Rhonda Patrick talks about vitamin D quite bit (she is awesome). I&#x27;m coming up empty on seasonal relationships but it would surprise me if she hasn&#x27;t mentioned something about it.<p>It does make sense though. If you&#x27;re not taking supplements and the sun isn&#x27;t direct enough to make any on your own until late April then late spring would be the longest point in the year you&#x27;ve gone without proper sunlight.