I started taking niacin for anxiety, and to my surprise my skin cleared up quite quickly! (I didn't notice an effect on anxiety). You can purchase niacin in "non-flush " formats, but it's the flush that works to heal acne (I've tried both kinds). I think the tablets are 250 mg, I take half a tablet a day. After awhile you may notice the flush isn't as pronounced because you kind of get used to it, but if you take the niacin with coffee or with a tsp or two of apple cider vinegar, it make the flush more pronounced. The flush is rather uncomfortable - for me it's a prickly, itchy, hot sensation - but it goes away after about half an hour. You also look very red (although I have pale skin) so you might want to time it so the flush is gone by the time you need to go out! Good luck!