No, you cannot build muscle with just protein powder. Building muscle requires a combination of strength training exercises that challenge your muscles and promote muscle growth, as well as adequate calorie and protein intake to support the muscle-building process.
While protein powder can provide your body with the amino acids it needs to repair and rebuild muscle tissue, it is not enough on its own to promote muscle growth. You also need to consume enough calories to support the muscle-building process, as well as engage in strength training exercises that challenge your muscles.
In conclusion, while protein powder can be a helpful addition to your diet for muscle recovery and growth, it should not be relied upon as the sole means of building muscle. It is important to engage in strength training exercises, consume a balanced diet that includes adequate amounts of protein, carbohydrates, and healthy fats, and consult with a healthcare professional or registered dietitian to determine the right nutrition plan for your specific needs.