P.husk: Psyllium is a bulk-forming laxative. This means it soaks up water in your gut and makes bowel movements much easier and can help promote regularity without increasing flatulence.
Research paper: https://globalresearchonline.net/journalcontents/v18-1/08.pdf
T.Ammi: It can increase the secretion of gastric acid, bile acids and activity of digestive enzymes.
Research paper: http://www.informaticsjournals.com/index.php/jnr/article/view/96#:~:text=Ajwain%20seeds%20revealed%20to%20possess,remarked%20by%20early%20Persian%20physicians.
Taking senna orally is effective for short term treatment of constipation. Senna is an FDA-approved nonprescription drug for
adults and children ages 2 years and older. However, in children ages 3-15 years, mineral oil and a medication called lactulose might be more effective. In elderly people, senna plus psyllium is more effective than lactulose for treating ongoing constipation.
Research Paper: https://www.plantsjournal.com/archives/?year=2013&vol=1&issue=3&part=A&ArticleId=19