If you are one of those people who just can't gain weight, try a weight gainer to add extra calories and protein to your daily diet. Hardgainers that we have talked to were shocked when they finally started to gain muscle fast. Back in the day, weight gainers used to be fairly cheap protein powders loaded with sugar and fat to up the calorie content. The serving size would be something like 300gr. and the serving would contain 3000 calories. Not exactly a practical serving size, and all that sugar kind of went against the idea of eating clean. Plus, the quality of the protein in the gainer was usually poor. Although many gainers like this still remain on the market, fortunately, the supplement industry has come a long way. We have weeded out the best ‘Smart Gainers’ and have the following products to recommend.