Adding butter to your coffee can be healthy but to get the health benefits you should use grass fed butter which is butter made from cows that are grass fed and not grain fed.
The grass fed butter that you put into your butter coffee is rich in omega-3s, CLA, beta-carotene, antioxidants, and vitamins A, K, D & E.
These vitamins and nutrients help to boost your immune system, fight off disease, improve mood, remove toxins from your body, boost your energy levels and help aid in digestion and gut health.
Adding grass fed butter to your coffee can also help with weight loss when you drink it in moderation due to the fat burning properties of it.
Just avoid drinking too much butter coffee because it could actually harm your health instead of helping it due to the high saturated fat content that the butter contains.