Rhonda Patrick talks about vitamin D quite bit (she is awesome). I'm coming up empty on seasonal relationships but it would surprise me if she hasn't mentioned something about it.
It does make sense though. If you're not taking supplements and the sun isn't direct enough to make any on your own until late April then late spring would be the longest point in the year you've gone without proper sunlight.
It does make sense though. If you're not taking supplements and the sun isn't direct enough to make any on your own until late April then late spring would be the longest point in the year you've gone without proper sunlight.