Studies show testosterone fluctuates seasonally, peaking in the summer months and declining in the winter.
Zornitzki, T. et al. Seasonal Variation of Testosterone Levels in a Large Cohort of Men. Int. J. Endocrinol. 2022, 6093092 (2022).
Parikh, R. et al. Skin exposure to UVB light induces a skin-brain-gonad axis and sexual behavior. Cell Reports 36, 109579 (2021).
02:35 Testosterone levels peak during August and September and decline in winter.
03:30 More sunlight and higher temperature correspond with higher testosterone.
05:15 Changes in melatonin byproducts impact testosterone.
06:05 Physical activity is a potent stimulus of testosterone production.
08:44 Chronic UV exposure, in animal models, increased levels of sex hormones and more sexual responsiveness in humans.
10:10 Tentacle tanning may work, but it needs study.
12:45 Lower disease risk and mortality in men is linked with higher testosterone.
13:00 Low fat diets decrease T in men.
14:40 Zinc, boron, vitamin D, and magnesium impact testosterone.