No, protein powder alone will not build muscle without working out. 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.

Protein powder can be a helpful addition to your diet as it can provide your body with the amino acids it needs to repair and rebuild muscle tissue, but it is not enough on its own. Consuming protein powder without engaging in strength training exercises will not result in muscle growth.

In conclusion, protein powder can support muscle recovery and growth, but it should not be relied upon as a sole means of building muscle. It is important to engage in strength training exercises and consume a balanced diet that includes adequate amounts of protein, carbohydrates, and healthy fats to support the muscle-building process.