When I’m feeling down, Carlson’s VitD drops are my first goto remedy.
I also found that when I started re-feeding and E4H, my mood picked up a BUNCH. Something about eating foods you like, in sufficient quantities, improving your metabolism and temperatures just made me feel GOOD.
Eating enough good food also made me want to move more (as did 3 minutes in the tanning bed, i.e. VitD) – and getting fresh air, out walking the dog is also a major mood-lifter for me.