✔ 最佳答案
Protein shakes are simply drinks that contain proteins dissolved in water. You can actually take in more proteins by eating beef, pork, chicken or fish in their solid forms, or by drinking milk or soy milk. Beans and peas are also a good source of proteins. The efficacy of protein shakes has been oversold by their manufacturers who are out there to make money. Yes, you will gain muscles without drinking protein shakes at all. Your muscles will firm up within days, and you will notice a difference within weeks.
參考: Personal experience.