GSN BIG MASS Gainer is a shake specially designed for weight gain and muscle building. It combines carbohydrates and amino acids to promote muscle growth. Enriched with creatine, it provides 3g of pure creatine per day. Thanks to its formula containing more than 80% whey protein, it helps preserve and develop muscle mass. Its high-calorie formula, delivering 1,351 calories per day, helps you consume more calories easily
