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

Customers praise this protein powder for its high-quality blend, with one noting it's better than any other protein drink, and report gaining 20 pounds of lean muscle mass. The product mixes well in whole milk and water, and customers appreciate its 60g of protein content. While some find it very good for the price, others consider it overpriced. Opinions on stomach sensitivity are mixed, with some finding it easy on their stomach while others report bloating.