Priya Nath gives Shri Nathji ‘Threptin’ Biscuits, and Sanatogen protein powder for more vitality and strength. Shri Nathji has been taking Sanatogen since the days of his youth and calls it an “excellent brain tonic, used even by judges and intellectuals.”“Mujhe do main banaataa hoon! And there he would be, adding a teaspoonful of the powder to a glass and then adding water gradually, stirring the mixture with a spoon all the time, until it became a fine paste and then a fine suspension. Priya Nath could never forget those cold days in Mussoorie in the 1950’s when Shri Nathji would put on his reading spectacles and make the Sanatogen concoction ever so carefully, like a scientist in his laboratory.