I have never heard of that for depression. I will certainly look into it. Since I wrote this I have increased my walking, and that has helped to lift some of the depression, but I definitely need something more. I've also never heard of potassium connected with depression. Thank you for letting me know this stuff!
Years ago, I used to take L-Tryptophan when I was low in spirits, along with a b-complex vitamin ( for the b-6) and it worked beautifully. Then they pulled Tryptophan off the market. Is it back on? I did try 5-HTP but it didn't work. I also tried St. John's Wort and it made made me as sick as the anti-depressants did. Over the years I have forgotten about trying natural remedies, probably in disappointment over the ones that didn't work. I got into doing lots of walking and that worked beautifully, until I came down with MS and lost my mobility. Now it's coming back, but I'm still limited.