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Definitely worth checking out. I went from 20ng/ml to 50ng/ml within a year and noticed some mood stability and energy increases. Your mileage may vary.

For what it is worth, I live in Texas and get plenty of sun each day(30+ minutes) but for some reason not enough showing on blood work.

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It’s possible you’re not getting enough precursors to allow for sunlight to greatly increase vitamin D production. How much fat do you eat in a day? Skin tone is an additional factor as well.

Also, an aside, it’s humorous to me that you describe 30+ minutes a day as “plenty of sun”. By todays standards, definitely. But the natural state of humankind is “however many minutes there is sun” worth of sun per day.

Caves and trees and other natural shelter were presumably available and used by the 'natural' humans, and clothing/constructed shelter was a thing after not too long as well. So it's not like we were in the sun literally all day bud.

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