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Promass weight gainer is a natural herbal extract that helps you gain weight naturally. The weight gainer product increases your food consumption levels by increasing your appetite, making you want to eat more food. In addition to this, most people, who want to gain weight still struggle to do so as they have a fast metabolism. Promass weight gainer decreases your metabolic rate and helps your body digest the food that you have eaten and use the nutrition from that food in the most effective way.