Many people start their day with chai, but excessive tea consumption may strain kidneys due to oxalates. Black tea, especially in large quantities, raises kidney stone risk. A rare case highlighted kidney failure from excessive iced tea. While chai with milk might be less risky, moderation is key, especially for those prone to kidney issues.Many people start their day with chai, but excessive tea consumption may strain kidneys due to oxalates. Black tea, especially in large quantities, raises kidney stone risk. A rare case highlighted kidney failure from excessive iced tea. While chai with milk might be less risky, moderation is key, especially for those prone to kidney issues.