It's a bit disappointing that Vitamin D was used as a control, since based on my research, Vitamin D does seem to have very significant effects on mood. Author says:
> Vitamin D might have some effects on mood, but no one seems to claim that they’re acute, that you’d feel them within an hour.
As far as I remember, this is correct, which is to say, I've never read anything that claimed the effects of vitamin D were acute. However, this seems like it still leaves a pretty big gap to me: you're taking a known mood-altering substance and basically hoping that the effects aren't acute because nobody has bothered to test whether they are or not.
That said, this is a minor complaint, and this test is far more scientific than the vast majority of self-experiments.