Can whey protein be harmful in any way and how should i use it?

Whey protein is just another potential food source some use to augment their protein intake. If you are not allergic to the product it will not harm you in general. Many add it to milk or other drink in amounts suggested in the product literature. I find such supplements have little value. If you eat a well balanced diet you get what you need. Protein you eat in excess of need is converted to fat