DSC and TG studies were carried out on γ-radiation processed Indian natural products of medicina importance, namely Ashwagandha (Withania somnifera), Amla (Emblica officinalis) and Hartiki (Terminalia chebula). DSC thermoanalytical curves were recorded from 35 to 400^oC in air and nitrogen atmosphere. Similarly, TG thermoanalytical curves were taken from 35 to 700^oC in air and nitrogen atmosphere. Irradiated products gave significantly different thermoanalytical profiles in comparison to non-irradiated samples. The differences were observed above decomposition temperature of 200^oC and were non-linear with respect to radiation dose. Partial oxidation of the products during irradiation in air could be responsible for the observed differences.