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I recenty listened to an Andrew Huberman podcast, where he mentioned sunlight exposure (especially in the morning) as beeing very good for your hormonal state.
I found this study in his podcast notes.
They irradiated mice with UVB light, that was equivalent to about 20-25 minutes of midday sun...
This is one of these good, old studies from the 30ies.
They applied light to different body parts of depressed individuals and measured androsterone output afterwards.
The light contained UV- and infrared light, similarly to sunlight:
"...the spectrum of this lamp consists of 52% infrared...
Full study here --> http://www.jimmunol.org/content/179/6/3604.full
"UVB damage affects many cellular compartments and components. Here we identified taurine as a novel endogenous factor in protection against photoimmunosuppression. This novel UVB defense mechanism complements the well-studied...