I'll give you about a hundred studies if you want.
If we’re being honest, I found that large doses of 1-3 grams should be monitored by a doctor but...
“Is it dangerous to take 500 mg of niacin daily?
But niacin (as nicotinic acid) in doses higher than 500 mg daily can cause severe side effects, including liver damage, diabetes, gastritis, and an elevation in blood levels of uric acid (which can cause gout).”
I’m willing to do up to 500mg a day but not 1-3 grams unless advised by my doctor. I have asthma, an irregular heartbeat at times, and low thyroid. I would love to be able to do it but at higher doses than 500mg I want my doctor involved.
I think it’s great if it works for a person without other health issues but I’m cautious with stuff like that.