Optimum Nutrition GS Pro Gainer Weight Gainer Protein Powder, Double Chocolate, 5.09 Pounds (Packaging May Vary)

Customers find this protein powder delicious and effective for weight gain, with many reporting gains of 4.5 pounds of lean muscle. The product receives positive feedback for its quality, with one customer noting it's better than regular protein drinks, and they appreciate how well it mixes with milk. While some customers consider it excellent value for money, others feel it's overpriced. The serving size receives mixed reactions, with several customers finding the scoops too large.