Yes—protein powder can support weight gain, but the smarter goal is “quality gain.” Weight gain requires a calorie surplus, yet building that surplus with nutrient-dense foods is more effective than relying on sugary, low-quality calories. Protein powder can make it easier to increase protein intake and overall calories, especially for people with low appetite or busy schedules. That said, drinking protein powder alone may not create weight gain if total calories remain too low. If the goal is more muscle, resistance training is essential; otherwise, much of the gained weight may be body fat. A practical method is to combine protein powder with milk, oats, nut butter, or fruit to create a higher-calorie shake with better nutrient value, distributed across the day. Monitor sugar content and digestive tolerance. The target is not just body weight—it is body composition: more muscle with controlled fat gain.