Shweta Bachchan Nanda recently shared her beauty secrets and revealed that her parents, veteran actors Amitabh Bachchan and Jaya Bachchan, owe their 'very good skin' to an unexpected ingredient - mustard oil. She explained that while her mother, Jaya Bachchan, uses mustard oil in cooking, particularly for preparing Bengali dishes, her father, Amitabh Bachchan, applies it directly to his skin.