Protein coffee can be a great option as long as it's consumed in moderation and as part of a balanced diet. The protein in protein coffee can help promote satiety and support muscle growth and repair. This can be beneficial for those who exercise regularly. However, consuming excessive amounts of protein can be harmful to the body, particularly for those with kidney disease or other underlying health conditions. As such, it's important to talk to your doctor or a registered dietitian before adding any protein supplements to your diet.