The mantra for digestion in Hindu religion is dedicated to Dhanvantari form of Mahavishnu. The person wishing to chant the mantra should do at least 12 hour fasting before chanting the mantra. The person should have his last meal before sunset and should only eat 1.5 hours after sunrise next day morning.
The mantra should be chanted after sunset and during early morning hours.
Mantra For Digestion
Om Dhanwantare Namo Shiva Sakshathkaraya
ॐ धन्वन्तरे नमो शिवा साक्षातकराये
Om Dhanwantare Namo Shiva Sakshathkaraya
ॐ धन्वन्तरे नमो शिवा साक्षातकराये
The person chanting the mantra should eat a banana and a small piece of jaggery on all days.