Using microwaveable aluminum foil for cooking is generally safe, but it should be done with caution. Aluminum foil can reflect microwaves, which can help in even heating. However, it's crucial not to cover the entire contents of the dish, as this can lead to uneven heating or even cause a fire. Also, avoid using it for acidic or high-sugar foods, as these can react with the foil and potentially release harmful substances. Always follow the manufacturer's guidelines for microwave-safe materials and use microwave-safe aluminum foil to minimize any risks.