Sunlight & Testosterone: Why Levels Should Peak in the Summer

by Mike Mutzel


Studies show testosterone fluctuates seasonally, peaking in the summer months and declining in the winter.



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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).

Key Takeaways:

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.


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