The protein content in your Greek yogurt will reflect the nutritional profile of the milk you use. Traditionally, Greek yogurt was made with a specific combination of bacteria that imparted its unique flavor. When it gained popularity, it became synonymous with strained yogurt. When you compare 100g of strained yogurt to 100g of unstrained yogurt, the strained version will have more protein due to the removal of whey. This is why Greek yogurt is often touted for its high protein content.