Maxi nutrition progain extreme straw 1500g when youre training hard for mass and size add progain extreme to your diet the additional calories and 40g of protein will help to maximise gains in muscle mass and size new formula 40g of high quality protein 600 calories per serving naturally rich in bcaas glutamine screened for banned substances take your mass and size goals to the next level by using progain extreme training to further increase mass and size requires the right nutrition inc