Weight gain supplements have come a long way from the original gut bloating, sugary gainers of the 80s. Most modern mass gainers like Reflex Instant Mass and Maximuscle Progain offer the highest quality proteins, sensible amounts of slow digesting carbohydrates and the right amount of calories and nutrients to aid in lean muscle gain whilst minimising the chances of adding bodyfat. These weight gain supplements are what we call 'nutrient dense', meaning that every calorie you are ingesting is worthwhile and not simply 'empty calories'. Two of our most popular weight gainers are Muscletech Mass-Tech and PVL Mutant Mass.