Sultanas are generally good for you and offer several health benefits. They are rich in natural fiber, antioxidants (polyphenols), and minerals like potassium, iron, and boron. Sultanas help promote fullness, support healthy bowel function, regulate blood sugar levels due to their low glycemic index, and contribute to heart and bone health. They may also aid in weight management and provide energy through natural sugars. However, it's best if they have no added sugar for optimal health benefits.