Can niacin cleanse your system of weed?

Drink a lot of water morning of. Take niacin following directions on bottle. too much then skin feels like a sunburn. Niacin and a lot of water (32oz) with a small amount of Apple cider vinegar. Then drink a coke for impurities. These are 2 different methods mixed. Some say just the Apple cider vinegar alone. The full treatment has worked for me many times. Unless it goes to a lab. Then S.O.L from my experience. GOOD LUCK