Reddit mentions of NOW Supplements, Niacin (Vitamin B-3) 500 mg, Essential B-Group Vitamin*, Nutritional Health, 100 Capsules

It's pretty common, here is NOW niacin on amazon.

TL;DR: Try adding niacin and lithium orotate, and look into tDCS or even TMS.

I can relate to what you're going through. I've been on Wellbutrin (300mg/daily) for the past 9 years, and I know it helps raise the lower floor of my depression. (I know this because, at the end of a 6-month hiatus to see if it was having any effect, I was worse than my worst days 20 years ago.) But it doesn't seem to do a whole lot more than that for me. I'm also on Vyvanse (40mg) for ADD, which it seems to help, but even though its a stimulant, it doesn't have much of a stimulatory effect on me. (This was true on a prescription for Adderall, as well; often were the times I'd take an Adderal with my morning vitamins and Wellbutrin and just go back to sleep for a few more hours.).

In addition to Wellbutrin and Vyvanse, here's what I've done or am doing that has helped incrementally with each addition. Your mileage may vary:

• B12 (10,000mcg sublingual)
  
• Caffeine (200mg in morning and afternoon)
  
• Garden of Life Mood+ Probiotics
  
• Phenibut (750mg, followed by 500mg 4-8 hours later)^1
  
• Niacin (500mg 4x/day)^2
  
• Lithium Orotate (5mg/day)^3
  
• tDCS: DLPFC F3+ and Supra Orbital Fp2- at 2mA for 20 min^4
  
  ^1 Phenibut: only on days when the barometer is dropping appreciably below mean sea-level atmospheric pressure. I'm serious.
  
  ^2 Niacin: I learned of this one in this subreddit, I think. I titrated up to 2,000mg/day over the course of a week, and I try to take it with food in my stomach. But it has to be the regular niacin that causes the flushing the first week or so until your body is used to it, not the "extended release" or "no-flush" varieties.
  
  ^3 I only recently learned this is available as a mineral supplement. Anecdotally, 5mg is about what you get from lithium occurring naturally in some well-water supplies. My psychiatrist said 5mg isn't even one percent of the amount they give people to stabilize them in a clinical setting, but he also said I was welcome to try it if I wanted. I've only been on this for a week and a half and it may only be helping me sleep, but at least that.
  
  ^4 Transcranial Direct Current Stimulation: Did my research, including lurking on /r/tDCS, ended up getting that SSD model I linked to above. My psychiatrist wants me to look into whether Transcranial Magnetic Stimulation (TMS) would be covered by my insurance (for example, from one of these places), and I said I would, but I first wanted to try this lower-cost, easier-to-implement method of tDCS -- since they are related therapies and target the same neuron areas of the brain, basically. He told me to go ahead and give it a try.
  
  I have to say the last week, with the lithium and the tDCS, has felt mostly different for me. I think it's everything on the list, cumulatively, probably, but it feels especially like it could be the tDCS making the bigger difference, which I've only been doing for a week now. The device could be little more than a "Placebometer 3000," but I know that I tried a lower amperage (1mA) on Sunday and then tried a different montage (placement of electrodes) on Monday, and neither one seemed to be as effective, but today, returning to the initial one I listed above, I feel back on track.

weird.

i trust now foods.

i tried this one:

https://www.amazon.com/dp/B004LVW8TU/

however, i started with their 100mg caps first.

try taking one of those 500mg now foods one, go to the gym, get a little sweaty on the treadmill, and get back with me

)

seriously tho, before that experiment u may want to try a lower dose of that now foods niacin vit b3

cause it burnt like hell and felt like pins and needles and made me itch like crazy

tolerance builds tho.... eventually there may not be a reaction

which is when i start again, i start with the 100mg caps