@media only screen and (max-width: 400px) { .desk {display: none;} } @media only screen and (min-width: 401px) { .mob {display: none;} } Muscle Growth Factor (MGF-1) is a high protein shake. Contains 11.5 grams of BCAA (leucine, isoleucine and valine) per serving. @media only screen and (max-width: 400px) { .desk {display: none;} } @media only screen and (min-width: 401px) { .mob {display: none;} } Muscle Growth Factor (MGF-1) is a high protein shake. Contains 11.5 grams of BCAA (leucine, isoleucine and valine) per serving.