Take half a pill of Iodoral (a full pill is 50 mg). A single 12.5 mg Iodoral should also do the job.
Take it after a meal and write down the time and date.
The next bowel movement with the Iodine in it will be probably type 4 or 5 on the Bristol stool chart and it will burn like chilli on your anus.
Write down the date and time and calculate how many hours it took.
You shouldn't do it if you have an anal fissure or hemorrhoids as this would burn like hell.
J Pediatr Surg. 2004 Feb;39(2):166-9; discussion 166-9.
Colonic transit time--what is normal?Wagener S, Shankar KR, Turnock RR, Lamont GL, Baillie CT.
https://www.ncbi.nlm...pubmed/14966733
J Neurogastroenterol Motil. 2012 Jan; 18(1): 64–69.
Colon Transit Time According to Physical Activity Level in AdultsBong Kil Song, Kang Ok Cho, Yunju Jo, Jung Woo Oh, and Yeon Soo Kim
https://www.ncbi.nlm...les/PMC3271256/