Kadukkai is a fruit of tree which grows in all climate conditions of India. These fruits are collected, dried well, deseeded their kernels and the flushy fruit part only ground into very fine powder. It is then filtered to make it free from unground particles. It is necessary to remove its kernels before using it. 

It is called as Inknut or Chebulic in English, Haritaki or Harad in Hindi. Its Botanica Name is Terminalia Chebula.

Disclaimer: Before taking any herbal as an intake, you are requested to consult with a Siddha or Ayurveda Doctor or any other Traditional Siddha Physician to avoid further health related problems. They will help you to understand the procedure, the effect of Herbals and foods to avoid if any, upon consuming the herbs.