Depression
"I have been on every ssri and different anti-dep the last 15 years. I started Niacin 8 weeks ago. I am now on 1,5 g. Going up to 3 g. Niacin is wonderful. Has helped me so much. Quite amazing. :) Seriously recommend this. 
Really strange that this is not more known.
Use Niacin only after food. I take the 1.5g after work. 3x500mg. Going to start 1.5g Niacinamide during morning/day-time because it doesnt make you flush. Niacinaminde also work for depression, but not the cholesterol. 
Probably going over to only Niacinaminde after the Niacin is empty.
I live in the winter-darkness of Norway, so I also take vitamin-d."