Approximately two hours of daily skin exposure to sunlight on the upper body, arms, neck, and face can lead to significant increases in testosterone and estrogen.

“Light exposure to the skin, turns out about two hours a day, this was sunlight, in this case, to the upper body, these people weren't naked, they were wearing clothes but their arms were exposed, their upper back and neck and face were exposed, they were not wearing hats, resulted in large increases, significant increases in testosterone and estrogen.”

“They had people receive a dose of UVB light exposure that was about 20 to 30 minutes outdoors. They had people wear short sleeves, no hat, no sunglasses. Some people wore sleeveless shirts. They encouraged people to wear shorts. So they were indeed wearing clothing. They were not naked. And they were wearing clothing that was culturally and situationally appropriate, at least for the part of the world where this study was done. And they had people do that two or three times a week.”

“So in terms of thinking about a protocol to increase testosterone and estrogen, mood and feelings of passion, the idea is that you would want to get these two to three exposures per week, minimum of 20 to 30 minutes of sunlight exposure onto as much of your body as you can reasonably expose it to.”

“getting light onto as much of our skin as we can throughout the day can really help in the production of testosterone and estrogen in both men and women in healthy ways that improves mood and libido and all sorts of things that are associated with wellbeing.”

“So in terms of thinking about a protocol to increase testosterone and estrogen, mood and feelings of passion, the idea is that you would want to get this two to three exposures per week minimum of 20 to 30 minutes of sunlight exposure onto as much of your body as you can reasonably expose it to.”