believe. Online, cortisol—commonly called the “stress hormone”—is a ...

Mean serum cortisol concentrations did not differ significantly in the three categories of animals during the first venipuncture at 13:15 (P > 0. 1; Table 1). At 13:30, mean cortisol concentration was ...