Yeah, on the one hand I'm strongly against drive-by one liners, on the other hand vitamin D
cured me.
I was already taking magnesium, B6 ... everything else.
8000 to 12000IU of Vitamin D a day for four weeks weeks cured me of my suicidal ideation / depression / emotional instability / irritability.
I went to the doctor and got a prescription for antidepressants a couple of times, drove to the pharmacist and sat in the carpark in my car crying for half an hour before I drove home without getting the medication.
Vitamin D was the keystone that's made all the other supplements work way better.
Now I'm on a much lower maintenance dose, a few hundred IU a day average taken as larger random doses throughout the week.
I guess it makes sense if I think about it, I get almost no sun exposure, and when I am outside I'm covered in long sleep and pants because the sun here in Tasmania is either too low in the sky to warrant shorts and a tshirt, or it's summer and the sun here cooks my pale skin in minutes.
Your millage may vary. Vitamin D and magnesium are considered very non-toxic even at stupendously high dosages for short periods of time. And they're both fairly cheap.
Disclaimer: this does not constitute medical advice, do your own research, and all of that. I'm not insured to give nutritional advice.