http://www.health4welness.com/xl-real-muscle-gainer/
XL Real Muscle Gainer
Mass Gainer consists of an average of 75-85% carbohydrates, 15-20% proteins and 4-5 % fats typically taken to boost muscle gain, however, content can vary from brand to brand. Mass gainers are suitable for lean or underweight people who want to gain bulk, provided that they follow a heavy workout schedule.