Is it safe to reuse steamed milk once cooled again?

It is generally not safe to consume leftover steamed milk. Once milk is heated and cooled, it becomes a breeding ground for harmful bacteria. When temperatures reach the appropriate range, bacterial growth can double in as little as 20 minutes. Consuming milk contaminated with bacteria can lead to foodborne illnesses and potential spoilage. If you have remaining steamed milk, it's best to discard it and prepare a fresh serving for your next usage.