I had the same thought.... here’s the reason I didn’t do it, the fast is also a detox and if you put pills in your system it may be harder for your body to detox. Now that being said, I am a huge fan of Kratom which is not a hunger suppression but a mood lifter. There have been times when I have been in a bad mood and used Kratom to help pull me out of it. However unlike most diet pills, Kratom is an herb made from a leaf and can be made into a tea.