There are many types of protein powders on the market and some can be high in carbs. Low-carb protein powders include whey, collagen, casein, and egg (among a few others). To be sure you’re purchasing a low carb or keto protein powder, it’s best to look for keto-friendly brands and check the net carbs in the ingredients. Lower carb and keto protein powders typically range from 0 to 5 net carbs per serving.