^^^ Four to six grams of vitamin C, daily. 
Diarrhea guaranteed!
For the extra cleansing effectzx
Vitamin C is very safe but once you go past 2,000mg it can cause GI upset including diarrhea.
Is it possible to take too much vitamin C?
https://www.mayoclinic.org/healthy-lifestyle/nutrition-and-healthy-eating/expert-answers/vitamin-c/faq-20058030
I take 10g of VC every day, spread throughout the day. No issues.