Lean Mass Gainer A more measured way to load up throughout the day. This precise mass gain formula has a lower carb content for trainers who want to build muscle mass in a controlled manner. Each 85g serving packs in 338kcal, comprising 34g of protein, 34g of carbohydrate & just 5g of fat. If you want to bulk up, you’ve got to pack in the calories, but some people might want to take a more steady approach. This Lean Mass Gainer formula provides all the protein you need but with a lower Carb content