Reflex nutrition instant mass heavyweight is a high calorie lean mass gainer designed for anyone wanting to add calories to their dietr reflex nutrition instant mass heavyweight provides an impressive 1 160 calories 60g protein and 219g carbohydrates per serving and is packed with added vitamins and minerals to promote further health benefitsr this unique and powerful mass gain shake formula is perfect for those seeking a high quality source of protein and premium complex carbohydratesr t